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

Chem. J. Chinese Universities ›› 1994, Vol. 15 ›› Issue (2): 185.

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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

ZOU Chang-Ying, LI Ke-An, TONG Shen-Yang

Department of Chemistry, Peking University, Beijing, 100871

Received:1993-02-26 Revised:1993-06-05 Online:1994-02-24 Published:1994-02-24

Abstract

Abstract: The transport behaviour of Zn(Ⅱ)through the emulsion liquid membrane system of Cyanex 272-Span 80-to luene 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^-,ClO₄^-,NO₃^-,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 5min 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.

Key words: Emulsion liquid membrane, Cyanex 272, Transport, Zn(Ⅱ), Cd(Ⅱ)

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ZOU Chang-Ying, LI Ke-An, TONG Shen-Yang . 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[J]. Chem. J. Chinese Universities, 1994, 15(2): 185.

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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

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