Abstract
N, O-carboxymethyl-chitosans ( N, O-CMC) with different degree of substitution (DS) were synthesized under heterogeneous conditions by controlling the reaction temperature. The factors influencing adsorption capacity of N, O-CMC such as the DS of N, O-CMC, initial pH value of the dye solution and adsorption temperature for anionic dye congo red (CR) were investigated. Compared with chitosan (78.90 mg/g), N, O-CMC with the DS of 0.35 exhibited much higher adsorption capacity (330.62 mg/g) for CR at the same adsorption conditions. The adsorption kinetics and isotherms showed that the sorption processes were better fitted by pseudo-second-order equation and the Langmuir equation, respectively. The adsorption mechanism of N, O-CMC was also discussed by means of IR and XPS spectra. The results in this study indicated that N, O-CMC was an attractive candidate for removing CR from the dye wastewater.
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