Dissertation/Thèse
2024
Thèses
1
  • PATRÍCIA AVELAR RIBEIRO
  • DEVELOPMENT OF NANOSENSORS FOR DETERMINING LIPIDS IN BOVINE MILK

  • Leader : IGOR JOSE BOGGIONE SANTOS
  • MEMBRES DE LA BANQUE :
  • EDSON ROMANO NUCCI
  • IGOR JOSE BOGGIONE SANTOS
  • THOMÁS VALENTE DE OLIVEIRA
  • Data: 12 janv. 2024


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  • Milk is a highly nutritious biofluid, widely consumed in the world, capable of meeting the basic needs of individuals. Brazil ranks third in world production of bovine milk. The composition of milk, in particular the fat content, is an essential factor for the final quality of products, in addition to significantly affecting prices for producers. Dairy fats are composed of fatty acids, especially palmitic acid (C:16) and oleic acid (C:18:1), which are responsible for the rheological and organoleptic characteristics of milk and its by-products. Therefore, the quantification of fat in bovine milk is extremely important for the dairy industry, and currently the Gerber method is the most used, however they have a large margin of error and are dangerous. We present a colorimetric methodology for the interaction of gold nanoparticles and 10,12-pentacosadiinoic acid with palmitic acid and oleic acid. The technique was validated by UV-Vis spectroscopy and the RGB color methodology, showing excellent results, in which it was possible to verify the color change of the samples as the concentration of fatty acid increased. This is a promising study for the production of sensitive, low-cost and selective colorimetric nanosensors of dairy fat.

2
  • MATHEUS HENRIQUE ALCÂNTARA DE LIMA CARDOZO
  • Statistical study of the influence and significance of parameters operational effects on the performance of microbial energy cells

  • Leader : EDSON ROMANO NUCCI
  • MEMBRES DE LA BANQUE :
  • EDSON ROMANO NUCCI
  • BOUTROS SARROUH
  • DEMIAN PATRICK FABIANO
  • ISABEL CRISTINA BRAGA RODRIGUES
  • ANDRE AGUIAR MENDES
  • Data: 15 févr. 2024


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  • Microbial energy cells (CEM) are a technology of interest in the current scenario, as they simultaneously enable the biotreatment of waste and the biogeneration of electrical energy.In order to optimize EMF applications, there is interest in investigating the variables that most significantly affect their performance, since these devices are complex systems.Within the scope of this discussion, this work aimed to employ fuzzy logic combined with the experimental planning technique to statistically evaluate how the operating parameters of microbial energy cells influence their performance.Through a bibliographical survey based on publications in the area on the Google Scholar platform over the last 10 years, it was noticed that the variables anode area, external electrical resistance and device volume are the most reported input parameters in research with EMF andthat current density and power density generated are the output parameters most frequently portrayed in these studies, which is why these were the variables selected for statistical investigation.By applying computational simulations and subsequent experimental planning, it was noted that, for both outputs studied, device volume and anode area showed a positive effect, while the external electrical resistance variable showed a negative effect.It was also possible to develop mathematical models that indicated the relationship between each of the input variables and the outputs studied, with statistical significance for the model referring to power density (R2 = 86%).For the laboratory stage, a duplicate test was conducted for 30 days with daily measurement of the potential difference generated in the EMF, from which real power density data were calculated.The comparison of power density obtained in laboratory experiments (818.39 mV/m2) showed a good fit in relation to the prediction made using the mathematical model developed for power density (818.36 mV/m2).

2023
Thèses
1
  • Welberth Santos Laizo
  • SYNTHESIS OF A COMPOUND BASED ON CARBON AND ALUMINUM OXIDE, ITS CHARACTERIZATION AND APPLICATION IN CONGO RED ADSORPTION TEST IN AQUEOUS SOLUTION

     
  • Leader : ALEXANDRE BOSCARO FRANCA
  • MEMBRES DE LA BANQUE :
  • ALEXANDRE BOSCARO FRANCA
  • JORGE DAVID ALGUIAR BELLIDO
  • LUCAS MEILI
  • PATRICIA DA LUZ MESQUITA
  • Data: 26 avr. 2023


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  • Charcoal and alumina are compounds widely used in industry, as adsorbents and catalyst supports, and can act alone or together with other compounds and molecules. Seeking to combine the adsorbent capacities of these two materials, the impregnation of aluminum (Al2O3) was proposed, by sol-gel process, inside a carbonaceous matrix, aiming to promote an increase in the removal of organic contaminants in the aqueous phase in synthetic effluents, compared to what the components separately can provide. The methodology employed began with the production of an adsorbent based on elephant grass charcoaling. This was treated with a colloidal solution containing aluminum Tri-sec-butoxide (C12H27AlO3), which was gelled with water vapor, and subsequently thermally treated, obtaining as a final mixed product, charcoal/aluminum. The adsorbent was then characterized for the presence of crystalline phases (X-Ray Diffraction), morphology (Scanning Electron Microscopy), specific area and porosity (multipoint method) and thermal stability (Thermogravimetry). It was possible to identify aluminum in its boehmite form, the increase in specific area (14.42%) and porosity (17.03%), in relation to the initial coal, as well as a range of thermal stability that was close to 500°C, in addition, the presence of aluminum in the pores was present in the microscopy analyses, as well as its dispersion over a large part of the surface of the samples.
    The production and impregnation process, therefore, proved to be effective for what was proposed, and it is now necessary to verify its use as an adsorbent.

2
  • Juliana Abreu de Freitas
  • Evaluation of water cyanide removal processes from water ore processing for industrial scale application

     

     


  • Leader : JORGE DAVID ALGUIAR BELLIDO
  • MEMBRES DE LA BANQUE :
  • JORGE DAVID ALGUIAR BELLIDO
  • JACKSON DE OLIVEIRA PEREIRA
  • JOSY ANTEVELI OSAJIMA FURTINI
  • Data: 23 mai 2023


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  • Gold ore extraction process goes through different steps, from mineral research to physicalchemical processing steps, which use chemical reagents for extraction, such as cyanide. This
    work aims to evaluate the removal of cyanide in the effluent generated after the gold ore
    beneficiation process, seeking to integrate the conceptual part of the literature with bench tests
    and industrial application, with optimization of results. Chemical treatment routes were studied
    by oxidation using hydrogen peroxide and the Fenton process and by adsorption on activated
    carbon in batches in a Jar Test apparatus. The oxidation processes were then scaled up to an
    industrial scale. It was proven that these processes are capable of removing cyanide at the levels
    required for recirculation of the effluent in the process, 1,0 mg/L of free cyanide and 30,0 mg/L
    of total cyanide, reaching removal of 89% (± 2) of free cyanide and 90 % (± 3) of total cyanide.
    A statistical study was then carried out using a DOE tool to evaluate the interaction between
    the dosages of hydrogen peroxide and ferrous chloride at different pH values, in order to
    optimize the dosage to reduce the operational costs of this decontamination process. The results
    indicated that it is possible to remove cyanide in sufficient quantity to reuse the effluent (higher
    than 96% of removal), using 88% less hydrogen peroxide and 70% less ferrous chloride,
    working at pH 3, resulting in lower operating expenses for effluent treatment.


3
  • Deborah Vieira Miranda
  • SYNTHESIS OF POLYURETHANE FOAMS FROM VEGETABLE OILS FOR APPLICATION AS ADSORBENT SNOWPHARDS CONTAINING DRUG AS CONTAMINANT

  • Leader : CRISTIANE MEDINA FINZI QUINTAO
  • MEMBRES DE LA BANQUE :
  • CRISTIANE MEDINA FINZI QUINTAO
  • RENATA CAROLINA ZANETTI LOFRANO
  • KÁTIA MONTEIRO NOVACK
  • Data: 14 août 2023


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  • Polyurethanes (PU's) are a varied class of polymers whose applications can occurin several industrial segments (LIMA, 2007). Pu's can be obtained by reusing diisocyanato with a polyol, usually of petrochemical origin (COSTA, 2007). In literature studies are presented related to the production of polymers from renewable sources, in substitution of petroleum-based raw materials and which generate environmental impacts (FERRARO, 2017).

    The use of vegetable oils for polyol synthesis is a strong attraction in the chemical products because they represent abundant raw materials, mostly nontoxic, lower production waste during the processing phase, low production and processing cost and be biodegradable (COSTA, 2007).

    Polyurethanes can be used in the form of flexible foams, which commonly open cells, being air-permeable, reversible to deformation, and can be produced in a wide range of properties including softness, firmness and resilience (ACCIOLY, 2008).

     

    Flexible foams are common materials and have adsorbent characteristics, and can be be used in different applications such as the adsorption of herbicides and dyes in water (VINHAL, 2017; KAMPRAD; GOSS, 2007).
    Adsorption is a physical-chemical phenomenon of adhering, essentially surface, being observed when a liquid or gaseous phase component is transferred to the surface of a (NUNES, 2014). 

    This phenomenon is a potentially versatile and for the removal of toxic substances from aqueous sources and for the treatment of various types of effluents, such as effluents rich in pharmaceutical compounds (MARSALEK, 2020). Drugs of various classes have been found in hospital effluents and ETEs, in groundwater and potable water at varying concentrations (HARO, 2017).

    The removal of these pharmaceutical substances from the environment is necessary because the high consumption of associated with incorrect disposal, has irreversible impacts such as, in the face of for example, bacterial resistance. (HARO, 2017). The adsorption process stands out in this context for being is a widely studied and promising possibility for the removal of these substances from aquatic sources (MARSALEK, 2020).

    This project aims to study the adsorptive capacity of paracetamol in solution polyurethane foams produced from three distinct vegetable oils. The foams will be produced by the in shot mechanism structurally characterized and submitted to experiments of adsorption assisted by statistical techniques of design of experiments (DOE).

4
  • DANIELA MARQUES PEREIRA
  • Polyethylene terephthalate cast composite polymers with amphibolite as filler

     
  • Leader : CRISTIANE MEDINA FINZI QUINTAO
  • MEMBRES DE LA BANQUE :
  • CRISTIANE MEDINA FINZI QUINTAO
  • RENATA CAROLINA ZANETTI LOFRANO
  • EDUARDO PRADO BASTON
  • MATEUS DE SOUZA AMARAL
  • Data: 5 sept. 2023


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  • The increasing generation of waste inherent in the maintenance of modern life leads to the search for sustainable alternatives that mitiguate its environmental impacts. Coming to meet this ecological appeal, composites produced with reuse material were developed in this work. Polymeric plates were made in different mass proportions in a prototype reactor by mixing PET, glycerin and amphegolasty, a mining residue. With the materials developed, its mechanical strengths were tested in order to define the best proportion of polymer matrix and the reinforcement that allows to be used as wood in the construction sector. 

     
5
  • ANDERSEN ESCOBAR SCHLOGL
  • Scaling up the production of a guar gum coating with ZnO nanostructure for post-harvest fruit preservation.

  • Leader : IGOR JOSE BOGGIONE SANTOS
  • MEMBRES DE LA BANQUE :
  • IGOR JOSE BOGGIONE SANTOS
  • ALEXANDRE BOSCARO FRANCA
  • EDSON ROMANO NUCCI
  • THIAGO FERREIRA QUILICE
  • Data: 18 déc. 2023


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  • NanoFood, Technology in Food Products, is a startup that produces biodegradable coatings with
    nanostructures to increase the shelf-life of fruit post-harvest, it contains two products in its
    portfolio: coating with nanostructure of zinc oxide (ZnO) and coating with nanostructure of
    chitosan. The technological scale-up process on a laboratory scale progressed from TRL 3 to 6,
    formulating a more robust prototype. The nanostructure production process generated a ZnO
    nanostructure measuring 347.7 ± 177.34 nm with a PDI of 1 ± 0 and a chitosan nanodispersion
    measuring 35.93 ± 4.62 nm. The papayas coated with the prototypes had a lower loss of mass
    compared to the control, 11.56% and 10.25% respectively. In the UGBP company, the papayas
    had a mass loss of 10.77 ± 1.41 % for zinc oxide and 10.62 ± 2.58 % for chitosan. The papayas
    coated with the prototypes showed a lower rate of contamination by phytopathogens and smaller
    wounds compared to the control papayas. The technological scale-up process on a pilot scale
    progressed from TRL 6 to 8. The investment for the complete implementation of the pilot plant
    amounted to R$ 113252.476. The zinc oxide (ZnO) nanostructure produced in the pilot plant using
    the unit operations had a hydrodynamic size of 312.05 ± 82.66 nm and the synthesized chitosan
    nanostructure 45.28 ± 10.78 nm.

