Adsorption Kinetics and Isotherms of Copper Ion in Aqueous Solution by Bentonite Supported Nanoscale Zero Valent Iron

摘要

Copper ions discharged into the water can cause serious damages to the plants and living organisms in water. Therefore, it is very important to develop effective technologies to treat copper ions polluted wastewaters before their discharge into the natural environment. The main objective of this study was to evaluate copper ions removal by bentonite supported nanoscale zero valent iron (nZVI). In this work, the bentonite supported nZVI was synthesized by direct mixing of bentonite pretreated with nZVI. A range of experiments were conducted to evaluate the sorption ability of bentonite supported nZVI to copper ions in aqueous solutions. Results showed that the contact time, pH in solution and initial concentration of copper ions had an important effect on the removal of copper ions from aqueous solution by bentonite supported nZVI. The Freundlich and pseudo-second-order kinetic models can preferably describe the adsorption process.