Equilibrium and thermodynamics of dye removal from aqueous solution by adsorption using rubber wood saw dust

Abstract

Batch equilibrium experiments were carried out for the sorption of Bismarck brown onto rubber wood saw dust particles. The operating variables studied were the initial dye concentration, particle diameter and solution temperature. A linearised Langmuir isotherm was found to well represent the equilibrium uptake for the range of operating conditions studied. The monolayer sorption capacity of rubber wood saw dust for the sorption of Bismarck brown was estimated to be 35 mg g−1. The sorption capacity was found to increase with decreasing particle size. The negative value of ΔG and ΔH suggests the spontaneity and exothermic nature of the process.