Synergistic extraction of rare-earth metals and separation of scandium using 2-thenoyltrifluoroacetone and tri-n-octylphosphine oxide in an ionic liquid system

Zhigang Zhao, Yuzo Baba, Fukiko Kubota, Noriho Kamiya, Masahiro Goto, Noriho Kamiya, Masahiro Goto

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)656-662
Number of pages7
JournalJOURNAL OF CHEMICAL ENGINEERING OF JAPAN
Volume47
Issue number8
DOIs
Publication statusPublished - 2014

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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