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Ionic Liquid Synergistic Cation-Exchange System for the Selective Extraction of Lanthanum(III) 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, l-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.

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Authors and Affiliations

  1. Division of Material Sciences, Graduate School of Natural Science and Technology, Kakuma-machi, Kanazawa, 920-1192, Japan

    Naoki Hirayama, Keiji Kidani & Hisanori Imura

  2. Division of Material Chemistry, Graduate School of Natural Science and Technology, Kakuma-machi, Kanazawa, 920-1192, Japan

    Hiroyuki Okamura

Authors
  1. Naoki Hirayama
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  2. Hiroyuki Okamura
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  3. Keiji Kidani
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  4. Hisanori Imura
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Correspondence to Naoki Hirayama.

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Hirayama, N., Okamura, H., Kidani, K. et al. Ionic Liquid Synergistic Cation-Exchange System for the Selective Extraction of Lanthanum(III) Using 2-Thenoyltrifluoroacetone and 18-Crown-6. ANAL. SCI. 24, 697–699 (2008). https://doi.org/10.2116/analsci.24.697

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  • DOI: https://doi.org/10.2116/analsci.24.697

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