Banca de DEFESA: LARISSA AZEVEDO SOARES

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : LARISSA AZEVEDO SOARES
DATE: 21/12/2023
TIME: 15:00
LOCAL: MODO REMOTO
TITLE:

Influence of treatment processes on the production of activated carbons from sugarcane bagasse and study of the optimization of the dye adsorption process through statistical analysis

KEY WORDS:

sugar cane, activated carbon, chemical activation, dye adsorption, factorial design.

PAGES: 75
BIG AREA: Engenharias
AREA: Engenharia Química
SUMMARY:

The present work aims to evaluate the influence of the process flow and chemical agents in the preparation and characterization of activated carbon (AC) having sugarcane bagasse as a precursor, to determine the efficiency of adsorption of the dyes Methylene Blue (AM ) and Erionyl Yellow A-R (EY), as well as using statistical techniques in order to evaluate and optimize the different parameters of the adsorption process of these dyes on activated carbon. In this study, 4 different types of activated carbon were obtained and these were characterized by the techniques of XRD, FRX, SEM and N2 Volumetry, Zeta Potential and ability to remove methylene blue dye (MA). The coal whose best results were obtained, reaching surface area values of about 1200 m2.g-1, was used in the other tests that followed with adsorption of dyes. The adsorption assays for AM were carried out by varying the CA mass, pH and temperature of the medium. Through the statistically obtained data, it was verified that the variables studied presented significant and predictive effects, within the range of experimental levels studied, extrapolating the reference line corresponding to the 95% confidence interval. It was also verified that the assay using 10mg of CA, at 27°C and pH 2 obtained the highest amount of dye adsorbed by activated carbon (q), reaching a value of up to 288.4 mg/g. Still for Methylene Blue, the equilibrium, kinetics and thermodynamic factors were studied, under the conditions optimized by the experimental design. As for the statistical studies with EY, they were performed by varying the pH and temperature of the medium. It was found that the variables studied showed only significant effects and that the test at 30°C and pH 2 obtained the highest amount of dye adsorbed by activated charcoal (q), reaching a value of 61.1 mg/g.

COMMITTEE MEMBERS:
Interno - 2929066 - ANDRE LUIS LOPES MORIYAMA
Interna - 1271737 - CAMILA PACELLY BRANDÃO DE ARAÚJO
Presidente - 349801 - CARLSON PEREIRA DE SOUZA
Externa à Instituição - MAYARA FELICIANO GOMES - UFPB
Externa à Instituição - SUYLAN LOURDES DE ARAÚJO DANTAS