6
  • JÉSSICA CAROLAINE VIEIRA DE AZEVEDO
  • Boron removal from synthetic sample by adsorption on graphene oxide

  • Leader : FABIANO LUIZ NAVES
  • MEMBRES DE LA BANQUE :
  • FABIANO LUIZ NAVES
  • ALEXANDRE BOSCARO FRANCA
  • SERGIO FRANCISCO DE AQUINO
  • Data: 20 déc. 2023


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  • The numerous oxidation states of the element boron bring great challenges in containing its contamination in receptor bodies. Over the years this scenario increases significantly in recent years due to the widespread use of boron compounds in various industries. For this reason, the removal of this contaminant is receiving worldwide attention. Although adsorption is a promising method to solve this problem, finding suitable adsorbents with cost of application and recovery and at the same time efficient in boron removal, still remains a constant challenge. Thus, this work had as main objective to evaluate the applicability of pure graphene oxide and modified with calcium chloride as adsorbent in the removal of boron from diluted aqueous solutions in a batch system. Batch adsorption sweep tests were carried out to remove boron using malt bagasse, malt bagasse carbon, calcium alginate, calcium alginate impregnated with muse flower, graphene oxide and graphene oxide impregnated with calcium chloride. The adsorbent that showed the best results in terms of removal percentages and adsorptive capacity was graphene oxide. It was observed that the adsorption process of boron in GO can occur in a wide range of pH, which is advantageous at an industrial level due to the variations of its real effluents. At pH 2.5 the percentage of boron removal and adsorptive capacity was 80% 3.43 mg.g-1 and at pH 8.5 it was 90% and 3.96 mg.g-1, respectively. Subsequently, tests will be carried out through a planning of experiments, using the rotational central composite design (DCCR) method, seeking to find the effects of pH, adsorbent granulometry, agitation time, initial concentration of boron and solid/liquid ratio on the adsorption capacity of boron. The adsorption tests to obtain the isotherms will be performed by evaluating different solid/liquid ratios (5.0; 10.0; 25.0; 50.0; 75.0; 100.0; 150.0; and 200 .0 g of graphene/kg of effluent) and carried out in a shaker incubator, at 25.0±0.1 °C and 150±1 rpm, for the equilibrium time determined in the kinetic studies. As for the tests to determine the adsorption kinetics, thermodynamics and equilibrium time, they will be performed by evaluating the optimized solid/liquid ratio and conducted in a shaker incubator, at three different temperatures (15.0±0.1 °C, 25 ,0±0.1 °C and 35.0±0.1 °C) and 150±1 rpm, for 48 hours.

7
  • ROMERO TORRES BUENO
  • CATALYTIC COMBUSTION OF ACRYLONITRILE OVER CuCeOx-HBETA CATALYSTS

  • Leader : MARCELO DA SILVA BATISTA
  • MEMBRES DE LA BANQUE :
  • MARCELO DA SILVA BATISTA
  • DEMIAN PATRICK FABIANO
  • ANDRÉ GUSTAVO SATO
  • Data: 20 déc. 2023


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  • Acrylonitrile (ACN) is one of the most used monomers in the chemical industry, being used
    in the synthesis of plastics, rubbers and acrylic fibers, for example. However, it is also a
    volatile organic compound (VOC) of high toxicity, which is present in industrial exhaust
    gases. These gases, therefore, require appropriate treatment. In this context, selective catalytic
    combustion (CCS) stands out as a highly promising technology for removing ACN in
    industrial gas effluents. This method consists of using catalysts to reduce the temperatures
    required for combustion and control the formation of unwanted by-products, such as nitrogen
    oxides (NOx). Thus, this study aimed to study catalysts based on BETA zeolite, modified
    with copper and cerium (CuCeOx-HBETA), in the ACN CCS reaction. These materials were
    prepared by wet impregnation and characterized by the techniques of X-ray diffraction
    (XRD), Fourier transform infrared spectroscopy (FTIR), diffuse reflectance spectroscopy in
    the visible ultraviolet region (DRS UV-Vis) and reduction with hydrogen at the programmed
    temperature (RTP-H2). The performance of these catalysts in ACN CCS was evaluated using
    catalytic tests. XRD results showed that copper and/or cerium oxides are present in the
    catalysts as nanoparticles. CeO2 presented nanocrystal sizes (5.7-8.0 nm) smaller than CuO
    nanocrystals (~20 nm). Through FTIR analyses, a great similarity was noted between the
    spectra of the CuCeOx-HBETA catalysts and that of HBETA, indicating that their structure
    was preserved after the wet impregnation and heat treatment process. By UV-Vis DRS, bands
    related to Cu2+, [Cu-O-Cu]2+, CuO, Ce3+ and Ce4+ species were observed in the spectra of
    CuCeOx-HBETA catalysts. RTP-H2 results revealed that the dispersion and reducibility of
    CuO were improved due to the presence of CeO2. Finally, catalytic tests showed that
    CuCeOx-HBETA catalysts achieved high conversions between 300-350°C. The greater
    activity of the catalysts was attributed to the presence of highly dispersed CuO species and
    isolated Cu2+ ions. The 10Cu10Ce-HBETA catalyst, with a copper/cerium ratio equal to 1,
    was the most active due to the best synergy between copper and cerium species. Furthermore,
    the catalysts showed good selectivity in relation to the formation of N2, since the formation of
    NOx was insignificant.

2022
Thèses
1
  • LETÍCIA SILVEIRA
  • PRODUCTION OF ALGINATE BIOFILM ADDED VANILLIN FOR APPLICATION AS BIO-CURATIVE

  • Leader : RENATA CAROLINA ZANETTI LOFRANO
  • MEMBRES DE LA BANQUE :
  • RENATA CAROLINA ZANETTI LOFRANO
  • CRISTIANE MEDINA FINZI QUINTAO
  • MATEUS DE SOUZA AMARAL
  • Data: 13 janv. 2022


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  • The use of biopolymers from renewable resources is highly studied and they are, in general, biodegradable, biocompatible and can be obtained at low cost. Biopolymers have many applications, for instance in health, known as biomaterial. In this way, this work aims to synthesize a biopolymer of alginate and vanillin using glycerol and calcium chloride as plasticizer and crosslinking agent, respectively. Using design of experiments, different biopolymers were produced and analysing the solubility and the swelling degree, the best region, regarding the application, was found, corresponding to the one using vanillin at concentration up to 0.015 g, and the calcium chloride, values higher than 0.090 g, obtaining films with solubility around 30 % and the swelling degree between 100 and 120 %. Regarding the process optimization it is concluded that the NBI method can analyze concave regions, predicting the optimal points and generating the Pareto chart with equispaced boundaries. The antimicrobial test allowed to observe the antimicrobial activity of the validated films in the optimization, as well as vanillin solution with calcium chloride and glycerol, comparing the results with the control film, obtaining an innibition halo only in the presence of vanillin. Thermal analyses of thermogravimetric analysis and differential scanning calorimetry demonstrated that the material has thermal stability. The biofilm produced shows potential for
    application as a biomaterial.

2
  • EDUARDO ZANITTI ÁVILA COUTO
  • COMBUSTION OF ACRYLONITRILE ON CATALYSTS (Cu or Ce)-OXIDE and (CuO or CeO2)-BETA

  • Leader : MARCELO DA SILVA BATISTA
  • MEMBRES DE LA BANQUE :
  • ANDRÉ GUSTAVO SATO
  • JORGE DAVID ALGUIAR BELLIDO
  • MARCELO DA SILVA BATISTA
  • Data: 5 mars 2022


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  • The emission of acrylonitrile resulting from its production generates serious environmental problems and consequently to human health. Selective catalytic oxidation has been shown to be a relevant method for solving this problem, being more efficient than conventional combustion. This method consists of the use of catalysts capable of reducing the activation energy of the reaction and selecting the desired product, minimizing as much damage as possible to the damage caused in the process. In this work, CuO, CeO2, CuO-BETA catalysts were used in the selective catalytic oxidation of acrylonitrile in order to decrease the operating temperature (<800ºC) and preferably produce N2, mitigating environmental damage. The mass catalysts of CuO and CeO2 were obtained commercially while the supported CuO-BETA was prepared by the incipient impregnation method. Subsequently, the four catalysts were characterized by XRD, TPR-H2 and UV-Vis spectroscopy. XRD results showed characteristic peaks of copper oxides (CuO) and cerium (CeO2) in the mass and supported catalysts. The addition of these oxides to the support by the incipient impregnation method did not alter the morphology of zeolite-BETA. TPR-H2 profiles indicated that the copper oxide supported in beta zeolite led to a decrease in the temperature of reduction of copper species. UV-Vis spectroscopy analyses identified the presence of Cu2+ions, [Cu-O-Cu]2+ and Ce4+, as well as CuO nanoparticles in the CuO-BETA catalyst. The catalytic assays showed that the catalysts present good activity for the selective oxidation of acrylonitrile, causing a significant decrease in reaction temperature, ceo2 being the most promising among them for presenting lower reaction temperature and higher selectivity for N2 and CO2 formation.

3
  • MARCELA MAGALHAES DE PAULA
  • INFLUENCE OF THE POLYMERIC PRECURSOR ON THE SYNTHESIS VIA ONE STEP POLYMERIZATION OF CuO/CeO2 CATALYSTS AND EVALUATION IN SELECTIVE CATALYTIC OXIDATION OF ACETRONITRILE

  • Leader : JORGE DAVID ALGUIAR BELLIDO
  • MEMBRES DE LA BANQUE :
  • JORGE DAVID ALGUIAR BELLIDO
  • MARCELO DA SILVA BATISTA
  • ADRIANO LOPES DE SOUZA
  • Data: 29 juin 2022


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  • Given the growing concern about air pollution caused by the emission of greenhouse gases and volatile organic compounds, such as ammonia, carbon monoxide and nitrided gases, several alternatives have emerged to contain it. In view of the technologies already implemented, in the present work selective catalytic oxidation was applied to treat acetonitrile on CeO2 supports and CuO/CeO2 catalysts synthesized by the one-step polymerization method. In which the focus was to evaluate the influence of the complexing agent, varying the acids, in citric, malic and oxalic, and the presence of copper II in the final properties of the catalysts. As well as the catalytic performance during the reaction and their respective selectivities in N2 and CO2 production. Finally, the effects of these variants on the formed materials were investigated through physical characterization techniques, such as Thermogravimetric Analysis (ATG), Fourier Transform Infrared Spectroscopy (FTIR), X-Ray Diffraction (XRD), Physisorption with N2 (B.E.T. method), Scanning Electron Microscopy (SEM), Programmed Temperature Reduction (TPR-H2) and Temperature Programmed Desorption (TPD-CO2). From the XRD diffratrograms, the presence of CeO2 in the prepared catalysts was identified, it was also noted that the deposition of CuO in the synthesized materials did not change their structure. Physisorption analyzes with N2 provided isotherm profiles that varied between supports and catalysts, in addition to demonstrating that those synthesized with oxalic acid (CeOx and CeOxCu) had the highest specific areas, compared to those with malic acid (CeMa and CeMaCu). and citrus (CeCi and CeCiCu). Since these presented larger volumes and pore sizes as evidenced in the BET, these properties were related to the stability of their polymeric chains demonstrated by the ATG. Furthermore, in catalytic tests conducted in the range of 100-600 °C for 1 hour, 100% conversion of acetonitrile was identified for all supports and catalysts at temperatures below 350 °C. With high selectivity in N2 and CO2 for CeMa and CeMaCu.

