二烷基膦酸载体液膜中Zn(II)的传输研究

A Study on Transport of Zn(II) in the System of Inner-Coupled Liquid Membrane Containing Dialkylphosphonic Acid

研究了以烷基膦酸 PC-88A为流动载体的液膜中 Zn( II)的迁移规律 ,并考察了料液相 p H、温度、载体浓度及解析相组成对 Zn( II)迁移过程的影响。结果表明 ,增加载体浓度或升高温度 ,Zn( II)迁移速率明显增大 ,料液相 p H在 2 .4～ 5.1时可获得较大的 Zn( II)迁移速率。确定了最佳传质条件 ,探讨了各种因素影响机理 ,实现了 Zn( II)与 Cd( II)的分离。

The transport rate of Zn(II) in the system of inner coupled liquid membrane containing 2 ethylhexylphosphonic acid mono 2 ethylhexyl ester (PC 88A) as a mobile carrier in CHCl 3 solvent has been studied in this paper. The influence of the pH values in aqueous feed, PC 88A carrier concentration, temperature and strip components has also been investigated. The data have been explained by a steady state permeability equation in terms of membrane diffusion, aqueous film diffusion and aqueous complex formation chemistry. The best experimental conditions to perform a Zn(II) transport have been identified. The separation of Zn(II) and Cd(II) has been experimentally studied.