Abstract:In this research, carboxylic functional group was introduced into the fibre backbone of peel dreg of Chinese water chestnut by succinic anhydride modification in pyridine. The adsorption capability of the modified peel dreg on Cu2+, Cd2+ and Pb2+ was influenced by the initial metal concentration, adsorption time and solution pH value. The maximum adsorption capacities of modified peel dreg of Chinese water chestnut reached 44.80±2.68 mg/g for Cu2+ at pH 5.5, 80.73±6.25 mg/g for Pb2+ at pH 5.6 and 45.94±3.15 mg/g for Cd2+ at pH 7.8. As an chemical style, the kinetics of adsorption process was accorded with lagrange pseudo second-order model. The adsorption isothermal experimental data coincided well with Langmuir model. FT-IR analysis indicated that the carboxylation reaction took place during the modification of the Chinese water chestnut peel.
