O emprego de quitosana quimicamente modificada com anidrido succínico na adsorção de azul de metileno


Autoria(s): Lima, Ilauro S.; Ribeiro, Emerson S.; Airoldi, Claudio
Contribuinte(s)

Universidade Estadual de Campinas

Data(s)

01/06/2006

03/12/2015

03/12/2015

Resumo

The adsorption capacity of alpha-chitosan and its modified form with succinic anhydride was compared with the traditional adsorbent active carbon by using the dye methylene blue, employed in the textile industry. The isotherms for both biopolymers were classified as SSA systems in the Giles model, more specifically in L class and subgroup 3. The dye concentration in the supernatant in the adsorption assay was determined through electronic spectroscopy. By calorimetric titration thermodynamic data of the interaction between methyene blue and the chemically modified chitosan at the solid/liquid interface were obtained. The enthalpy of the dye/chitosan interaction gave 2.47 ± 0.02 kJ mol-1 with an equilibrium constant of 7350 ± 10 and for the carbon/dye interaction this constant gave 5951 ± 8. The spontaneity of these adsorptions are reflected by the free Gibbs energies of -22.1 ± 0.4 and -21.5 ± 0.2 kJ mol-1, respectively, found for these systems. This new adsorbent derived from a natural polysaccharide is as efficient as activated carbon. However 97% of the bonded dye can be eluted by sodium chloride solution, while this same operation elutes only 42% from carbon. Chitosan is efficient in dye removal with the additional advantage of being cheap, non-toxic, biocompatible and biodegradable.

501

506

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Identificador

Química Nova. Sociedade Brasileira de Química, v. 29, n. 3, p. 501-506, 2006.

0100-4042

S0100-40422006000300018

10.1590/S0100-40422006000300018

http://dx.doi.org/10.1590/S0100-40422006000300018

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422006000300018

http://www.repositorio.unicamp.br/jspui/handle/REPOSIP/23715

http://repositorio.unicamp.br/jspui/handle/REPOSIP/202409

Idioma(s)

pt

Publicador

Sociedade Brasileira de Química

Relação

Química Nova

Direitos

aberto

Fonte

SciELO

Palavras-Chave #chitosan #succinic anhydride #methylene blue
Tipo

Artigo de periódico