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    Wyświetlanie 1-3 z 3
    Tytuł:
    Zinc(II) selective removal from other transition metal ions by solvent extraction and transport through polymer inclusion membranes with D2EHPA
    Autorzy:
    Ulewicz, M.
    Walkowiak, W.
    Pośpiech, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/346997.pdf
    Data publikacji:
    2003
    Wydawca:
    Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
    Tematy:
    polymer inclusion membrane
    solvent extraction
    zinc(II)
    cobalt(II)
    nickel(II)
    copper(II)
    cadmium(II)
    Opis:
    An experimental investigation concerns zinc(II), cobalt(II), nickel(II), copper(II) and cadmium(II) ions separation from aqueous chloride solutions by solvent extraction and transport through polymer inclusion membrane (PIM) processes. The selective transport of metal ions from the aqueous chloride source phase through PIM containing cellulose triacetate (support), o-nitrophenyl pentyl ether (plasticizer) and di(2-ethylhexyl)phosphoric acid (ion carrier) is shown. Zn(II) can be effectively removed from dilute aqueous chloride solutions by its transport through PIMs with di(2-ethylhexyl)phosphoric acid as the ionic carriers into 1.0 M HCl as the receiving phase. The transport selectivity of Zn(II) over Co(II), Ni(II), Cu(II) and Cd(II) decreases while the pH of the solution increases in the source phase. Also, by solvent extraction, Zn(II) can be selectively removed from dilute aqueous chloride solutions.
    Źródło:
    Ars Separatoria Acta; 2003, 2; 47-55
    1731-6340
    Pojawia się w:
    Ars Separatoria Acta
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transport of transition metal ions through polymer inclusion membranes with Cyanex 301
    Autorzy:
    Ulewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/347064.pdf
    Data publikacji:
    2004
    Wydawca:
    Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
    Tematy:
    polymer inclusion membrane
    zinc(II)
    cadmium(II)
    copper(II)
    cobalt(II)
    nickel(II)
    Cyanex 301
    Opis:
    The selective transport of zinc(II) and cadmium(II) ions from aqueous chloride or sulfate source phase through polymer inclusion membranes (PIM) containing cellulose triacetate (support), o-nitrophenyl pentyl ether (plasticizer) and di(2,4,4-trimethylpentyl)dithiophosphinic acid - Cyanex 301 (ion carrier) is shown. Zn(II) and Cd(II) ions can be effectively removed from dilute chloride and sulfate aqueous solutions into 1.0 M HCl or H2SO4 as the receiving phase. The separation coefficients were practically constant for acid concentrations in the receiving phase ranging from 0.01 to 1.0 M Copper(II), zinc(II), cadmium(II), cobalt(II), and nickel(II) ions removal from aqueous chloride solutions in transport through PIMs is also shown. These metal ions can be effectively removed from dilute aqueous chloride solutions in transport through PIMs with di(2,4,4-trimethylpentyl)dithiophosphinic acid as the ionic carriers into 1.0 M HCl. The selectivity coefficients of Cu(II) over Zn(II), Cd(II), Co(II) and Ni(II) were low and decreased with an increase in the pH of source aqueous phase.
    Źródło:
    Ars Separatoria Acta; 2004, 3; 81-88
    1731-6340
    Pojawia się w:
    Ars Separatoria Acta
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selective removal of Cu(II), Co(II), Zn(II), and Ni(II) with ionizable dibenzo-16-crown-5 and dibenzo-19-crown-6 lariat ethers as ion carriers in polymer inclusion membrane transport
    Autorzy:
    Kozłowski, C. A.
    Walkowiak, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/346931.pdf
    Data publikacji:
    2007
    Wydawca:
    Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydział Technologii i Inżynierii Chemicznej
    Tematy:
    polymer inclusion membrane
    competitive transport
    copper(II)
    cobalt(II)
    zinc(II)
    nickel(II)
    enthalpy of formation
    Derivatives of dibenzo-16-crown-5 and dibenzo-19-crown-6
    Opis:
    A selective removal of transition metal cations, i.e. Cu(II), Co(II), Zn(II), and Ni(II), with ionizable dibenzo-16-crown-5 and dibenzo-19-crown-6 lariat ethers as ionic carriers in transport across polymer inclusion membrane has been presented. The competitive transport from aqueous nitrate solutions containing metal ions at concentrations of 0.0010 M at pH 4.0 and 7.0 through the cellulose triacetate membrane with 0.5 M lariat ether 1 and 2 (based on a plasticizer) as the ion carrier and o-nitrophenyl pentyl ether (ONPPE) as the plasticizer into 0.5 M hydrochloric solution was performed. For pH = 4.0 and 7.0 of source aqueous phases the selectivity orders were as follows: Cu(II) > Co(II) > Zn(II) > Ni(II), and Cu(II) > Zn(II), Ni(II), Co(II), respectively. The semi-empirical equation was used for calculations of enthalpy formation for complexes of lariat ethers studied with transition metal cations. The two possibilities of metal cation-lariat ether coordination were assumed, i.e. via the crown ether cavity or ionizable carboxylic group. We found that for the both lariat ethers studied at pH 4.0 of source phase the transport rate linearly decreases with the enthalpy of formation increase. This correlation confirms that the observed behavior is connected with the stability of complexes formed by interaction of the lariat ether ring and the transition metal cations studied.
    Źródło:
    Ars Separatoria Acta; 2007, 5; 19-26
    1731-6340
    Pojawia się w:
    Ars Separatoria Acta
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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