Contribution to Modelling the Effect of Temperature on Removal of Nickel Ions by Adsorption on Nano-Bentonite

Abstract

Nano-bentonite was investigated as a prospect sorbent for the elimination of nickel ions from aqueous solutions. At optimum conditions; pH 6, Ni(II) primary concentration 100 mg/L and adsorbent dosage 0.5 g, the achieved highest adsorption capability was 39.06 mg/g. The isothermal data were modeled with Langmuir and Freundlich isotherm models. Thermodynamic data revealed the spontaneity of target species adsorption onto used adsorbent, raise in entropy change at the solid-liquid boundary and endothermic process. The purpose of this study was to extend primary and secondary prototypes to express the effect of temperature (from 20 to 50 C) on the sorption of nickel ions onto bentonite surface. Proposed models could be integrated to suggest some practical equations for different experimental conditions and can be exploited for further prediction and interesting additional interpretations.