Adsorptive removal of chromium (VI) from aqueous solutions and its kinetics study

摘要

Removal of heavy metals from wastewater is absolutely essential to avoid water pollution. In the present study, performance of chitosan coated carbon was evaluated for the removal of chromium (VI) from aqueous solution. Batch adsorption experiments were performed in order to examine the removal process under various factors like the effects of initial concentration, adsorbent dose, pH, and contact time. The metal ion removal was pH dependent and reached optimum at pH 5.0. Experimental data were analysed by Langmuir and Freundlich adsorption isotherms. The characteristic parameters and related correlation coefficients have been determined. The isotherm study revealed that the adsorption equilibrium is well-fitted to the Freundlich isotherm. Pseudo-first- and -second-order kinetic models were used for describing kinetic data. It was determined that removal of Cr (VI) was well-fitted by second-order reaction kinetic. The results showed that chitosan coated carbon are favorable adsorbent of Cr (VI) from aqueous solution.