4
  • Carla Cristina Araujo Parreira
  • DEVELOPMENT OF A NEW EQUATION FOR FORECAST PARAMETERS OF NUCLEAR FISSION REACTORS FROM DYNAMIC MODELING AND SIMULATION

  • Leader : JUAN CANELLAS BOSCH NETO
  • MEMBRES DE LA BANQUE :
  • JUAN CANELLAS BOSCH NETO
  • EDSON ROMANO NUCCI
  • MARCELO CARDOSO
  • Data: 7 juil. 2022


  • Afficher le Résumé
  • The viability of nuclear reactors depends on an efficient safety system in the operation of nuclear processing units. Much of the safety of nuclear fission reactors is related to the neutron density that requires a well-balanced balance between the emitted neutrons and the lost neutrons (via neutron absorption or leakage), in order to avoid major damage such as overheating and possible explosions. In the present work, a literature review on nuclear energy, dynamic modeling and simulation of a nuclear reactor and the development of a new equation (system of non-linear differential equations) for prediction of neutron density, power and fractions was carried out. delayed neutron precursor groups in a nuclear fission reactor and application of fuzzy logic. According to the literature, the system of nonlinear differential equations proposed by Duderstadt and Hamilton is one of the most representative for the prediction of neutron density, but it has a deficiency in the result of neutron density in moderate systems. In this work, the Duderstadt and Hamilton equation was modified with the insertion of new terms in the neutron density, power and concentration equations of the delayed neutron generator groups, generating a system of seven nonlinear differential equations that were solved by the Runge Kutta method. fourth order in the OCTAVE free software. From the proposed model, dynamic simulations of fission nuclear reactors were performed. The simulations resulted in the neutron density, the reactor power estimation and the estimation of the mass fractions of the late neutron precursor groups. The validation of the new proposed model was performed by superimposing the plotting of simulation results on the plotting of experimental data from the literature for the PWR TRIGA reactor at CDTN/UFMG. Through Fuzzy Logic, it was possible to perform a numerical estimate in relation to the percentages of neutrons in the Reactor. With this analysis, we obtained a value of approximately 60% of neutrons that must be emitted by the primary source in the Reactor and 41% of neutrons that must be absorbed by the moderators. The new equation proposed by the author resulted in an adequate compatibility between the proposed model and the experimental data. This new equation is an important tool for the design of control systems for nuclear fission reactors, representing an interesting suggestion for future work.
5
  • Matheus Furlan Pinheiro
  • DEVELOPMENT OF A NANOBUBBLE GENERATOR PROTOTYPE FOR A FLOTATION PROCESS ASSOCIATED WITH THE DEVELOPMENT OF A MODIFIED STARCH-BASED DEPRESSOR

  • Leader : FABIANO LUIZ NAVES
  • MEMBRES DE LA BANQUE :
  • EDUARDO PRADO BASTON
  • FABIANO LUIZ NAVES
  • JOSÉ IZAQUIEL SANTOS DA SILVA
  • RENATA CAROLINA ZANETTI LOFRANO
  • Data: 11 nov. 2022


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  • The reduction of high iron content reserves and the need for economic use of all extracted
    mineral resources, makes the separation of fine and ultrafine ore a reason of important research
    resources. Flotation is the unit operation most used in the separation of particles of
    granulometry between 10 μm and 300 μm, but the comminution present in the initial stages of
    processing, produces smaller particles, commonly discarded in the form of wet or dry tailings.
    In this context, the use of micro and nanobubbles in reverse cationic flotation, with gelatinized
    starch as a depressant, has been tested in order to increase the recovery of this particulate by
    different mechanisms. This work seeks to evaluate the influence of the use of micro and
    nanobubbles in the reverse cationic flotation process, of iron ore processing waste, together
    with the use of starch modified by an association of thermal and alkaline treatment, with
    Ammonium Hydroxide. For the bubbles generation, a pumping system was built, using a
    venturi tube for air suction, in the pump suction, and subsequent pressurization of the system at
    5 bar, in a saturation vessel. Design of experiments (DOE) was applied for modeling a Response
    Surface Designd CCD) and process optimization through the Normal Boundary Intersection
    (NBI) algorithm, obtaining parameters of maximum recovery of iron ore fines.

6
  • Gabriela Martins de Paiva
  • PRODUCTION OF BACTERIAL NANOCELLULOSE FROM WASTE BREWER'S YEAST FOR ADSORPTION OF Cu(II), Fe(III), Ni(II) and Co(II) FROM MINING EFFLUENTS

  • Leader : IGOR JOSE BOGGIONE SANTOS
  • MEMBRES DE LA BANQUE :
  • IGOR JOSE BOGGIONE SANTOS
  • EDSON ROMANO NUCCI
  • FERNANDA PALLADINO PEDROSO
  • RITA DE CASSIA SUPERBI DE SOUSA
  • Data: 29 nov. 2022


  • Afficher le Résumé
  • Brazil is one of the main producers and exporters of iron ore in the world, with a production of 358.0 million tons in the year 2021. Due to the large volume of production, there is, consequently, the generation of a large volume of liquid waste that needs be treated before being disposed of in the environment, as they have a high content of heavy metals. However, the treatments, hitherto known, are expensive and complex. An economical and environmentally viable alternative for the treatment of these residues is the use of bacterial nanocellulose as an adsorbent of the heavy metals present in the composition of the residues, due to its properties of biocompatibility and biodegradability. However, further studies are needed to increase production efficiency, changing fermentation parameters and evaluating the use of alternative substrates. The Brazilian brewing industry produces around 14.0 billion liters of beer a year and, with that, a large volume of nutritionally rich waste. With its high nutritional value, the residues are excellent substrate candidates for bacteria producing bacterial nanocellulose, adding value to them. Given this scenario, the present research project aims to (i) the static production of bacterial nanocellulose using the brewing industry waste as a substrate, (ii) the obtainment of an adsorbent composed of bacterial nanocellulose for the treatment of waste from the mining industry and (iii) recovery of heavy metals and iron oxide from mining industry effluents for reuse in industries. It was possible to obtain approximately 1532 mg of bacterial nanocellulose through the batch system. As an adsorbent, the material showed to be very promising, obtaining a maximum adsorption capacity for the metals Co (II), Ni (II) and Cu (II) of, respectively, 0.0739, 0.2504 and 0.3945 mg· g-1. For the same metals, the removal rate of the synthetic solutions studied was, respectively, 62.56, 39.13 and 61.64%

7
  • Fernanda Carlos Monteiro
  • EVALUATION OF ENERGY INTEGRATION OF A BIOREFINERY AIMING FOR THE PRODUCTION OF SECOND GENERATION ETHANOL USING PINCH ANALYSIS

  • Leader : BOUTROS SARROUH
  • MEMBRES DE LA BANQUE :
  • BOUTROS SARROUH
  • RENATA CAROLINA ZANETTI LOFRANO
  • FERNANDO MASARIN
  • Data: 30 nov. 2022


  • Afficher le Résumé
  • The use of sugarcane bagasse for the production of second-generation ethanol is a viable alternative for the destination of bagasse that is not all used within a sugarcane plant, as it adds value to this residue. About 280.33kg/h of sugarcane bagasse generates a total of 886.23kg of ethanol after

    12 hours of operation. With the addition of heat exchangers in the second generation ethanol production flowchart proposed in this work, it was possible to reduce the consumption of hot and cold utilities by 23.60% and 48.84%,

    respectively. With the reduction of utilities, production costs and environmental impacts are also reduced, making production more advantageous when compared to production in which there is no heat exchanger

    present to help preheat or pre-cool system equipment.

8
  • KEIVY EVILÁZIO GOMES
  • APPLICATION OF FUZZY LOGIC IN QUALITY CONTROL IN BEER PRODUCTION

  • Leader : EDSON ROMANO NUCCI
  • MEMBRES DE LA BANQUE :
  • EDSON ROMANO NUCCI
  • JUAN CANELLAS BOSCH NETO
  • ALESSANDRA COSTA VILACA
  • ANDRE AGUIAR MENDES
  • Data: 1 déc. 2022


  • Afficher le Résumé
  • The brewing sector, due to the increase in production activity and the more demanding taste of the consumer, has sought to improve the quality of the beer produced, having even used artificial intelligence methodologies to deal with the uncertainty, subjectivity and complexity associated with this type of bioprocess engineering problem. The Fuzzy system is one of those methodologies that, in addition to generality, expressive power and the ability to model real-world problems, act to circumvent the imprecision implicit in decision-making problems. Thus, this research aimed to develop two decision support systems through a Fuzzy system. The first Fuzzy system was developed to evaluate the quality of Pilsen beer, and the second Fuzzy system aimed to identify different types of beer. The methodology involved collecting user information about the following types of beer: Pilsen, Wheat, Stout and IPA. The system was developed using Scilab® and INFUZZY Software and the input variables for the first decision support system were CO2, color, density, pH and alcohol content, and the response variable was beer quality. . The developed system had a hit rate above 90% for beer approved for consumption and 85% for beer that was not approved. In addition, considering simulated scenarios, the second Fuzzy system correctly predicted, more than 99% of the time, the alcohol content, color and density of the beer produced, indicating to the user the type of beer chosen.

9
  • Lívia Mara Cândido
  • RECOVERY OF NIOBIUM FROM TAILINGS GENERATED

    THROUGH THE PROCESSING OF APATHIC ORES

  • Leader : JUAN CANELLAS BOSCH NETO
  • MEMBRES DE LA BANQUE :
  • JUAN CANELLAS BOSCH NETO
  • DEMIAN PATRICK FABIANO
  • EDSON ROMANO NUCCI
  • MARCELO CARDOSO
  • Data: 2 déc. 2022


  • Afficher le Résumé
  • Brazil has one of the world's largest reserves of niobium. In apatite beneficiation processes, niobium minerals are often found and have an extremely fine granulometry and are commonly disposed in a dam. The objectives of this work were: to evaluate, through the kinetic study of flotation, the metallurgical recovery rates of niobium ore for different granulometric ranges and to use the response surface techniques and statistical design of experiments. In this context, samples were collected from the apatite processing tailings streams that have a high niobium content and incorporated into the samples for niobium flotation. Bench flotation tests were carried out and a subsequent kinetic adjustment was carried out, based on the accumulated metallurgical recovery data. An experimental design of the type Central Composite Rotational Design (CCRD; Central Composite Rotational Design) was initially used, which is part of the response surface methodology (RSM; Response Surface Methodology), with the proposal of finding the optimal points of the main variables, given the simultaneous analysis of the three response variables. As a result, the highest value found for the kinetic constant was 0.0195 s-1, corresponding to granulometry below 37μm. When using the response surface technique, with the optimization of the variables, a metallurgical recovery of 70% was obtained for the granulometric range below 37μm. It is concluded that for the optimization of the niobium flotation process, the granulometry must be kept below 37μm and above 5μm, so that significant losses do not occur in the process. The optimization of the results and the collector dosage factors, pH and surfactant/collector partition to be considered optimal were 881 g/ton, 6.7 and 24%/76%, respectively

10
  • Paula Maricele da Silva
  • SYNTHESIS OF GEOPOLYMERS PRODUCED FROM ALUMINOSILICATE FROM AMPHIBOLITES FOR APPLICATION IN CIVIL CONSTRUCTION

     

     


  • Leader : FABIANO LUIZ NAVES
  • MEMBRES DE LA BANQUE :
  • FABIANO LUIZ NAVES
  • GISELLA ROSSANA LAMAS SAMANAMUD
  • MARIANA ARRUDA PEREIRA
  • MATEUS DE SOUZA AMARAL
  • RENATA CAROLINA ZANETTI LOFRANO
  • Data: 7 déc. 2022


  • Afficher le Résumé
  • Geopolymers are inorganic macromolecules produced by alkaline activation of aluminosilicate materials. Its use in civil construction is a promising alternative to replace Portland cement (PC), whose manufacture is responsible for 7% of CO2 emissions on the planet. In addition, the production of geopolymers is environmentally sustainable, as its raw material is industrial waste that can be used and recovered, rather than being discarded. For the development of the geopolymer, a precursor is needed, such as an aluminosilicate mineral, and an alkaline activator, such as NaOH or sodium silicate. This work aimed to analyze the mechanical properties of a geopolymer produced from niobium mining waste, especially the amphibolite rock, used as a precursor. According to the Extreme Vertices mixture experimental design methodology, specimens were prepared with different molar ratios of SiO2/Al2O3, Na2O/SiO2 and H2O/Na2O, under curing conditions at room temperature. The samples were submitted to axial compressive strength and tensile strength tests. The results obtained in the response surface contour region ranged from 0.04 to 0.26 MPa for tensile bond strength and from 0.7 to 1.96 MPa for compressive strength. The interpretation of the generated response model indicated optimal values of proportions of NaOH, SiO2 and water for the experiment performed. The values were close to those established by technical standards for mortars and cements (ABNT, 2005). Therefore, it is argued that viability of amphibolite as a geopolymer and raw material in civil construction.

