Competitive transport of toxic metal ions by polymer inclusion membranes |
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| Authors: | C A Kozlowski W Walkowiak W Pellowski J Koziol |
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| Institution: | (1) Department of Chemistry, Technical University of Czestochowa, 42-200 Czestochowa, Armii Krajowej Street 19, Poland;(2) Institute of Inorganic Chemistry and Metallurgy of Rare Elements, Wroclaw University of Technology, 50-370 Wroclaw, Wybrzeze Wyspianskiego Street 27, Poland;(3) Institute of Chemistry and Environment Protection, Pedagogical University of Czestochowa, 42-201 Czestochowa, Armii Krajowej Street 13, Poland |
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| Abstract: | The paper gives a short overview of application of polymer inclusion membranes (PIMs) for separation and removal of metal ions. Investigation of the selective removal of toxic metal ions, i.e. Cr(VI), Cd(II), Zn(II) from acidic chloride aqueous solutions, as well as trace radionuclides, i.e., 137Cs, 90Sr and 60Co from wastewaters using transport across polymer inclusion membranes was studied. The carriers, i.e., tri-n-octylamine for anionic metal species, as well as dibenzo-21-crown-7, tertbutyl-dibenzo-21-crown-7, and dinonylnaphtalenesulfonic acid for metal cations were incorporated into polymer inclusion membranes composed of cellulose triacetate as a support and o-nitrophenyl pentyl ether as a plasticizer. Selective transport of chromium(VI) over zinc(II) and cadmium(II) chloride complexes through PIMs was observed. Competitive transport of trace radionuclide ions, i.e., 137Cs, 90Sr, and 60Co from NaNO3 aqueous solutions across polymer inclusion membranes containing a mixture of dinonylnaphtalenesulfonic acid, and dibenzo-21-crown-7 as the carrier provide the selectivity order Cs(I)>Sr(II)>Co(II). |
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