Effect of sodium ions on the extraction of rare earth metals by liquid surfactant membranes containing a calix[4]arene carboxyl derivative

Takahiko Kakoi, Tatsuya Oshima, Takayuki Nishiyori, Fukiko Kubota, Masahiro Goto, Seiji Shinkai, Fumiyuki Nakashio

    Research output: Contribution to journalArticlepeer-review

    25 Citations (Scopus)

    Abstract

    A novel host compound calixarene has been applied as a mobile carrier for the separation and concentration of rare earth metals by liquid surfactant membranes (LSMs). Using the novel carrier, extraction of rare earth metals (He, Er and Y) by LSMs was systematically studied in a stirred cell. Extraction behavior of rare earth metals by the carboxyl derivative of calix[4]arene was found to be extremely sensitive to coexisting sodium ions in the feed solution. The extractability of rare earth metals was remarkably enhanced by the addition of sodium ions. The permeation rate of rare earth metals through the LSMs in the presence of sodium ions was 100-fold higher than that without sodium ions. This enhancement of the permeation rate is attributed to the preferential conformation change in the host compound of calixarene initiated by sodium ions. The permeation mechanism of rare earth metals by LSMs is elucidated by an interfacial reaction model.

    Original languageEnglish
    Pages (from-to)125-135
    Number of pages11
    JournalJournal of Membrane Science
    Volume143
    Issue number1-2
    DOIs
    Publication statusPublished - May 27 1998

    All Science Journal Classification (ASJC) codes

    • Biochemistry
    • General Materials Science
    • Physical and Theoretical Chemistry
    • Filtration and Separation

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