11
  • Renan Gabriel Condé Santos
  • SYNTHESIS AND CHARACTERIZATION OF MIXED MATERIAL OF EUCALYPTUS CHARCOAL AND ALUMINUM BY THE SOL-GEL METHOD

  • Leader : ALEXANDRE BOSCARO FRANCA
  • MEMBRES DE LA BANQUE :
  • ALEXANDRE BOSCARO FRANCA
  • EDUARDO PRADO BASTON
  • FABIANO LUIZ NAVES
  • MATEUS DE SOUZA AMARAL
  • Data: 14 déc. 2022


  • Afficher le Résumé
  • Charcoal has flexibility in its applications, being able to compose from components for pigmentation of paints to, when going through an activation process, to be applied in catalytic and adsorptive processes. Subsequently, the coal can undergo thermal and chemical treatments, such as calcination and impregnation, to further optimize its characteristics. A synthesis process currently studied is the sol-gel process, in which a colloidal solution is used that rapidly precipitates forming a gel and, being heat treated, can generate a micro or meso-porous material, increasing its specific area. This work aimed to develop a support for a catalyst based on charcoal and alumina, which was synthesized in the charcoal pores by the sol-gel method using steam in the hydrolysis step. The synthesis inside the pores can be verified by a set of analyzes such as: XRD, where it was possible to assume the presence of structures of pseudoboehmite and γ-alumina; Thermogravimetry indicated a reduction in mass loss for the treated coal due to the thermal stability of the alumina; Physisorption of N2 indicated an increase in specific area (8.97%) and total pore volume increased (9.48%) in relation to untreated coal; SEM/EDS confirmed the presence of aluminum oxide inside the walls of the pores of the coal, as well as on its surface, which could be observed due to the magnification of the sample and by energy dispersive X-ray spectroscopy. Therefore, in the tests carried out, there is a strong indication of the production of the mixed material of coal/alumina sol-gel object of study of this work.

12
  • Bruna Paloma Ribeiro
  • IMMOBILIZATION OF MICROORGANISMS IN CARRAGEENA SPHERES

  • Leader : DEMIAN PATRICK FABIANO
  • MEMBRES DE LA BANQUE :
  • DEMIAN PATRICK FABIANO
  • EDSON ROMANO NUCCI
  • JUAN CANELLAS BOSCH NETO
  • CÍNTHIA MARIA FELÍCIO
  • Data: 22 déc. 2022


  • Afficher le Résumé
  •  

    The present work aimed to synthesize carrageenan spheres and to immobilize microorganisms in their polymeric structure. Two yeasts Saccharomyces pastorianus and Saccharomyces cerevisiae with immobilized microorganisms were chosen. The immobilized yeasts were tested in fermentation using three different substrates: brown sugar, crystal sugar and D(+)sucrose. The synthesis of the carrageenan sphere was achieved when there was a combination of the concentrations of two solutions: the carrageenan solution, at a concentration of 10 g.L-1, and the KCl solution, at a concentration of 0.848 mol. L-1. At these same concentrations, it was possible to immobilize the yeasts in the carrageenan polymeric matrix and form spheres. The results of the fermentations with immobilized yeasts show that the consumption of sugar occurs by two factors: by the adsorption of sugar in the polymeric matrix of the carrageenan, due to the electrostatic interactions between them and also by the consumption of sugar by the immobilized yeasts. Sucrose was the best sugar to use as a substrate. Regarding the microorganisms, it can be noted that Saccharomyces cerevisiae obtained more satisfactory results, due to the greater speed and greater consumption of sugar, in comparison with the other yeast. This higher consumption can be explained by the greater amount of viable cells present within the spheres. In addition, the spheres were dried with immobilized yeasts in the desiccator, in an oven and naturally. However, the cells after rehydration of the beads are not viable. In view of all this, it can be concluded that microorganism cells can be immobilized in carrageenan spheres, however, the immobilization process must be refined to increase cell viability. In addition, immobilized cells can be used and reused in biotechnological processes to produce products of interest.

2021
Thèses
1
  • ISABELA DE FÁTIMA SILVA VIDAL
  • COLORIMETRIC SENSOR WITH ANTHOCYANINS APPLIED TO INTELLIGENT PACKAGES FOR DETECTION OF THE CONSERVATION STATUS OF SWINE MEAT VIA CHANGE OF pH

  • Leader : IGOR JOSE BOGGIONE SANTOS
  • MEMBRES DE LA BANQUE :
  • DALILA MOREIRA DA SILVEIRA
  • IGOR JOSE BOGGIONE SANTOS
  • JOSÉ ANTÔNIO DE QUEIROZ LAFETÁ JÚNIOR
  • PATRICIA DA LUZ MESQUITA
  • Data: 5 févr. 2021


  • Afficher le Résumé
  • Nowadays, pork is one of the most consumed animal proteins in the world due its high nutritional value and low cost. However, it is a perishable food which has a shorter shelf life due the favorable conditions for microorganism growth. In this sense, intelligent packaging emerges as an alternative to improve preservation and protection and avoid property alterations in food, ensuring its security. The incorporation of pigments in materials to produce intelligent packaging, is an alternative to identify changes in food conservation conditions by color modification in packaging. In this work, a colorimetric film applied to intelligent packaging was produced based in carboxymethylcellulose, glycerol, and anthocyanins extracted from black rice byproduct to detect freshness condition of pork. Systems film/meat were exposed to room temperature and refrigeration to investigate coloring film changes in function of pork loin deterioration. Colorimetric parameters were defined to study film behavior and it was possible to clearly perceive visual alterations according to the progress in the pork decomposition process. To the systems exposed to 25 °C, the reddish film at a pH of 6.05 ± 0.01 became bluish-purple at a pH of 6.52 ± 0.01 and yellow at a pH of 7.00 ± 0.08. Films stored at 4 °C turned from reddish at a pH of 6.01 ± 0.02 to bluish-purple at a pH of 6.58 ± 0.01 and then to yellowish at a pH of 7.12 ± 0.01. Posteriorly, some characterization tests were performed with average values to tensile strength of 20.28 ± 2.53 MPa, elongation of 28.66 ± 0.05%, elastic modulus of 76.32 ± 16.51 MPa, and thickness between 118.80 ± 17.94 and 192.60 ± 8.52 µm. Grammage and water vapor permeability exhibited average values of 176.05 ± 2.30 g·m-2 e 2.30 ± 0.06 g·mm·dia-1·kPa-1·m-2, respectively. Thermal analyzes have shown that the material has thermal stability. The developed sensor demonstrated potential application to indicate preservation conditions of pork in intelligent packaging.

2
  • MAYARA REZENDE CARVALHO
  • EXTRATIVE DISTILLATION PROCESS OF HYDRATED ETHANOL: OPTIMIZATION VIA RESPONSE SURFACE METHODOLOGY AND MONITORING VIA PRINCIPAL COMPONENT ANALYSIS USING COMPUTER SIMULATION BY ASPEN PLUS

  • Leader : EDSON ROMANO NUCCI
  • MEMBRES DE LA BANQUE :
  • ANTONIO JOSÉ GONÇALVES DA CRUZ
  • EDSON ROMANO NUCCI
  • GUSTAVO MATHEUS DE ALMEIDA
  • JUAN CANELLAS BOSCH NETO
  • PATRICIA DA LUZ MESQUITA
  • Data: 19 févr. 2021


  • Afficher le Résumé
  • The present work aimed the optimization and the monitoring of the extractive distillation process to obtain anhydrous ethanol, through computer simulation in the software Aspen Plus®. For optimization, a static process model was implemented, and for monitoring, a dynamic closed-loop model. Anhydrous ethanol is important because it is used as an additive in gasoline to mainly increase the octane rating of this fuel. One challenge is to obtain ethanol with content above 99% purity, for use in the transport sector. Currently, in Brazil, one of the most used processes for obtaining anhydrous ethanol is extractive distillation. To optimize this system, initially, a full factorial design 22 with 5 central points was used in order to investigate the effects of solvent temperature and reflux ratio, in addition to the interaction between both factors, on the concentration of ethanol in the top product and reboiler heat duty of the extractive column. The curvature was also verified, given the domain of the factors. The central composite rotational design (CCRD), which is part of the response surface methodology (RSM), was used to obtain the optimum points of operation of the process, given the simultaneous evaluation of both response variables. It was found that the best operating point for the solvent temperature would be 80° C, and the reflux ratio, 0.31. The values of the ethanol content in the top product and the reboiler heat duty are 99.6% and 1472kW, respectively. Regarding the monitoring of the process, a set of usual faults in extractive distillation columns was simulated. Step disturbances and variations in the standard deviation, with different magnitudes, in input and intermediate variables were evaluated. To detect these failures, the multivariate statistical technique called Principal Component Analysis (PCA) was applied, using the T2 of Hotteling and Q. PCA is a dimensionality reduction technique, commonly applied to problems monitoring continuous chemical processes. The degree of difficulty in detecting the failures was discussed, and this characteristic was correlated with the operation of extractive distillation columns.

