Abstract
ABSTRACTThe aim of this research work is to investigate adsorption of mercury ions from an aqueous solution on a biocompatible polymeric polypyrrole‐chitosan (PPy/CTN) nanocomposite. The PPy/CTN nanocomposite was prepared in aqueous media by chemical polymerization of pyrrole in the presence of ferric chloride as an oxidant. Langmuir, Freundlich, and Temkin adsorption isotherms were applicable to the adsorption process, and their constants were evaluated. The thermodynamic equilibrium constant and the Gibbs free energy were determined. Results indicated that the Langmuir model gave a better fit to the experimental data than the other two equations. The adsorption capacity (qmax) of PPy/CTN for Hg(II) ions in terms of monolayer adsorption was 40 mg/g. The negative value of Gibbs free energy (ΔGo) indicates feasible and spontaneous adsorption of Hg(II) on the PPy/CTN nanocomposite. Also the change in entropy (ΔSo) and enthalpy (ΔHo) were estimated to be –0.21 KJ (mol K)−1 and –18.183 kJ mol−1, respectively.
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