Selective extraction of Pt(IV) over Fe(III) from HCl with an amide-containing tertiary amine compound

Motoki Maeda, Hirokazu Narita, Chiharu Tokoro, Mikiya Tanaka, Ryuhei Motokawa, Hideaki Shiwaku, Tsuyoshi Yaita

    研究成果: Article査読

    12 被引用数 (Scopus)

    抄録

    The separation properties of Pt(IV) over Fe(III) in HCl solutions using N-2-ethylhexyl-bis(N-di-2-ethylhexyl-ethylamide)amine (EHBAA) were investigated and then compared with those using the conventional extractant tri-n-octylamine (TOA). Also, the structural analyses of Pt(IV) in both of the aqueous (HCl solution) and organic (EHBAA in n-dodecane–2-ethylhexanol solution) phases were performed with EXAFS spectroscopy. The extractability of Pt(IV) was much higher with EHBAA than with TOA in the studied HCl concentration range (0.2–8 M HCl); additionally, EHBAA selectively extracted Pt(IV) over Fe(III) under the condition of [EHBAA] ⩽ 0.1 M and [HCl] ⩽ 1 M. The Pt(IV) loading capacity of 0.1 M EHBAA was about 9.2 g/L (about 0.05 M). Most of the Pt(IV) extracted with 0.1 M EHBAA from 1 M HCl was stripped with 0.1 M NaOH; the co-extracted Fe(III) was selectively scrubbed with distilled water. The structural studies indicated that the Pt(IV) extracted with EHBAA from 1 M HCl formed an ion-pair complex, [PtCl6]·(EHBAA·H)2.

    本文言語English
    ページ(範囲)176-181
    ページ数6
    ジャーナルSeparation and Purification Technology
    177
    DOI
    出版ステータスPublished - 2017 4 28

    ASJC Scopus subject areas

    • Analytical Chemistry
    • Filtration and Separation

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