3
  • MARIANA SIMÕES GUALBERTO
  • SYNTHESIS AND CHARACTERIZATION OF POLYURETHANE FOAMS FROM A MIXTURE OF RESIDUAL SOYBEAN AND MORINGA POLYOLS

  • Leader : EDUARDO PRADO BASTON
  • MEMBRES DE LA BANQUE :
  • EDUARDO PRADO BASTON
  • JORGE DAVID ALGUIAR BELLIDO
  • CRISTIANE MEDINA FINZI QUINTAO
  • KÁTIA MONTEIRO NOVACK
  • Data: 23 juil. 2021


  • Afficher le Résumé
  • This work refers to the synthesis of polyols from vegetable oil extracted from moringa seeds and residual soybean oil of 12 and 24 hours of frying, which were used for the production of polyurethane foams from their mixture with previously determined proportions. The oils were functionalized using the peracid hydroxylation in situ methodology. The production of residual soybean polyol differs from the methodology applied to moringa oil in that it is preceded by an esterification stage, which aims to reduce the free fatty acids present in large quantities due to the thermal degradation to which the soybean oil was submitted. The precursor oils and their polyols were evaluated by physicochemical analyses, such as acidity and hydroxyl indices, and by characterization techniques such as Fourier Transform Infrared Spectroscopy (FTIR), Nuclear Magnetic Resonance (NMR), and Mass Spectrometry (MS), which allowed to confirm the conversion of oils into polyols, qualify them and infer properties of the foams later formulated, such as their stiffness/flexibility. It was possible to observe that the frying time is inversely proportional to the unsaturation content identified in the samples and directly proportional to its acidity index. The hydroxylated polyols, when compared to their oils, showed an increase in the content of free fatty acids, in the numbers of hydroxyls and molecular weights. Such changes reflect the functionalization of the oils and the applicability of the polyols for the formation of urethane groups. The Moringa polyol and the residual soybean polyols, 12 and 24 hours of frying presented acidity indexes below 5 mg KOH.g-1 and functionality of 2.5 (12h) and 2.9 (24h) for soybean and 4.9 for the moringa. These results indicate that polyols have potential in the production of flexible and semi-flexible polyurethane foams.

4
  • BRUNA MARIA PATERLINE NOVAIS ABREU
  • USE OF MODIFIED SYNTHETIC CLAYS OF THE HYDROTALCITE TYPE (FeMgAl, CuMgAl, CuFe) FOR THE REMOVAL OF SODIUM DICHLOPHENAC IN AQUEOUS MEDIUM

  • Leader : DEMIAN PATRICK FABIANO
  • MEMBRES DE LA BANQUE :
  • DEMIAN PATRICK FABIANO
  • ALEXANDRE BOSCARO FRANCA
  • LETÍCIA LEDO MARCINIUK
  • Data: 27 juil. 2021


  • Afficher le Résumé
  • This study has as its main goal to evaluate the adsorbing capacity of the hydrotalcite like synthetic clays modified with Cu and Fe (CuFe, CuMgAl, FeMgAl), calcinated in different temperatures (300, 400 and 500ºC), removing the drug Sodium Diclofenate (SD) diluted on aqueous mean. The adsorbing materials were synthetized by the coprecipitation and the coprecipitation at low supersaturation methods and they were characterized by the following techniques: X-ray diffractometry (XRD), which confirmed the formation of the hydrotalcites structure, presenting peaks characteristics of the material and suggested the incorporation of the metals of transition Cu and Fe within the structure of the sample; Nitrogen physisorption (BET method) which provided the superficial area, the average pore size (7,99nm) and larger total volume of pores of FeMgAl300 (48,08 cm³g⁻¹); and ph at the point of zero charge (PZC), used to foresee the effective superficial charge of the samples, resulting in pH of 7,0, 8,59 and 8,56 for CuFe, CuMgAl and FeMgAl, respectively. The time of contact and the effect of the temperature of calcination on the adsorption for the removal of SD were evaluated. It was observed that the adsorption process with the CuFe clay reaches balance at approximately 30 min, removing 75-80% compared to the non-calcinated sample; the pseudo-second order model was the most adequate describing the adsorption process, generating a R2 coefficient close to the unity, having qe=40,72mgg⁻¹, qe(real)=40,94 mgg⁻¹ and K2=0,033gmg⁻¹min⁻¹. The study of the adsorption isotherm was performed for the CuFe sample, due to its high adsorption rate, it was concluded that the Freudlinch model was the most adequate describing the process. The CuMgAl and FeMgAl hydrotalcites appeared to be inefficient, having percentages of removal of 2-7,5% and 6-10% respectively. It was also observed that the temperature of calcination and the variation of the initial pH did not influence the percentual of removal of the SD.

5
  • JHONATAN RAFAEL DE OLIVEIRA BIANCHI
  • INCORPORATION OF NANOSTRUCTURED ALFA-LA IN MINAS FRESCAL CHEESE FOR SODIUM REDUCTION AND FUNCTIONAL IMPROVEMENT

     

  • Leader : IGOR JOSE BOGGIONE SANTOS
  • MEMBRES DE LA BANQUE :
  • IGOR JOSE BOGGIONE SANTOS
  • CRISTIANE MEDINA FINZI QUINTAO
  • EDSON ROMANO NUCCI
  • BRUNO RICARDO DE CASTRO LEITE JUNIOR
  • JANE SELIA DOS REIS COIMBRA
  • Data: 6 août 2021


  • Afficher le Résumé
  • The use of nanoprotein α-lactoalbumin (α-la) as a substitute for NaCl in the production of minas frescal cheese was tested in this work, to produce a cheese with less sodium and with the same technical-functional properties given the need to reduce the consumption of NaCl that causes damage to human health. In addition, nano α-la is a bioactive encapsulating agent, which can then make the Minas Frescal cheese a nutraceutical food. The synthesis of nano α-la showed a protein with a hydrodynamic radius of 191.10 ± 21.33 nm and PDI of 0.359 ± 0.059 via Dynamic Light Scattering (DLS) and MET indicates spherical nanostructures with a size of 16.98 ± 2 , 14 nm. The thermal analysis of the nano indicates a mass decay at 84 ºC by the TG and the DSC indicated an enthalpy of -253.2 J · g-1 for denaturation of the nanoprotein at 57.8 ºC. The encapsulation efficiency (EE) and the binding capacity (LC), respectively, 98.50 ± 0.28% EE and 74.32 ± 1.22% LC for quercetin and 69.36 ± 0.82% EE and 12.38 ± 0.15% LC for vitamin B2. The optimization and analysis of the influence of nano α-la on cheese carried out by a Rotational Experimental Design (DCCR) had as dependent variables physical-chemical parameters (pH, titratable acidity, soluble solids, and conductivity) and texture profile analysis (TPA), determining a methodology for the production of minas "frescal" cheese with 292 µL of nano α-la 2 mg · mL-1, 2.5 g of NaCl and 0.0 g of KCl for 500 ml of milk.

6
  • HERÁCLITO ALEXANDRE DOS SANTOS
  • MODELING AND OPTIMIZATION OF THE BIO-OIL PRODUCTION PROCESS FROM POLYPROPYLENE PACKAGING

  • Leader : FABIANO LUIZ NAVES
  • MEMBRES DE LA BANQUE :
  • FABIANO LUIZ NAVES
  • CRISTIANE MEDINA FINZI QUINTAO
  • MARIANA ARRUDA PEREIRA
  • MATEUS DE SOUZA AMARAL
  • Data: 20 août 2021


  • Afficher le Résumé
  • Plastic is found in the most diverse types of consumer goods, whether they are durable or not very durable; many times they are disposed of incorrectly either in dumps and or in landfills, thus affecting the environment. In the literature it is possible to find several studies related to the development and application of technological processes that allow the reuse and treatment of plastic waste. There are countless ways to treat them, the known method being 3R (recycling, reusing and reducing) the generation of waste. The use of thermal degradation techniques are used as tools to be applied in new technologies that seek to understand the decomposition mechanisms of polymers. Pyrolysis appears as a way to use the plastic products found, transforming them into gases that, after being condensed, produce bio-oil. It is considered to be an efficient and low-cost process. This work aims to obtain oil from disposable packaging polypropylene, aiming at the modeling and optimization of the pyrolysis process using the Normal Boundary Intersection (NBI) algorithm, so that, later, it can represent a pyrolysis process on larger scales. Thus, from the above, the possibility of reusing plastics brings a scientific and socioeconomic aspect, so that the technological frontier can be fostered for energy production, which currently sources are few and little stratified. The input for the production of fuel oil in this work, was the recycled polypropylene of tips used in micropipettes (50gr) being added kaolin varying the amount as proposed in the experiments; the temperature was 512ºC and the heating ramp / min. it was also varied. The time for each experiment was determined in 90 min, after which the process was ended. It was possible to verify that when using smaller heating ramps, it favored a volume of oil produced; and, in relation to the use of kaolin, when using larger mass with a higher heating ramp, they present factors that can harm the production of bio-oil.

7
  • SAYMON MENEZES DE SOUZA
  • REMOVAL OF STAINLESS STEEL BACTERIAL BIOFILMS BY NEW SANITIZATION PROCESSES

  • Leader : IGOR JOSE BOGGIONE SANTOS
  • MEMBRES DE LA BANQUE :
  • IGOR JOSE BOGGIONE SANTOS
  • BOUTROS SARROUH
  • HILARIO CUQUETTO MANTOVANI
  • Data: 14 sept. 2021


  • Afficher le Résumé
  • The presence of bacterial biofilms in dairy products, in addition to increasing the rates of surface corrosion, reducing the efficiency of heat transfer, reducing the flow in the pipes, reducing the final quality of the product and generating economic losses, also causes diseases carried by food. Due to the large number of cases of diseases caused by contaminated food, chemical treatments are applied in an attempt to reduce this problem. Despite this, there are limitations regarding the use of these treatments and, with that, nanotechnology can be inserted in this area, as an important tool capable of revolutionizing processes and products, mitigating this problem. Therefore, this work aims to compare the efficiency of sanitizers used by the food industry, such as sodium hypochlorite (HS), alkaline detergent LAT 300 PLUS, nitric acid (AN) and caustic soda (SC) in relation to silver nanostructures (AgNP) , chitosan (NQ) and zinc oxide (ZnOnano), in different concentrations, to control bacterial biofilms, from a simulation of the formation of Listeria monocytogenes and Pseudomonas fluorescens biofilms in stainless steel plates, over 12 days. It was observed a superiority in the growth of L. monocytogenes in relation to P. fluorescens. The nanosanitizers (AgNP, NQ and ZnOnano) were able to reduce the microbial load to a value acceptable by the World Health Organization (3.0 x 102 UFC · mL-1) until the 6th day of analysis, while the AN until the 4th day, and the other commercial sanitizers (HS, LAT, AN and SC) can be considered inefficient in any period of development of the biofilm. Also, in more advanced stages (after 12 days), commercial sanitizers showed a reduction of a maximum of 2.00 log cycles, while nanosanitizers were able to reduce between 3.00 to 7.59 log cycles. This result confirms the superior efficiency of nanostructures in the control of biofilms formed in dairy products.

8
  • RAICK SUEL PINHEIRO
  • SELECTIVE CATALYTIC COMBUSTION OF ACRYLONITRILE ON CATALYSTS (Co, Cu and Fe)-ZSM-5 and (Co, Cu and Fe)-BETA

  • Leader : MARCELO DA SILVA BATISTA
  • MEMBRES DE LA BANQUE :
  • JORGE DAVID ALGUIAR BELLIDO
  • MARCELO DA SILVA BATISTA
  • WAGNER LUIS DA SILVA FARIA
  • Data: 29 nov. 2021


  • Afficher le Résumé
  • A wide range of substances is considered toxic, harm the environment and are harmful to human health. Among these substances, Acrylonitrile has these characteristics that makes it a very dangerous pollutant, so the removal of this organic compound is necessary. Two methods are commonly applied for treatment, and among them, Selective Catalytic Combustion appears as a promising technique because it is possible to be operationalized at reduced temperatures in relation to the conventional method, and generates harmless products such as N2 and CO2. For this, a series of zeolytic catalysts (Co, Cu and Fe)-ZSM-5 and (Co, Cu and Fe)-Beta were prepared by the ion exchange method and evaluated in selective catalytic combustion of acrylonitrile (SCC-AN). Physical and chemical properties of these materials were characterized by XRD, TPR-H2 and UV-Vis spectroscopy. XRD analyses showed that the morphology of Beta and ZSM-5 zeolites were preserved. It was also possible to identify the presence of CuO in Cu-Beta and cu-ZSM-5 and Fe2O3 catalysts in Fe-Beta and Fe-ZSM-5 catalysts. For Co-Beta and Co-ZSM-5 it was not possible to identify cobalt oxide species, possibly they are interchanged and offsetting load in zeolites. Regarding the analysis of TPR-H2 it was possible to identify two or more reduction steps for the catalysts of (Cu and Fe)-Beta and (Cu and Fe)-ZSM-5. Uv-Vis showed bands related to Cu2+, CuO and [Cu-O-Cu]2+ for Cu-Beta and Cu-ZSM-5, while for Fe-Beta and Fe-ZSM-5 isolated ions of Fe3+, and Co-Beta and Co-ZSM-5 presented bands related to Co2+. It was observed in the catalytic tests that the catalysts modified with Fe were the most active, where Fe3+ species were the main active sites of SCC-AN. Regarding selectivity at N2 and CO2, (Fe and Co)-ZSM-5 showed better results, however, this presented traces of NO and N2O. Therefore, it is possible to infer that Fe-ZSM-5 presented the best results for SSC-AN because it could combine good conversion, reduced temperature, high selectivity to N2 and CO2 and low formation of undesirable by-products. The other catalysts were somehow less selective to N2 and CO2, or generated some kind of secondary pollution.

