Photo-swing extraction system for lanthanide separation by a thermosensitive polymer gel combined with carbon nanotubes

Syouhei Nishihama, Kayo Ohsawa, Yasushi Yamada, Kazuharu Yoshizuka, Tsuyohiko Fujigaya, Naotoshi Nakashima

    Research output: Contribution to journalArticlepeer-review

    8 Citations (Scopus)


    A novel photo-swing extraction system for lanthanide separation was developed using an acid phosphoxy ethyl methacrylate (Phosmer-M) copolymerized thermosensitive polymer gel and N-isopropylacrylamide (NIPAM) combined with single-walled carbon nanotubes (CNTs) as the extracting material. The swelling and shrinking phase transition of the Phosmer-M/NIPAM/CNT gel was successfully induced by photo-irradiation with a halogen lamp because of the heat generation by the CNTs, which occurred upon visible light absorption. The extraction ability of Eu(III) increased upon photo-irradiation because of changes in the volume and hydrophobicity of the composite gel. The ratio of the distribution coefficient with and without photo-irradiation (K dphoto/K d25) increased with an increase in the pH. The composite gel possessed sufficient loading and release capacities for Eu(III), La(III) and Lu(III) in repeated processes after photo-irradiation. The selectivity for Eu(III) over La(III) in binary metal systems increased due to photo-irradiation because the observed improvement in the extraction of Eu(III) was greater than that of La(III) during the phase transition of the gel.

    Original languageEnglish
    Pages (from-to)142-147
    Number of pages6
    JournalReactive and Functional Polymers
    Issue number2
    Publication statusPublished - Feb 2012

    All Science Journal Classification (ASJC) codes

    • Chemistry(all)
    • Environmental Chemistry
    • Biochemistry
    • Chemical Engineering(all)
    • Polymers and Plastics
    • Materials Chemistry


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