ADSORPTION OF CONGO RED DYE BY HYDROPHOBIC O-CARBOXYMETHYL CHITOSAN DERIVATIVES

作者：Debrassi Aline^*; Tonelli Largura Maria Claudia; Rodrigues Clovis Antonio

来源：Quimica Nova, 2011, 34(5): 764-770.

• adsorption
• congo red
• O-carboxymethylchitosan

ADSORPTION OF CONGO RED DYE BY HYDROPHOBIC O-CARBOXYMETHYL CHITOSAN DERIVATIVES. 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 Delta H-o) and favorable (negative Delta G(o)). The hydrophobic derivatives are able to adsorb the dye even in high pH values.

• 出版日期2011