Extraction and separation of Pt and Pd by an imidazolium-based ionic liquid combined with phosphonium chloride

Fukiko Kubota, Eiko Shigyo, Wataru Yoshida, Masahiro Goto

    Research output: Contribution to journalArticlepeer-review

    16 Citations (Scopus)

    Abstract

    Extraction and separation of Pt(IV) and Pd(II) from a hydrochloric acid solution was examined with a mixture of undiluted ionic liquids, 1-methyl-3-octylimidazolium bis(trifluoromethylsulfonyl)imide ([C8mim][Tf2N]) and trihexyltetradecylphosphonium chloride ([P6,6,6,14][Cl]). Imidazolium-based [C8mim][Tf2N] shows a high selectivity for Pt(VI), whereas [P6,6,6,14][Cl] has a high extraction ability for both Pt(IV) and Pd(II). The addition of [P6,6,6,14][Cl] to [C8mim][Tf2N] improved the extraction efficiency for Pt and the separation factor between Pt and Pd also increased. This improvement was attributed to the presence of Cl- being more hydrophilic than Tf2N- in the [C8mim][Tf2N] extraction phase. Stripping of the metals was possible with HNO3 solution without any degradation of the ionic liquid extraction phase. The ionic liquid mixture was shown to be reusable for at least five extraction cycles.

    Original languageEnglish
    Pages (from-to)97-104
    Number of pages8
    JournalSolvent Extraction Research and Development
    Volume24
    Issue number2
    DOIs
    Publication statusPublished - 2017

    All Science Journal Classification (ASJC) codes

    • Chemistry(all)
    • Chemical Engineering(all)

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