Banca de DEFESA: RODRIGO GERALDO TEIXEIRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : RODRIGO GERALDO TEIXEIRA
DATE: 10/02/2023
TIME: 14:00
LOCAL: meet.google.com/fms-etco-dex
TITLE:

USE OF RECYCLED LITHIUM ION CATHODE BATTERIES IN THE ADSORPTION OF METHYLENE BLUE DYE

KEY WORDS:

Adsorption, Methylene blue, Li-ion battery, recycling

PAGES: 76
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Físico-Química
SUMMARY:

In this work, two major environmental problems were addressed: the improper disposal of Li-ion batteries and the treatment of effluents contaminated by dyes. For this, the adsorption capacity of the methylene blue in aqueous solution was evaluated. The adsorbent used was the recycled cathode from Li-ion batteries. The in natura cathode and the cathode subjected to heat treatment at 100 °C and 200 °C were tested in methylene blue solutions under different conditions. The cathode was characterized by scanning electron microscopy, thermogravimetric analysis and X-ray diffraction. The UV-vis spectroscopy identified that the rate of monomers and dimers adsorption depends on parameters such as temperature, dye solution concentration and pH. The monomer adsorption followed the Langmuir isotherm with a maximum adsorption capacity of 75.42 mg/g at 25 °C. The statistical study with factorial design 23 showed that the monomer adsorption is influenced by methylene blue initial concentration, temperature and pH,  while the predominant factor of adsorption of the dimer was the methylene blue  initial concentration, (all parameters at the 95% level of significance). The thermodynamic parameters showed that the adsorption process studied is endothermic, with positive entropy. Adsorption was not spontaneous at 25 °C, becoming spontaneous with increasing temperature to 30 °C and 35 °C for the methylene blue initial concentration of 200 ppm. Therefore, the results of the work demonstrate that the recycled cathode has a high potential to be used as an adsorbent material for methylene blue, including for selective adsorption of monomer and dimer groups.

BANKING MEMBERS:
Presidente - 2434901 - HOSANE APARECIDA TAROCO
Interno - 1534989 - JULIO ONESIO FERREIRA MELO
Externo à Instituição - TULIO MATENCIO - UFMG