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

作　　者：柴立元 陈云嫩 舒余德 常皓 李青竹 

机构地区：[1]Department of Metallurgical Science and Engineering,Central South University

出　　处：《中国有色金属学会会刊：英文版》2007年第5期1057-1062,共6页Transactions of Nonferrous Metals Society of China

基　　金：Projects(20477059, 50508044) supported by the National Natural Science Foundation of China;Project(05SK1003-1) supported by Key Program of Science and Technology Plan of Hunan Province, China

摘　　要：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.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 Zn^2＋ and Cu^2＋ ions hardly affects the Cd adsorption, whereas the coexisting Pb^2＋ ion greatly interferes with the adsorption. The adsorption mechanism is supposed as a cation-exchange process between Cd^2＋ and calcium and Mg^2＋ 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.

关 键 词：吸附 解吸 镉 生物公式 

分 类 号：TG111[金属学及工艺—物理冶金]