Extraction behavior of indium with TOPO into ionic liquids

Fukiko Kubota, Yosuke Shimobori, Yusuke Koyanagi, Kazunori Nakashima, Kojiro Shimojo, Noriho Kamiya, Masahiro Goto

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


The extraction behavior of In3+ into ionic liquids, [C nmim][Tf2N], was investigated with trioctylphosphine oxide (TOPO) as the extractant and compared with that of a conventional organic solvent system. In the n-dodecane system, the extractability of In3+ increased with increasing hydrochloric acid concentration in the feed aqueous phase. On the contrary when using ionic liquids, In3+ was more extracted at lower concentrations of hydrochloric acid. The contrast between the two systems is probably due to the difference in their extraction mechanisms. Extraction and separation properties of In3+ from Sn4+, Fe3+and Al3+ were also examined. Indium was quantitatively extracted into the ionic liquid phase and the separation efficiency from other metal ions, especially from Fe3+ was enhanced compared with that in the organic solvent system.

Original languageEnglish
Pages (from-to)151-155
Number of pages5
JournalSolvent Extraction Research and Development, Japan
Publication statusPublished - 2009

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Chemical Engineering


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