A. Stojanovic

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Publications (3)6.36 Total impact

  • Article: Phosphonium and ammonium ionic liquids with aromatic anions: Synthesis, properties, and platinum extraction
    A. Stojanovic, D. Kogelnig, L. Fischer, S. Hann, M. Galanski, M. Groessl, R. Krachler, B.K. Keppler
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    ABSTRACT: Cited By (since 1996): 1, Export Date: 15 May 2011, Source: Scopus
    Australian Journal of Chemistry 01/2010; 63:511-524. · 2.34 Impact Factor
  • Article: Transport and separation of iron(III) from nickel(II) with the ionic liquid trihexyl(tetradecyl)phosphonium chloride
    D. Kogelnig, A. Stojanovic, F. Jirsa, W. Korner, R. Krachler, B. K. Keppler
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    ABSTRACT: Iron(III) was efficiently extracted from a 6 M hydrochloride solution with the ionic liquid trihexyl(tetradecyl)phosphonium chloride, Cyphos (R), dissolved in chloroform. Spectroscopical data revealed that iron exists as tetrachloroferrate species in the organic phase. In contrast, nickel(II) was not extracted under experimental conditions. Satisfying back extraction of Fe(III) was achieved with a 0.5 M HCl solution. Consequent time-dependent transport studies with Cyphos IL101 as ionic liquid carrier in chloroform (0.01 M), showed a successful quantitative transport of 0.1 M Fe(III) from a 6 M hydrochloride source phase to a 0.5 M hydrochloride receiving phase and a favorable separation from Ni(II). The transport of Fe(III) through the bulk liquid membrane (BLM) was assumed to follow a nonsteady kinetic regime with two consecutive and irreversible first-order reactions. With an initial Fe(III)/Cyphos IL101 concentration ratio of 10, an apparent rate constant k(s) of 31.4 x 10(-3) min(-1) was obtained for the Fe(III) transport from the membrane- to the receiving phase, whereas the rate constant k(f) for the Fe(III) transport from the source- to the membrane phase was 11.8 x 10(-3) min(-1). (C) 2010 Elsevier B.V. All rights reserved.
    Separation and Purification Technology 01/2010; 72(1):56-60. · 2.92 Impact Factor
  • Article: Uranium extraction from aqueous solutions by ionic liquids.
    M Srncik, D Kogelnig, A Stojanovic, W Körner, R Krachler, G Wallner
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    ABSTRACT: For determining natural levels of (236)U with its environmental abundance of 10(-16)% rather large sample volumes (approximately 30L) are necessary, therefore the conventional radiochemical uranium analysis (pre-concentration and column chromatography) is very time consuming. To speed up the procedure hydrophobic ionic liquids (ILs) were evaluated as a potential extraction agent for uranium from aqueous solutions. High selectivity and efficiency for uranium compared to calcium and magnesium in natural water was achieved with tricaprylmethylammonium thiosalicylate, [A336][TS]. Uranium was stripped successfully from the investigated ILs with 2M HNO(3).
    Applied radiation and isotopes: including data, instrumentation and methods for use in agriculture, industry and medicine 06/2009; 67(12):2146-9. · 1.09 Impact Factor
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