Removal of Pb2+ Ions from Water by Poly(Acrylamide-co-Sodium Methacrylate) Hydrogels
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The application of poly(acrylamide-co-sodium methacrylate) (AAm/SMA) hydrogel for the removal of Pb2+ ions from aqueous solutions has been investigated using batch adsorption technique. The extent of adsorption was investigated as a function of pH, adsorbent dose, and temperature. The Fourier transform infrared (FTIR) spectra showed that –NH2 and –COOH groups are involved in Pb2+ ion adsorption. The obtained results were analyzed by pseudo-first-order, pseudo-second–order, and intraparticle diffusion models using both linear and nonlinear methods. It was found that the Pb2+ ion adsorption followed pseudo-first-order kinetics. Nonlinear regression analysis of six isotherms, Langmuir, Freundlich, Redlich-Peterson, Toth, Dubinin-Radushkevich, and Sips, have been applied to the sorption data, while the best interpretation was given by Redlich-Peterson. Based on the separation factor, R L, the Pb2+ ion adsorption is favorable, while the negative values of ∆G indicates that the Pb2+ ion adsorption on the investigated hydrogel is spontaneous.
KeywordsHydrogel Pb2+ adsorption Adsorption isotherm Kinetic model
The authors acknowledge funding from the Ministry of Education and Science of the Republic of Serbia, Project No. 172062 and Adnan Menderes University Research Fund, under project number FEF 08 034. The authors would also like to thank Dr. Mirjana MIhajlović from the Institute for Biological Research 'Siniša Stanković', University of Belgrade, for her help in the sample lyophilization.
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