Banca de QUALIFICAÇÃO: CAMILA COSTA PETROLEO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : CAMILA COSTA PETROLEO
DATA : 17/05/2022
HORA: 14:00
LOCAL: https://conferenciaweb.rnp.br/webconf/wagner-27
TÍTULO:

Identification and quantification of acid groups present on the surface of carbons

PÁGINAS: 24
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Físico-Química
ESPECIALIDADE: Química de Interfaces
RESUMO:

The surface chemistry of carbons is largely determined by the number and nature of surface functional groups. Although activated carbons are widely used as adsorbents and catalysts, their high cost of production has directed interest to so-called biochars, a low-cost alternative with comparable or even superior performance. A variety of biomass sources can be used, including agricultural residues or agro-industrial by-products such as rice husks, sugarcane bagasse, coffee beans, glycerin and sugars. The surface chemistry of carbons is largely determined by the number and nature of surface functional groups. Several functionalities can be inserted into the surface of these carbons, with emphasis on the acidic groups, responsible for a significant improvement in the adsorptive and catalytic properties of the solids. Thus, several procedures and studies have been carried out in the research group to optimize the insertion of acidic groups, both Brønsted and Lewis, on the surface of carbons. Once inserted, the acid groups need characterization, in order to differentiate between Lewis and Brønsted acids (considering here sulfonic, carboxylic, phenolic, lactones), as well as their acid strength, thermal stability and quantification. Each technique has its specific application, and the biggest problem associated with these measurements is in the absolute quantification of acidic or basic sites, which is often limited to relative comparisons between samples. Thus, the objective of this work is to investigate the best conditions and limitations of the techniques Boehm titration and Chromatography with microanalytical pyrolysis for a qualitative and quantitative analysis of Brønsted and Lewis acid sites present on carbon surfaces.

MEMBROS DA BANCA:
Presidente - Interno ao Programa - 1601156 - WAGNER ALVES CARVALHO
Membro Titular - Examinador(a) Interno ao Programa - 1933328 - HELOISA FRANCA MALTEZ
Membro Titular - Examinador(a) Interno ao Programa - 2145401 - DIOGO LIBRANDI DA ROCHA
Membro Suplente - Examinador(a) Interno ao Programa - 1623562 - RODRIGO LUIZ OLIVEIRA RODRIGUES CUNHA