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

作者：Chai Li Yuan; Chen Yun Nen^*; Shu Yu De; Chang Hao; Li Qing Zhu

来源：Transactions of Nonferrous Metals Society of China, 2007, 17(5): 1057-1062.

DOI：10.1016/S1003-6326(07)60225-8

• cadmium
• bio-formulation(BF)
• adsorption
• desorption

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.

• 出版日期2007-10
• 单位中南大学