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

doi:10.15261/serdj.24.97

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

Molecular Information Chemistry

Research output: Contribution to journal › Article › peer-review

14 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 ([P_6,6,6,14][Cl]). Imidazolium-based [C8mim][Tf₂N] shows a high selectivity for Pt(VI), whereas [P_6,6,6,14][Cl] has a high extraction ability for both Pt(IV) and Pd(II). The addition of [P_6,6,6,14][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 language	English
Pages (from-to)	97-104
Number of pages	8
Journal	Solvent Extraction Research and Development
Volume	24
Issue number	2
DOIs	https://doi.org/10.15261/serdj.24.97
Publication status	Published - Jan 1 2017

All Science Journal Classification (ASJC) codes

Chemistry(all)
Chemical Engineering(all)

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

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.",

author = "Fukiko Kubota and Eiko Shigyo and Wataru Yoshida and Masahiro Goto",

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T1 - Extraction and separation of Pt and Pd by an imidazolium-based ionic liquid combined with phosphonium chloride

AU - Kubota, Fukiko

AU - Shigyo, Eiko

AU - Yoshida, Wataru

AU - Goto, Masahiro

PY - 2017/1/1

Y1 - 2017/1/1

N2 - 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.

AB - 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.

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