Ionic Liquid Synergistic Cation-Exchange System for the Selective Extraction of Lanthanum(III) Using 2-Thenoyltrifluoroacetone and 18-Crown-6

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  • HIRAYAMA Naoki
    Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University
  • OKAMURA Hiroyuki
    Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University
  • KIDANI Keiji
    Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University
  • IMURA Hisanori
    Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University

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  • Ionic liquid synergistic cation-exchange system for the selective extraction of lanthanum(3) using 2-thenoyltrifluoroacetone and 18-crown-6

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Abstract

A novel synergistic extraction system was investigated for the possible selective separation of light lanthanoids using an ionic liquid, 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, as an extraction solvent and 2-thenoyltrifluoroacetone and 18-crown-6 as extractants. Trivalent lanthanum was efficiently extracted as a cationic ternary complex by the cation-exchange process, whereas europium and lutetium showed relatively low extractability without forming respective ternary complexes. This result is thought to originate in a size-fitting effect of 18-crown-6 to lanthanum and the unique nature of the ionic liquid as a chelate extraction solvent.

Journal

  • Analytical Sciences

    Analytical Sciences 24 (6), 697-699, 2008

    The Japan Society for Analytical Chemistry

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