ADSORPTION OF Pb2+ IONS FROM AQUEOUS SOLUTION ONTO CHITOSAN LOADED MnO2 NANOPARTICLES: EQUILIBRIUM ISOTHERM STUDIES

Abstract

    Equilibrium sorption of the Chitosan loaded manganese dioxide (MnO2) nanoparticles wasstudied. The experimental data were analyzed by five adsorption isotherm models:Freundlich, Langmuir, Redlich-Peterson, Tempkin and Dubinin - Redushkevich (D - R).Evaluating the correlation coefficients showed that the Redlich-Peterson isotherm describedthe data move appropriable than others. The adsorption capacity (qm) from the Langmuirisotherm for Pb2+ is found as 129.8 mg/g. The heat of sorption process for Pb2+was estimatedfrom Temkin Isotherm model to be 0.1546 KJ/mol and the mean free energy for Pb2+ was estimated from D - R isotherm model to be 0.5189 KJ/mol which vividly proved that theadsorption experiment followed a physical process.

Keywords: Freundlich, Langmuir, Redlich-Peterson, Tempkin, Dubinin-Redushkevich (D-R).