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Adsorption capacity, kinetics, and mechanism of copper(II) uptake on gelatin-based hydrogels



Gelatin-based hydrogels were synthesized and characterized for use as Cu2+-ion sorbents. Gelatin was crosslinked in the presence of two different monomers, that is, acrylamide (AAm) and/or 2-hydroxypropyl methacrylate, with N,N-methylenebisacrylamide, ammonium persulfate, and sodium bicarbonate. The as-prepared hydrogels were further characterized by scanning electron microscopy, Fourier transform spectroscopy, and the study of their swelling behavior as a function of temperature, time, and pH to evaluate their structure–property relationships. The hydrogels were observed to be good sorbents of Cu2+, and a maximum uptake of 84.8% was observed within 2 h at 37°C and with 10 ppm of the Cu2+-ion solution for the gelatin and polyacrylamide hydrogel, which also exhibited the maximum retention capacity at 14.9 mg/g after four feeds. All of the experimental data exhibited good matches with the Langmuir isotherm and followed pseudo-second-order kinetics. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011