Synergistic Extraction of Nickel by Liquid Surfactant Membranes

Katsushi Yamashita, Takahiko Kakoi, Hiroshi Kosaka, Masahiro Goto, Fumiyuki Nakashio

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    25 Citations (Scopus)


    Synergistic extraction of Ni(II) by a mixture of the active component in the commercial extractant LIX63, 5,8-dimethyl-7-hydroxydodecane-6-oxime, and dioleylphosphoric acid (DOLPA) has been investigated by liquid surfactant membranes (LSMs) containing a commercial surfactant, Span 80. Solvent extraction of Ni(II) with the mixture of LIX63 and an ordinary extradant, di(2-ethylhexyl)phosphoric acid (D2EHPA) was carried out. The results show that the LiX63-DOLPA mixture has a high synergistic effect on the extraction of Ni(II) in the LSM system compared with the LIX63-D2EHPA mixture. The synergistic effect of the LIX63-DOLPA mixture is attributed to a mixed ligand complex formation with the stoichiometry of Ni2+/LIX63/DOLPA = 1/2/2. Besides extractant synergism, the effects of several operation factors in the LSMs were investigated: permeation of Ni(II). pH of external aqueous phase, and concentrations of extradant and surfactant. The permeation mechanism of Ni(II) in LSMs has been elucidated by using the interfacial reaction model which takes into account the complex formation at the interface.

    Original languageEnglish
    Pages (from-to)369-385
    Number of pages17
    JournalSeparation Science and Technology
    Issue number3
    Publication statusPublished - 1998

    All Science Journal Classification (ASJC) codes

    • Chemistry(all)
    • Chemical Engineering(all)
    • Process Chemistry and Technology
    • Filtration and Separation


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