Gelatinized starch was prepared by constantly stirring a mixture of starch and water at 95 C for 1 hour. Starch-graft-acrylic acid (S-g-AA) hydrogels were prepared by grafting acrylic acid (AA) [monomer=starch (w=w) 0.5-1.5] onto gelatinized starch with ceric ammonium nitrate as initiator under nitrogen atmosphere. The surface morphology of samples was studied using a scanning electron microscope (SEM). The hydrogels were evaluated for the removal of Cu 2þ ion from aqueous solutions at different pH. The concentration of Cu 2þ ion in aqueous solution was kept constant at 4 mmol=L. The metal ion removal capacities changed depending on treatment time, initial pH of the solution, and monomer=starch (w=w) ratio of the S-g-AA hydrogels. Cu 2þ ion removal capacities were determined by atomic absorption spectrometer (AAS).
Graft copolymerization of acrylic acid (AA) onto starch was carried out with ceric ammonium nitrate as initiator under nitrogen atmosphere. The grafting percentages (GP%) of starch-graft-acrylic acid (St-g-AA) copolymers were determined. The effect of GP% of St-g-AA copolymers on the competitive removal of Co 2þ , Ni . In this study, metal ion removal capacities were determined by atomic absorption spectrophotometer (AAS).
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