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

    Research output: Contribution to journalArticle

    7 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Pages (from-to)176-181
    Number of pages6
    JournalSeparation and Purification Technology
    Volume177
    DOIs
    Publication statusPublished - 2017 Apr 28

    Fingerprint

    Amides
    Amines
    Extended X ray absorption fine structure spectroscopy
    Ions
    Water
    octylamine

    Keywords

    • HCl
    • Iron
    • Platinum
    • Solvent extraction
    • Tertiary amine

    ASJC Scopus subject areas

    • Analytical Chemistry
    • Filtration and Separation

    Cite this

    Selective extraction of Pt(IV) over Fe(III) from HCl with an amide-containing tertiary amine compound. / Maeda, Motoki; Narita, Hirokazu; Tokoro, Chiharu; Tanaka, Mikiya; Motokawa, Ryuhei; Shiwaku, Hideaki; Yaita, Tsuyoshi.

    In: Separation and Purification Technology, Vol. 177, 28.04.2017, p. 176-181.

    Research output: Contribution to journalArticle

    Maeda, Motoki ; Narita, Hirokazu ; Tokoro, Chiharu ; Tanaka, Mikiya ; Motokawa, Ryuhei ; Shiwaku, Hideaki ; Yaita, Tsuyoshi. / Selective extraction of Pt(IV) over Fe(III) from HCl with an amide-containing tertiary amine compound. In: Separation and Purification Technology. 2017 ; Vol. 177. pp. 176-181.
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    abstract = "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.",
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    AU - Narita, Hirokazu

    AU - Tokoro, Chiharu

    AU - Tanaka, Mikiya

    AU - Motokawa, Ryuhei

    AU - Shiwaku, Hideaki

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    N2 - 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.

    AB - 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.

    KW - HCl

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    KW - Platinum

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    KW - Tertiary amine

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