Adsorption and removal of cadmium (Ⅱ) from aqueous solutions by bio-formulation

来源期刊：中国有色金属学报(英文版)2007年第5期

论文作者：柴立元 陈云嫩 舒余德 常皓 李青竹

文章页码：1057 - 1057

Key words：cadmium; bio-formulation(BF); adsorption; desorption

Abstract: A novel sorbent, bio-formulation(BF), was prepared and employed for the adsorption of cadmium(Cd) ion from aqueous system. The process of adsorption follows the pseudo second-order kinetic equation and the adsorption behavior is fitted with a Freundlich isotherm. The removal rate of Cd is slightly dependent on the initial pH value over a wide range of 4-11. The addition of Zn²⁺ and Cu²⁺ ions hardly affects the Cd adsorption, whereas the coexisting Pb²⁺ ion greatly interferes with the adsorption. The adsorption mechanism is supposed as a cation-exchange process between Cd²⁺ and calcium and Mg²⁺ present on the surface of BF, and somewhat as adsorption in a hydrolyzed form. The adsorbed Cd ions are desorbed effectively by a 0.1 mol/L HCl solution.

基金信息：the National Natural Science Foundation of China
Key Program of Science and Technology Plan of Hunan Province, China