Solvent Extraction of Nickel(II) Using Ionic Liquid Containing 2-Pyridinealdoxime

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  • Kozaka Kengo
    Department of Environmental Chemistry, College of Environmental Engineering and Architecture, Kanazawa Institute of Technology
  • Noro Junji
    NISSAN ARC, LTD.
  • Watanabe Yujiro
    Department of Environmental Chemistry, College of Environmental Engineering and Architecture, Kanazawa Institute of Technology
  • Komatsu Yu
    Department of Environmental Chemistry, College of Environmental Engineering and Architecture, Kanazawa Institute of Technology

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Other Title
  • ２‐ピリジンアルドキシム含有イオン液体を用いるニッケル（ＩＩ）の抽出
  • 2-ピリジンアルドキシム含有イオン液体を用いるニッケル(2)の抽出
  • 2 ピリジンアルドキシム ガンユウ イオン エキタイ オ モチイル ニッケル 2 ノ チュウシュツ

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Abstract

The authors reported in a previous paper on the extraction and separation of divalent metals, such as Cd<sup>2+</sup>, Pb2+, Ni2+, and Zn2+, by using an ionic liquid, 1-butyl-3-methylimidazolium hexafluorophosphate ([Bmim][PF6]), including the extractant of 2-pyridinealdoxime (2-PA). However, the extraction equilibrium of Ni2+in the 2-PA/[Bmim][PF6] extraction system remained unresolved. Then, the present study was undertaken to elucidate the extraction mechanism of Ni2+ in the 2-PA/[Bmim][PF6] extraction system, as well as the effect of masking reagent on the metal extraction. The chemical form of the extracted Ni-complex was examined by analyzing the slope for the relationship between log D and the pH and between log D and log [2-PA] in [Bmim][PF6]. Taking into account the facts that the slopes for the above-mentioned relationships were both close to 2.0 and the Ni2+ ion was mainly extracted in the acidic pH region in the vicinity of a pKa1 of 2-PA (3.73) the extraction equilibrium of Ni2+ with 2-PA into [Bmim][PF6] phase was concluded to be Ni2+(aq)+2H2L+(aq)+2Bmim+•PF6−(org)↔Ni(HL)22+•2PF6−(org)+2H++2Bmim+(aq), where HL and Bmim•PF6 denote 2-PA and 1-butyl-3-methylimidazolium hexafluorophosphate and the subscript (org) and (aq) means the organic phase and aqueous phase, respectively. That is, the pyridinium form of 2-PA, H2L+, in the aqueous phase reacted with the Ni2+(aq) ion to form a nickel-2-PA complex cation, Ni(HL)2+(aq), while repelling two H+ ions. Then, the formed Ni(HL)2+(aq) ion was distributed into the organic phase by ion exchanging with the 1-butyl-3-methylimidazolium cation in the organic phase.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 57 (8), 593-597, 2008

    The Japan Society for Analytical Chemistry

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