Removal of Pb²⁺ Ions from Water by Poly(Acrylamide-co-Sodium Methacrylate) Hydrogels
2012
Kalagasidis Krušić, M. | Milosavljević, N. | Debeljković, A. | Üzüm, Ö. B. | Karadağ, E.
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.
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