Selective transport of Pb(II) across polymer inclusion membrane using imidazole azocrownethers as carriers.
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Czestochowa University of Technology
Gdańsk University of Technology
Małgorzata Ulewicz   

Department of Metal Extraction and Recirculation, Czestochowa University of Technology, 42-200 Częstochowa, Armii Krajowej 19 Street
Publication date: 2007-01-01
Physicochem. Probl. Miner. Process. 2007;41(1):133–143
Transport of Pb(II) ions from equimolar aqueous solutions of Zn(II), Cd(II), and Pb(II) as well as from solutions containing only Pb(II) ions source phase (cMe = 0.001 M) through polymer inclusion membranes (PIMs) containing imidazole azocrown ethers as carriers has been investigated. The polymer membranes consisting of cellulose triacetate (support), o-nitrophenyl pentyl ether (plasticizer) and imidazole crown ether derivatives (as ion carriers) were investigated. The influence of lipophilicity of macrocycles on the selectivity and efficiency of Pb(II) transport with azocrown 3 are higher than 1, accordingly with the hydrophile-lipophile balance of imidazole azocrown ethers. The highest transport recovery for Pb(II) ions was observed for 3 (91.6%). The transport selectivity of the polymer inclusion membrane with 3 was: Pb(II) > Zn(II) > Cd(II) and the selectivity coefficient Pb(II)/Cd(II) and Pb(II)/Zn(II) equals 40.1 and 13.4, respectively. The stability of PIM with imidazole azocrown derivatives was confirmed by replicate experiments.