Adsorção do corante vermelho congo por derivados da o-carboximetilquitosana hidrofobicamente modificados
AUTOR(ES)
Debrassi, Aline, Largura, Maria Claudia Tonelli, Rodrigues, Clóvis Antonio
FONTE
Química Nova
DATA DE PUBLICAÇÃO
2011
RESUMO
Hydrophobically modified O-carboxymethylchitosan derivatives were synthesized through a reaction with lauroyl chloride and applied for adsorption of congo red dye. The Langmuir-Freundlich isotherm model was found to be the most suitable one for the VC adsorption and maximum adsorption capacity obtained was 281.97 mg g-1 at a pH value of 7.0 for HL 1.0. The adsorption process follows the pseudo-second-order kinetics and the corresponding rate constants were obtained. The thermodynamic parameters showed that adsorption process is spontaneous (positive ∆Hº) and favorable (negative ∆Gº). The hydrophobic derivatives are able to adsorb the dye even in high pH values.
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