Abstract：GA-g-PAMPS/AA/ST composite hydrogel was prepared by graft copolymerization of gum arabic (GA), 2-acrylamido-2-methylpropanesulfonicacid (AMPS), acryllic acid (AA), sepiolite clay (ST) by microwave irradiation. The composite hydrogel was characterized by numerous techniques including FTIR, XRD and SEM. The adsorption propertie of the hydrogel on methylene blue (MB) in aqueous solution was studied. The hydrogel with uniform three-dimensional network was synthesized. Under the conditions of dosage of 0.025g, the volume of 50mL, pH of 6.4 and the initial concentration of 600mg/L, the adsorption capacity and removal was found to be 1146mg/g and 95.5%, respectively. Hydrogel had good repetition use performance. Meanwhile, the adsorption process described by Freundlich isothermal model and quasi-second-order kinetic equation better. Furthermore, thermodynamic studies showed that hydrogel's adsorption of methylene blue was a spontaneous, endothermic and irreversible process. Therefore, it could be used as a potential candidate biomass adsorbent for cationic dyes and pollutants.
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