2020
Thèses
1
  • BRUNA CARLA SANTOS SILVEIRA
  • TREATMENT OF ACETONITRILE EMISSIONS ON CATALYSTS (Cu, Co or Fe)-ZSM-5 AND (Cu, Co or Fe)-BETA

  • Leader : MARCELO DA SILVA BATISTA
  • MEMBRES DE LA BANQUE :
  • HENRIQUE DOS SANTOS OLIVEIRA
  • JORGE DAVID ALGUIAR BELLIDO
  • MARCELO DA SILVA BATISTA
  • Data: 12 juin 2020


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  • The Selective Catalytic Oxidation stands out as a more energy efficient and selective method than traditional combustion. This method consists in the use of catalysts in the combustion reaction, which reduces the required temperatures and the formation of byproducts. This work aimed to study (Cu, Fe, Co)-ZSM-5 and (Cu, Fe, Co)-Beta catalysts in the selective catalytic oxidation of acetonitrile to decrease traditional combustion temperature (> 850ºC) and to raise selectivity to N2. The catalysts were prepared by three consecutive ion exchanges and characterized by the methods of XRD, XRF, TPR-H2, TPD and UV-VIS spectroscopy. The XRD analysis showed, by measuring the intensity of the peaks, that the ion exchange did not influence the crystallinity of zeolitic structure. The results showed the presence of CuO in the Cu-ZSM-5 and Cu-Beta catalysts and Fe2O3 in the Fe-ZSM-5 and Fe-Beta catalysts. The absence of cobalt oxides in the Co-ZSM-5 and Co-Beta catalysts indicated that most cobalt species is interchanged in the zeolite structure. The TPR-H2 profiles showed that (Cu, Fe)-ZSM-5 and (Cu, Fe)-Beta catalysts showed reductions of copper and cobalt species in more than one step. The spectroscopy analysis in UV-VIS identified the presence of Cu2+, (Cu-O-Cu)2+,Fe3+, Co2+ and Co3+ ions in compensation position on zeolites prepared with these metals. As well as, identified nanoparticles of CuO and Fe2O3, in the catalysts (Cu, Fe)-ZSM-5 and (Cu, Fe)-Beta. The catalytic tests revealed that Cu-ZSM-5 and Cu-Beta were more active for acetonitrile oxidation. The Cu-Beta leaded to the formation of only interest’s products, standing out as the most suitable catalyst for the selective catalytic oxidation of acetonitrile. According to the DRX, TPR and UV-VIS spectroscopy results for Cu-Beta most copper species are present as dispersed CuO nanoparticles acting as the active center. They were responsible for increasing their conversion and preferential formation of N2 and CO2.

2
  • CARLOS ALBERTO DOS SANTOS VAZ
  • LANDFILL LEACHATE TREATMENT PROCESS THROUGH COAGULATION-FLOCCULATION AND CATALYTIC OZONATION


  • Leader : FABIANO LUIZ NAVES
  • MEMBRES DE LA BANQUE :
  • ALEXANDRE BOSCARO FRANCA
  • FABIANO LUIZ NAVES
  • PATRICIA DA LUZ MESQUITA
  • MESSIAS BORGES SILVA
  • Data: 7 juil. 2020


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  • Landfill leachate contains a high concentration of recalcitrant organic matter, such as humic substances (HS), ammoniacal nitrogen (N-NH3) and other substances with a high polluting potential in receiving streams. It has been proven that treatments based on biological processes and combined with sewage treatment are not effective in adapting it to the disposal standards required by environmental legislation. In this context, the present study aimed to propose and evaluate a treatment process combined with coagulation-flocculation and catalytic ozonation in a Rotating Packed Bed Reactor (RPB), in the landfill leachate in the city of Conselheiro Lafaiete, Minas Gerais. Response surface methodology was used to model the problem and Normal Boundary Intersection (NBI) was used to determine the optimized process conditions. The pH, agitation speed and dosage of ferric chloride, as a coagulant in Jar test, were analyzed in order to reduce the chemical oxygen demand (COD) and the total organic carbon (TOC). The conditions of the variables that provided the best treatment with coagulation-flocculation were pH 4,7, 40 rpm and 0,8 g L-1 of FeCl3, reducing on average 34% and 46% of COD and TOC, respectively. This was the starting point for the treatment with ozonation catalyzed by MgO supported on granulated activated carbon (GAC) in RPB. The reactions were carried out in a reactor with a useful volume of 0,25 L, powered by an ozone generator and 1 g of catalyst mass at a time, for 3 h. The leachate pH, reactor agitation speed and ozone flow were evaluated to determine COD, TOC, inorganic carbon (IC), N-NH3 and Abs254 removals. In catalytic ozonation, removals of 63% COD, 78% TOC, 68% N-NH3 and 41% Abs254 were obtained. Starting from the optimized conditions for the treatment processes obtained in this work and the rate of generation and organic load for the leachate of the studied landfill leachate, the dimensioning for the extrapolation from laboratory scale to real scale was performed, as an effective solution for a common problem in conventional treatment processes for this effluent.

3
  • BRUNNA D ONOFRE COUTO
  • PRODUCTION OF FRESH MINAS CHEESE WITH REDUCED SODIUM CONTENT AND SUPPLEMENTED WITH QUERCETIN AND VITAMIN B2 ENCAPSULATED IN β-LACTOGLOBULIN NANOSTRUCTURES

  • Leader : IGOR JOSE BOGGIONE SANTOS
  • MEMBRES DE LA BANQUE :
  • DANIELA LEITE FABRINO
  • DELAINE MEIRELES GOUVÊA BOGGIONE
  • DEMIAN PATRICK FABIANO
  • IGOR JOSE BOGGIONE SANTOS
  • Data: 14 juil. 2020


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  • Excessive consumption of salt can lead to health adversities. Therefore, there was a determination of sodium reduction by the Ministry of Health to the industries. Thus, the dairy industry seeks promising alternatives for reducing and / or replacing sodium, without changing the quality of the final product. Therefore, the objective of this work was to produce Minas fresh cheese supplemented with β-lactoglobulin (β-lg) nanostructures with and without bioactives - quercetin and vitamin B2 - reducing the sodium content and improving  food functionally. The cheeses were recovered via central rotational composite design (DCCR) 23, with the independent variables being concentrations of NaCl, KCl and β-lg nanostructure, with three repetitions at the central point. Subsequently, the functional improvement of the food was carried out the encapsulation of the bioactive quercetin and vitamin B2. As synthesized nanostructures, average size of 109.95 ± 0.68 nm and polydispersity index (PDI) of 0.4078 ± 0.0539. Stored at 4 ° C for 60 days, they maintained the values of size and zeta potential (-18.1 ± 1.1 mV), featuring a semi-stable colloidal system. The nanostructures sparkling and emulsifying properties improved, when compared to protein in its native form. It was possible to encapsulate the bioactive quercetin and vitamin B2 to the β-lg nanostructure, such as 96.50% and 36.39% efficiency, respectively. In the Minas fresh cheese produced, the variables pH, total soluble solids, titratable acidity, firmness, cohesiveness, elasticity, hardness and chewability were not statistically relevant for the model, however, when compared to nanostructure-free cheeses, odd 60.12 % reduction in lactic acid values and 47.64% and 49.03% increase in upper and lateral firmness values, respectively. Conductivity and adhesiveness were statistically significant, with KCl and NaCl being the most influential factor, respectively. The cheeses available with nanostructure and bioactive are not transferred in physical-chemical and texture properties. It is a promising alternative to the reduction of NaCl, since the replacement of 50% of NaCl by KCl of this work concomitantly with the addition of the nanostructure maintained the physical-chemical and rheological properties of the product.

4
  • DIEGO BERTOLDO FRANCISCO
  • EXPERIMENTAL AND COMPUTATIONAL ANALYSIS OF INTERDIFUSION LAYER IN THE INTERFACE C-MN / INCONEL 625

  • Leader : EDUARDO PRADO BASTON
  • MEMBRES DE LA BANQUE :
  • VICENTE BRAZ DA TRINDADE FILHO
  • EDUARDO PRADO BASTON
  • JUAN CANELLAS BOSCH NETO
  • Data: 15 juil. 2020


  • Afficher le Résumé
  • In the oil and gas industry, C-Mn steel pipes are used very often, in many stages of the process of extraction and conduction of oil, being applied as casing for wells. Those applications reach great depths where the operations are more complex due to internal and external efforts in addition to corrosion that is enhanced by high concentrations of hydrogen sulphide ( ) and carbon dioxide ( ) that are present in oil. With the purpose of understanding this demand, it was necessary to search for new materials and processes of production that have aspects of resistance to mechanical efforts and corrosion, in order to guarantee the security in the operations, preventing environmental impacts. In this context this study was conducted using samples of C-Mn steel pipes coated with a nickel-based super alloy denominated Inconel 625. The materials were prepared by thermal spraying, combining the thermal treatment process, varying the time taken to heat (10, 30, 60 and 120 minutes) and temperature (950 and 1050 °C). After the experiment, microstructural analyses were performed, the pattern of chemical composition and mass fraction curves were analyzed. According to the results, a mathematical model was developed from Flick’s Second Law, which was applied to a software of simulation, for the validation of the results obtained in the laboratory to estimate the diffusion coefficients of each element (Fe, Ni and Cr) present in the samples, in the interface area between substrate and coating. The results show that the increase of temperature during the process of thermal treatment increased the interdiffusion region between substrate and coating and the differences found in the diffusion coefficients of Fe, Ni e Cr, present in the samples, in correlation with studies of the literature related to the subject, are connected to two factors: the presence of different elements and concentrations in the material, interfering in the movement of the studied compounds and also the diffusion on grain boundary that, because of structural disorderly arrangements interfere directly in the resistance to transportation, consequently, in the results of diffusion coefficients.

