Cyanex272－Span80－甲苯乳状液膜迁移分离锌、镉及其它元素的研究

Study on Transport and Separation of Zn(Ⅱ) from Cd(Ⅱ)and Other Metal Ions Through the Emulsion Liquid Membrane of Cyanex 272-Span 80-Toluene

用Ｃｙａｎｅｘ ２７２－Ｓｐａｎ ８０－甲苯乳状液膜研究了Ｚｎ（２＋）的迁移行为，在适宜条件下，５ｍｉｎ内锌的迁移率达９５％以上。而在此条件下，与锌性质相近的镉、铜、钴、镍、汞等金属离子不迁移或迁移率很低。因此，用此乳状液膜体系可将锌与镉及其它常见离子分离。

The transport behaviour of Zn(Ⅱ)through the emulsion liquid membrane system of Cyanex 272-Span 80-toluene has been studied. The transport conditions of Zn(Ⅱ) with high efficiency and high speed are as follows:membrane phase:0.020 mol/L Cyanex 272+3%(W/V)Span 80+toluene;outer phase:pH 4-5 with SCN-,ClO,NO,Ac- and Cl- as mediums;inner phase:H2SO4,EDTA,or HCl in needed concentrations; the volume ratio of emulsion to outer aqueous phase: 1-2.5 mL:10 mL. The transport rate of Zn(Ⅱ)in 5 min is above 95%.In this case, Many co-ions, such as Cd(Ⅱ), Co(Ⅱ) , Ni(Ⅱ) ,Hg(Ⅱ), Cu(Ⅱ) etc.can only be transported a little through this emulsion liquid membrane. So Zn(Ⅱ) can be separated from these ions with satisfactory.