Removal of Cu2+ Ions from Aqueous Solutions by Starch-Graft-Acrylic Acid Hydrogels |
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Authors: | Gamze Güçlü Sibel Keleş Kubilay Güçlü |
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Affiliation: | 1. Department of Chemical Engineering, Faculty of Engineering , Istanbul University , Istanbul, Turkey gguclu@istanbul.edu.tr;3. Department of Chemical Engineering, Faculty of Engineering , Istanbul University , Istanbul, Turkey;4. Department of Chemistry, Faculty of Engineering , Istanbul University , Istanbul, Turkey |
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Abstract: | 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 Cu2+ ion from aqueous solutions at different pH. The concentration of Cu2+ 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. Cu2+ ion removal capacities were determined by atomic absorption spectrometer (AAS). |
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Keywords: | Starch Acrylic acid Graft copolymerization Heavy metal removal Hydrogel |
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