Synergistic Extraction of Rare-Earth Metals and Separation of Scandium Using 2-Thenoyltrifluoroacetone and Tri-n-octylphosphine Oxide in an Ionic Liquid System

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  • Zhao Zhigang
    Department of Applied Chemistry, Graduate School of Engineering, Kyushu University
  • Baba Yuzo
    Department of Applied Chemistry, Graduate School of Engineering, Kyushu University
  • Kubota Fukiko
    Department of Applied Chemistry, Graduate School of Engineering, Kyushu University
  • Kamiya Noriho
    Department of Applied Chemistry, Graduate School of Engineering, Kyushu University Center for Future Chemistry, Kyushu University
  • Goto Masahiro
    Department of Applied Chemistry, Graduate School of Engineering, Kyushu University Center for Future Chemistry, Kyushu University

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タイトル別名
  • Synergistic Extraction of Rare-Earth Metals and Separation of Scandium Using 2-Thenoyltrifluoroacetone and Tri-<i>n</i>-octylphosphine Oxide in an Ionic Liquid System
  • Synergistic extraction of rare-earth metals and separation of scandium using 2-thenoyltriuoroacetone and tri-n-octylphosphine oxide in an ionic liquid system

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The synergistic extraction of rare-earth metals by a β-diketone and an organophosphine oxide is described. A combination of 2-thenoyltrifluoroacetone (HTTA) and tri-n-octyl phosphine oxide (TOPO) was found to be effective in synergistically extracting rare-earth metals into an ionic liquid (IL). The synergistic effect was strongly influenced by the diluent in which the extractants were dissolved. Extraction efficiencies for all the rare-earth metal ions were enhanced by synergy when a conventional organic solvent was used (n-dodecane). However, the synergistic effect in the IL preferentially improved the scandium extraction, leading to higher selectivity for Sc than for other rare-earth metals. Slope analysis was used to assess each extraction system, and the IL itself was found to be directly involved in the complex formation of the metal extraction system.

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