Adsorption of Toxic Ni (II) from an Aqueous Solution by Bentonite

摘要

In this study, the adsorption potential of bentonite for removal of Ni(II) ions from wastewater has been investigated. The study involves batch type experiments to investigate the effect of initial concentration, adsorbent dose, agitation speed, contact time, temperature and pH of the solution on adsorption process and the optimum conditions were evaluated. The adsorption process fits pseudo-second order kinetic models. Langmuir and Freundich adsorption isotherm models were applied to analyze adsorption data and both were found to be applicable to the adsorption process. Thermodynamic parameters, e.g., ΔG~o, ΔS~o and ΔH~o of the on-going adsorption process have also been calculated and the sorption process was found to be endothermic. Finally, it can be seen that Bentonite was found to be more effective for the removal of Ni(II) at the same experimental conditions.