5
  • DIEGO BERTOLDO FRANCISCO
  • EXPERIMENTAL AND COMPUTATIONAL ANALYSIS OF INTERDIFUSION LAYER IN THE INTERFACE C-MN / INCONEL 625

  • Leader : EDUARDO PRADO BASTON
  • MEMBRES DE LA BANQUE :
  • EDUARDO PRADO BASTON
  • JUAN CANELLAS BOSCH NETO
  • VICENTE BRAZ DA TRINDADE FILHO
  • Data: 15 juil. 2020


  • Afficher le Résumé
  • In the oil and gas industry, C-Mn steel pipes are used very often, in many stages of the process of extraction and conduction of oil, being applied as casing for wells. Those applications reach great depths where the operations are more complex due to internal and external efforts in addition to corrosion that is enhanced by high concentrations of hydrogen sulphide ( ) and carbon dioxide ( ) that are present in oil. With the purpose of understanding this demand, it was necessary to search for new materials and processes of production that have aspects of resistance to mechanical efforts and corrosion, in order to guarantee the security in the operations, preventing environmental impacts. In this context this study was conducted using samples of C-Mn steel pipes coated with a nickel-based super alloy denominated Inconel 625. The materials were prepared by thermal spraying, combining the thermal treatment process, varying the time taken to heat (10, 30, 60 and 120 minutes) and temperature (950 and 1050 °C). After the experiment, microstructural analyses were performed, the pattern of chemical composition and mass fraction curves were analyzed. According to the results, a mathematical model was developed from Flick’s Second Law, which was applied to a software of simulation, for the validation of the results obtained in the laboratory to estimate the diffusion coefficients of each element (Fe, Ni and Cr) present in the samples, in the interface area between substrate and coating. The results show that the increase of temperature during the process of thermal treatment increased the interdiffusion region between substrate and coating and the differences found in the diffusion coefficients of Fe, Ni e Cr, present in the samples, in correlation with studies of the literature related to the subject, are connected to two factors: the presence of different elements and concentrations in the material, interfering in the movement of the studied compounds and also the diffusion on grain boundary that, because of structural disorderly arrangements interfere directly in the resistance to transportation, consequently, in the results of diffusion coefficients.

6
  • SARAH ARAÚJO VALVERDE
  • BORON REMOVAL FROM SYNTHETIC SAMPLE BY ADSORPTION ONTO BOVINE BONE CHAR USING NORMAL BOUNDARY INTERSECTION AS MULTIVARIATED OPTIMIZATION METHOD

  • Leader : PATRICIA DA LUZ MESQUITA
  • MEMBRES DE LA BANQUE :
  • PATRICIA DA LUZ MESQUITA
  • IGOR JOSE BOGGIONE SANTOS
  • FABIANO LUIZ NAVES
  • KÁTIA CECÍLIA DE SOUZA FIGUEIREDO
  • Data: 2 oct. 2020


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  • Boron is an essential micronutrient for plants, humans and animals, which is also an important component used in various industries. Along with the widespread of boron application, more and more boron waste pollutes the drinking water sources, and leads to a series of environment and health problems. Boron contaminations are aggravated by the fact that it cannot be removed by conventional water treatments and its separation still remains an issue. In this context, the goal of this paper was to explore boron removal in a synthetic effluent through the adsorption process in bovine bone char. Design of experiments was carried out using the Central Composite Design (CCD). Optimization was carried out by Generalized Reduced Gradient (GRG) and Normal Border Intersection (NBI) methods. At initial effluent pH of 7.72, solid-liquid ratio of 59.95 gbone char.kg-1effluent and an initial boron concentration of 18.63 mg.L-1, it was possible to reach 43% of boron removal, with a variance of 2%². Steam pre-treatment for bone char was also evaluated and neither caused significant structural changes in the adsorbent nor influenced the adsorption of boron. The equilibrium study showed that Freundlich and Henry models described better the system, compared to Langmuir, Temkin and Langmuir-Freundlich isotherms, suggesting a reversible process. Pseudo-second order adsorption kinetics model best fitted experimental data and the thermodynamic parameters revealed an endothermic (ΔH = +15.17 kJ.mol-1), spontaneous and controlled by entropy (ΔS = +0.07 kJ.mol-1.K-1) process.

7
  • KAREN SARTORI JEUNON GONTIJO
  • BIODEGRADATION OF VEGETABLE OIL BY FILAMENT FUNGI AND PROCESS MODELING

  • Leader : EDSON ROMANO NUCCI
  • MEMBRES DE LA BANQUE :
  • EDSON ROMANO NUCCI
  • ENIO NAZARE DE OLIVEIRA JUNIOR
  • ANA PAULA FONSECA MAIA DE URZEDO
  • KARINA ARRUDA ALMEIDA
  • Data: 3 nov. 2020


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  • Technological developments have provided several benefits, such as ease of communication, transportation, among others. However, along evolution came environmental degradation due to improper disposal of cooking oil. The objective of this work was to use filamentous fungi for the biodegradation of cooking oil and jointly carry out the process modeling using an intelligent system. To carry out the experiments, a synthetic medium and four filamentous fungi were used, which three showed enzymatic production (P. crysogenum, P. aculeatus and A. niger). After enzymatic production test, the fungi that produced the enzyme of interest in the oil were A. niger and P. aculeatus (where the value was 0.6 g.L-1 and approximately 0.4 g.L-1 respectively). With those better results, they passed through the growth curve stage and P. aculeatus showed the best growth result (approximately 0.38 g.L-1). In the process modeling stage, it is used fuzzy logic aiming to obtain as a result the growth of the fungus and biodegradation, and thus to make a comparison with the experimental data. Through the results, it can be observed that the data presented in the laboratory were consistent with the results presented by the fuzzy logic.

8
  • ANA PAULA SILVA ARTUIR
  • EVALUATION OF CORROSION BY IMMERSION AND SIMULATION TESTS IN WELDED JOINTS OF STAINLESS STEEL LEAN DUPLEX UNS S32304

  • Leader : DALILA MOREIRA DA SILVEIRA
  • MEMBRES DE LA BANQUE :
  • DALILA MOREIRA DA SILVEIRA
  • EDSON ROMANO NUCCI
  • VANESSA DE FREITAS CUNHA LINS
  • Data: 24 nov. 2020


  • Afficher le Résumé
  • Duplex stainless steels are constituted by an approximately equal volumetric mixture of austenite and ferrite and because of their high resistance to corrosion, their applicability has increased in the daily life of industries. The lean duplex stainless steel UNS S32304, study material in this research, when compared to other types of duplex stainless steels, has a relatively lower cost of obtaining, due to the partial substitution of nickel for nitrogen as an alloy element. This work hat to objective analyze the corrosion resistance of lean duplex stainless steel UNS S32304 in time 4 and 8 months immersed in a 3.5%m/v NaCl solution using electrochemical techniques and anodic potentiodynamic polarization and electrochemical impedance in welding processes GMAW, FCAW, SMAW and the base metal. The results demonstrate that the corrosion potential of the joints welded by the GMAW process showed higher values, indicating the smallest tendency of corrosion of these samples, when compared to the other welding processes, this probably occurred due to the lower level of non-metallic inclusions of the GMAW process. As for the corrosion rate test, it was noticed that all samples had a degree of corrosivity at least moderate, except the base metal, which had a low degree of corrosivity. The samples that had the elevated corrosion rate were those of the FCAW weld, demonstrating the environment this studied was more corrosive for samples welded by this process. In the simulated results when compared to those obtained experimentally and with the literature they were consistent, however in the simulated part it is not possible to identify which type of weld and therefore this information is only obtained experimentally, but the simulation was very important, as it presents general information of the corrosive process and its application under specific conditions brings results similar to those found experimentally in a much shorter return time. This simulation process still allows a general notion of the corrosion behavior in the same experimental condition with two different materials.

9
  • MICHELLE LAYRA CUNHA REZENDE
  • ADAPTATION OF THE 5220-D STANDARD METHODS METHODOLOGY FOR THE DETERMINATION OF THE CHEMICAL DEMAND FOR OXYGEN (COD), WITHOUT DIGESTION BY ARTIFICIAL HEATING OF THE SAMPLE

  • Leader : FABIANO LUIZ NAVES
  • MEMBRES DE LA BANQUE :
  • CRISTIANE MEDINA FINZI QUINTAO
  • FABIANO LUIZ NAVES
  • LARISSA CARVALHO SOARES AMARAL
  • Data: 27 nov. 2020


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  • Chemical oxygen demand (COD) is a global parameter used as an indicator of organic content in wastewater and surface water as well as for the monitoring of wastewater treatment plants. Thus, the new method proposed for analyzing COD in samples aims to contribute and facilitate the process of determining organic matter in wastewater treatment plants in order to save costs and time.
    Currently, the method used to determine the Chemical Oxygen Demand (COD) most used for closed reflux is the Standard Methods 5220D Methodology, in which tubes with samples containing potassium biftalate, mercury sulfate, potassium dichromate and distilled water are carried out. a digester and then left to cool before their respective absorbances are measured and their COD calculated. This process has some disadvantages regarding digestion, as samples must be digested for a period of approximately 2 hours before reading their absorbances.
    In order to optimize the analysis time of this method, the present utility model was developed, whereby the absorbances of the samples are obtained through an equation that correlates the absorbances of the samples right after their oxidation, without going through the process of digestion.
    In addition, it is also proposed to validate the methodology through tests of accuracy, precision, robustness, linearity, selectivity and sensitivity independent of the organic material to be analyzed. The main advantage of this model is the saving of time, expenses with the purchase of the equipment and also the reduction of electrical energy, due to the non-use of the digestor block.

10
  • GABRIELLE PÂMELA SILVA PINTO
  •  

    REMOVAL OF FLUORIDE FROM COKING COAL PRODUCTION WASTEWATER BY ADSORPTION ONTO BONE CHAR

  • Leader : PATRICIA DA LUZ MESQUITA
  • MEMBRES DE LA BANQUE :
  • PATRICIA DA LUZ MESQUITA
  • EDUARDO PRADO BASTON
  • ELBERT MULLER NIGRI
  • Data: 11 déc. 2020


  • Afficher le Résumé
  • Fluoride has become a challenge for some industrial sectors such as steel, due to its high load over some processes, which requires specific treatment for removal. In this context, this study aimed at investigating the adsorption capacity of bovine bone char to remove fluoride from real coke production wastewater. Central Composite Design (CCD) as well as a Mixture Design were performed to set the best conditions of pH and solid / liquid ratio to improve fluoride percentage removal and bone char adsorptive capacity. Desirability method was used for optimization of the results. Bovine bone char, particle size 12 to 32 mesh (0.5 to 1.4 mm), mesoporous structure, showed great potential for fluoride removal from steel wastewater, especially under previous acid pre-treatment. A 75% increase in its surface area (145.91 m².g- 1), compared to non-treated bone char (83.33 m².g-1), allowed greater access of fluoride onto the active sites for hydroxyapatite (HAP) phosphate exchange. At 20.0 g pre- treated bovine bone char.Kg- 1 effluent, adsorptive capacity achieved 3.24 mg.g-1, representing an increase of 42%, compared to non-treated bone char. Equilibrium was well represented by Freundlich model, revealing the formation of multiple heterogeneous layers on bone char surface. Adsorption kinectis was favored (as it was possible to remove up to 75% of fluoride in the first hour of adsorbent-adsorbate contact) and pseudo-second order modeled. Thermodynamics parameters estimation indicates an endothermic (ΔH = + 28.357 KJ. mol-1), spontaneous (ΔG = -15,291 KJ.mol-1; ΔG = - 17,052 KJ.mol-1; ΔG = -18,212 KJ.mol-1) and entropy favored (ΔS = + 0.146 kJ. mol- 1.K-1) process.

