Notícias

Banca de QUALIFICAÇÃO: LUCINALDO DOS SANTOS SILVA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE: LUCINALDO DOS SANTOS SILVA
DATA: 28/02/2013
HORA: 08:30
LOCAL: Auditório do Departamento de Química
TÍTULO:

Dye anionic sorption in aqueous solution onto a cellulose surface chemically modified with aminoethanethiol


PALAVRAS-CHAVES:

Cellulose
Modification
Characterization
Adsorption
Anionic dye


PÁGINAS: 10
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Química Inorgânica
ESPECIALIDADE: Físico Química Inorgânica
RESUMO:

The natural biopolymer cellulose was initially chlorinated at the 6 carbon with a degree of substitution
(DS) 0.99 ± 0.01 and then reacted with aminoethanethiol to form a modified compound with different
basic centers, and this material was characterized by elemental analysis, XRD, TG, FTIR and 13C NMR.
The matrix obtained was effective in removing red reactive anionic dye in an aqueous medium at pH values of 2 and 9. The equilibrium time of adsorption obtained was approximately 100 min (pH 2) and
160 min (pH 9), and the kinetics for both systems followed a pseudo-second-order model. The adsorption isotherms at different pH levels at three different temperatures obeyed the Langmuir model, and the maximum adsorption capacities were 78 mg g-1 (pH 2) and 26 mg g-1 (pH 9), and the interaction was electrostatic and hydrogen bonds and/or covalent, respectively.


MEMBROS DA BANCA:
Presidente - 1553988 - EDSON CAVALCANTI DA SILVA FILHO
Interno - 1167321 - MARIA RITA DE MORAIS CHAVES SANTOS
Interno - 1508806 - WELTER CANTANHEDE DA SILVA
Notícia cadastrada em: 20/02/2013 16:56
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