Study on adsorption of Pb(II) and Cr(VI) by MMT/St-g-P(DMC-AA)

By applying methacryloyloxyethyl trimethyl ammonium chloride (DMC) and acrylic acid (AA) as the monomers, starch (St) as the main chain polymer, the composite MMT/St-g-P(DMC-AA) was prepared. Applied the composite as the adsorbent, Pb(NO3)2 (Pb(II)) and K2CrO7 (Cr(VI) ) as the adsorbates, the effects of adsorption time and the initial haevy metal ions concentrations on the adsorption capacities were studied. The adsorption data were evaluated by adsorption kinetics models. The experimental results showed that the adsorption capacities for heavy metal ions increased with the increasing of adsorption time, and then saturated after 60 min. And adsorption capacities for Pb(II) and Cr(VI) were 140.79 mg/g and 32.25 mg/g, respectively. The adsorption capacities also increased with the increase of initial concentrations. The adsorption data of Pb(II) and Cr(VI) by MMT/St-g-P(DMC-AA) were well described by the pseudo-second-order kinetic model.