Removal of Zn(II), Cd(II) and Pb(II) using polymer inclusion membrane transport with proton ionizable DB-16-C-5 crown ethers
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Czestochowa University of Technology
Wroclaw University of Technology
Małgorzata Ulewicz   

Department of Metal Extraction and Recirculation, Czestochowa University of Technology, 42-200 Częstochowa, Armii Krajowej 19 Street
Publication date: 2006-01-01
Physicochem. Probl. Miner. Process. 2006;40(1):185–194
Competitive transport of Zn(II), Cd(II), and Pb(II) ions from aqueous nitrate source phase (cMe = 0.001 M) through polymer inclusion membranes (PIMs) containing cellulose triacetate (as support), o-nitrophenyl pentyl ether (as plasticizer) and proton ionizable lariat ether derivatives (as ion carriers) has been investigated. The influence of varying the lipophilicity of sym(R)(hydroxy)dibenzo-16-crown-5 macrocycles with R groups such as hydrogen (in 1), decyl (in 2) and phenyl (in 3) on the selectivity and efficiency of Zn(II), Cd(II), and Pb(II) transport through polymer inclusion membranes is studied. The influence of HLB (hydrophile-lipophile balance) and Vx (molecular volumes) on the transport selectivity of metal ions was investigated. Relationship between the cation size and initial fluxes transport of metal cation was shown. The selectivity coefficients of Pb(II)/Zn(II) and Cd(II)/Zn(II) decrease with increase of carrier concentration in inclusion membrane.