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The application of poly(acrylamide‐co‐sodium methacrylate) hydrogel for the removal of Cu2+ and Cd2+ ions from aqueous solutions has been investigated as a function of pH, adsorbent dose and temperature. FTIR spectra showed that –NH2 and –COOH groups are involved in both metal ions adsorption which followed pseudo‐first order kinetics. Non‐linear 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, RL, the Cu2+ and Cd2+ ions adsorption is favorable. The maximum adsorption of 24.05 mg/g (48%) for Cu2+ ions and 32.99 mg/g (66%) for Cd2+ ions has been obtained at pH 5.0 and sorbent dosage of 300 mg.
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Milosavljević et al. (2013) studied this question.
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