2019
Thèses
1
  • DIÊGO HENRIQUÊS AGUIAR DE MELO
  • OTIMIZAÇÃO DO TRATAMENTO DE LIXIVIADO DE ATERRO SANITÁRIO VIA OZONIZAÇÃO EM REATOR DE LEITO GIRATÓRIO EM ESCALA DE BANCADA

  • Leader : FABIANO LUIZ NAVES
  • MEMBRES DE LA BANQUE :
  • BOUTROS SARROUH
  • FABIANO LUIZ NAVES
  • MATEUS DE SOUZA AMARAL
  • PATRICIA DA LUZ MESQUITA
  • Data: 29 mai 2019


  • Afficher le Résumé
  • In most countries the landfill leachate is used to deal with the solid waste that does not have another use. Despite numerous advantages, the leachate generation is a present concern both for its volume generated and for its chemical composition. Due to the high organic matter content and toxic compounds that microorganisms cannot metabolize, biological treatment may be impaired. It is necessary to elaborate an inexpensive and accessible pre-treatment in order to reduce the concentration of these harmful compounds, thus improving the efficiency of any subsequent biological treatments. The present work aimed to study the landfill leachate ozonization in a RPB (Rotating Packed Bed) reactor, its main variables and their interactions (bed rotation speed, pH and compressed air flowrate), as well as to find and optimum point and the biodegradability improvements. Vermiculite impregnated with iron was studied as a possible catalyst to the ozonation process in low pH aiming enhance the COD and color removals, responses studied in this work. Using experimental designing tools it was possible to analyses the variables, generate a mathematical model considered statistically valid (Radj=98%), and assure that the catalyst is significant to the process improving the responses. The optimal point, given by the method NBI (Normal Boundary Intersection), was fount using a speed rotation of 915 rpm, pH of 5.8 and an air flowrate of 3.9 L.min-1 , using 0.25 g.L-1 of vermiculite per volume of lendfill leachate in the reactor. The COD and color removals were 16.05% and 40.54% at the optimal point. The BOD5/COD raised from 0.13 to 0.49, proving that the proposed process increased the biodegradability of the landfill leachate. The variable analyses showed that the RPB reactor improved the gas diffusivity according to the rotation speed and the pH, along with the catalyst, are responsible to improve the COD removal by adding more hydroxyl radicals to the process in acid medium. Comparing with many researches, the proposed process was able to treat the landfill leachate improving its biodegradability using less resources and an affordable catalyst. Subsequent biological treatments may be applied to remove the remaining nutrients and excessive organic matter, but now with a higher effectiveness compared with the biological treatment performed in a non-treated leachate.

2
  • DAIANA DE MORAIS
  • Tratamento de lixiviado de aterro sanitário com extrato de flor de Musa sp. e otimização por meio do algoritmo de interseção normal de fronteira

  • Leader : FABIANO LUIZ NAVES
  • MEMBRES DE LA BANQUE :
  • FABIANO LUIZ NAVES
  • JUAN CANELLAS BOSCH NETO
  • MATEUS DE SOUZA AMARAL
  • PATRICIA DA LUZ MESQUITA
  • Data: 29 mai 2019


  • Afficher le Résumé
  • Due to the great problem in the emerging countries concerning solid waste disposal and the co-products generated from the decomposition that occurred during the "maturation" time of the leachate in landfills, it becomes necessary to search for technologies that mitigate the environmental impacts caused, when they are laid or disposed in an inapropriate manner. The present research aimed to evaluate the efficiency of the leachate treatment process, using the coagulation, flocculation and sedimentation technique, using a biocoagulant extracted from the Musa flower sp. The experiments were performed in standard equipment of Jar Test, adopting the factors of rotation, coagulant dosage and hydrogen - pH potential modeled by a response Central Composite Design (CCD). The coagulation process was performed in two stages, the first with the rotation being established according to the CCD and the second was held at 40 rpm. The process presented promising in the percentage reduction of organic load of 50.15% and 92.20% measured in terms of Chemical Oxygen Demand (COD) and turbidity, respectively, on the surface response. It was also observed that of the factors analyzed, pH and rotation had a greater influence on the final result. They were assessed individually as well as in their interactions. There was no lack of adjustment of the model since the value found was above 0.05 and this fits well to the experimental data, explained by means of the Adjusted R² value close to 99% for the two analyzed responses.The optimization process was performed according to the Normal Boundary Intersection (NBI), applied to multi-objective and multivariate processes, in the construction of a Pareto frontier that, in its turn, presented linear dependence between the functions and, consequently, correlation between the responses, strong and positive, and therefore the inversion of the border. However, it was necessary to remove this correlation and reverse the inversion to analyze the results obtained. Thus, it was observed the maximization of the removal of the analyzed, jointly, the minimization of the variability of the process

3
  • PAULO HENRIQUE DA SILVA
  • Treatment of acetonitrile emissions on catalysts (Cu, Co or Fe) -Beta and (Cu, Co or Fe) -oxides.


  • Leader : MARCELO DA SILVA BATISTA
  • MEMBRES DE LA BANQUE :
  • ANDRÉ GUSTAVO SATO
  • HENRIQUE DOS SANTOS OLIVEIRA
  • MARCELO DA SILVA BATISTA
  • Data: 4 juil. 2019


  • Afficher le Résumé
  • Treatment of acetonitrile emissions on catalysts (Cu, Co or Fe) -Beta and (Cu, Co or Fe) -oxides.


4
  • ANA PAULA MAGALHAES PINTO
  • Evaluation of the influence of P25BM steel surface finish on corrosion resistance by PITE


  • Leader : DALILA MOREIRA DA SILVEIRA
  • MEMBRES DE LA BANQUE :
  • DALILA CHAVES SICUPIRA
  • DALILA MOREIRA DA SILVEIRA
  • DEMIAN PATRICK FABIANO
  • Data: 10 juil. 2019


  • Afficher le Résumé
  • Evaluation of the influence of P25BM steel surface finish on corrosion resistance by PITE


5
  • LUDMILA NASCIMENTO
  • Craft beer production using macauba residual cake (Acrocomia aculeata) and quality evaluation via Fuzzy logic


  • Leader : EDSON ROMANO NUCCI
  • MEMBRES DE LA BANQUE :
  • ANA PAULA FONSECA MAIA DE URZEDO
  • EDSON ROMANO NUCCI
  • KARINA ARRUDA ALMEIDA
  • Data: 12 juil. 2019


  • Afficher le Résumé
  • Craft beer production using macauba residual cake (Acrocomia aculeata) and quality evaluation via Fuzzy logic


6
  • GUSTAVO CARDOSO DA MATA
  • Ni / Y2O2 - Y2O3 catalysts synthesized from one-step polymerization: polymeric precursor effect

  • Leader : JORGE DAVID ALGUIAR BELLIDO
  • MEMBRES DE LA BANQUE :
  • JORGE DAVID ALGUIAR BELLIDO
  • KARINA ARRUDA ALMEIDA
  • MARCELO DA SILVA BATISTA
  • Data: 15 juil. 2019


  • Afficher le Résumé
  • Ni / Y2O2 - Y2O3 catalysts synthesized from one-step polymerization: polymeric precursor effect

7
  • MARCELO DE CASTRO KNOP
  • Study of the influence of sucrose, orange peel and elephant grass charcoal as organic additives on the metallurgical properties of iron ore pellets.


  • Leader : ALEXANDRE BOSCARO FRANCA
  • MEMBRES DE LA BANQUE :
  • ALEXANDRE BOSCARO FRANCA
  • GUILHERME LIZIERO RUGGIO DA SILVA
  • JESSIKA MARINA DOS SANTOS
  • RENATA CAROLINA ZANETTI LOFRANO
  • Data: 15 juil. 2019


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  • Study of the influence of sucrose, orange peel and elephant grass charcoal as organic additives on the metallurgical properties of iron ore pellets.


8
  • KARINE ROCHA XAVIER
  • Cerium-niobium, magnesium-niobium catalysts applied in the aniline oxidation reaction


  • Leader : EDUARDO PRADO BASTON
  • MEMBRES DE LA BANQUE :
  • DEMIAN PATRICK FABIANO
  • EDUARDO PRADO BASTON
  • HUMBERTO VIEIRA FAJARDO
  • JORGE DAVID ALGUIAR BELLIDO
  • Data: 16 juil. 2019


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  • Cerium-niobium, magnesium-niobium catalysts applied in the aniline oxidation reaction


9
  • BRUNA SILVA KANSAON
  • Comportamento Termodinâmico de Hidrogéis Superabsorventes resultantes da Copolimerização de Acrilamida, Metacrilato de sódio e N,N’-metilenobisacrilamida

  • Leader : JORGE DAVID ALGUIAR BELLIDO
  • MEMBRES DE LA BANQUE :
  • IGOR JOSE BOGGIONE SANTOS
  • JORGE DAVID ALGUIAR BELLIDO
  • MARIA ELISA SCARPELLI RIBEIRO E SILVA
  • ROBERTO FERNANDO DE SOUZA FREITAS
  • Data: 19 juil. 2019


  • Afficher le Résumé
  • In this work, the thermodynamic behavior of superabsorbent hydrogels was studied. The hydrogels were synthesized through the copolymerization of acrylamide, sodium methacrylate and N,N’-methylenebisacrylamide (crosslinking agent). Ammonium persulfate was used as initiator and N,N,N’,N’- tetramethylenediamine as accelerator. A total of thirty-six gels were obtained by varying the total monomer concentration (from 10%w/v to 30%%w/v), the crosslinking agent (from 0.38%w/w to 1.43%w/w) and the ionic monomer concentration (from 0%w/w to 57.2%w/w). The hydrogels were swollen in water, at 25oC and pH equals 6.5, and the degree of swelling, at equilibrium, were determined. From the total, twenty-nine hydrogels presented a degree of swelling over 100g/g, which means that they can be considered as superabsorbent polymers (SAPs). Two of them had a degree of swelling over 530g/g. The presence of the ionic monomer is essential for a higher water absorption. The results, obtained by keeping the total monomer and the crosslinking agent concentration constant, and by increasing the ionic monomer concentration, were thermodynamically consistent, showing the non- anomalous behavior of the gels. All the results were qualitatively discussed, considering the compromise among the syntheses parameters in the determination of the polymer network structure as well as the correlation of such structure and the thermodynamic behavior. In order to establish this correlation, as a contribution to the state of the art, concerning the subject, it was proposed a completely different approach, compared to the one that is usually carried out. The thermodynamic behavior was described by introducing a concept of “entropy stock”. The variables that, separately, most influence such “entropy stock” are the crosslinking density and the total monomer concentration. The ionic content of the polymer chains, greatly, influence, separately, the “entropy stock”, up to a certain level. Over such level, it is modulated by the other variables. Considering the thermodynamic approach that was taken, the obtained results allow, with a reasonable certainty, the synthesis of “tailor-made” hydrogels, with specific degrees of swelling, for specific applications.

10
  • DENNIS JÚNIOR LARA FALEIRO DE REZENDE
  • Study of zirconia nickel catalysts promoted with lanthanum, used in dry methane reform

  • Leader : JORGE DAVID ALGUIAR BELLIDO
  • MEMBRES DE LA BANQUE :
  • EDUARDO PRADO BASTON
  • JORGE DAVID ALGUIAR BELLIDO
  • VINICIUS DANTAS DE ARAUJO
  • Data: 20 juil. 2019


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  • Study of zirconia nickel catalysts promoted with lanthanum, used in dry methane reform

11
  • LUIZ GUSTAVO DA CUNHA SILVA
  • Conversion of ethanol to 1,3-butadiene with MgO / CuO / SiO 2 and MgO / CuO / [Si] MCM-48 catalysts


  • Leader : DEMIAN PATRICK FABIANO
  • MEMBRES DE LA BANQUE :
  • ANA PAULA FONSECA MAIA DE URZEDO
  • DEMIAN PATRICK FABIANO
  • KARINA ARRUDA ALMEIDA
  • Data: 23 juil. 2019


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  • Conversion of ethanol to 1,3-butadiene with MgO / CuO / SiO 2 and MgO / CuO / [Si] MCM-48 catalysts


12
  • GUILHERME AMORIM GOMES
  • Computer vision system for level measurement and classification of fluidized bed operation regimes.


  • Leader : GUSTAVO MATHEUS DE ALMEIDA
  • MEMBRES DE LA BANQUE :
  • BRUNO HENRIQUE GROENNER BARBOSA
  • EDGAR CAMPOS FURTADO
  • GUSTAVO MATHEUS DE ALMEIDA
  • LEONARDO ADOLPHO RODRIGUES DA SILVA
  • Data: 30 sept. 2019


  • Afficher le Résumé
  • Computer vision system for level measurement and classification of fluidized bed operation regimes.


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