Magnetic Removal of Cesium Ions Using γ-Poly(glutamic acid)-Coated Magnetite Particles with the Enhanced Effect of Zeolite Supplementation

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  • Thuy Le Thi Xuan
    Department of Chemical Science and Technology, Institute of Technology and Science, The University of Tokushima Faculty of Environmental Engineering, Danang University of Technology
  • Yasuzawa Mikito
    Department of Chemical Science and Technology, Institute of Technology and Science, The University of Tokushima
  • Yabutani Tomoki
    Department of Chemical Science and Technology, Institute of Technology and Science, The University of Tokushima

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Magnetic removal of cesium ions (Cs) by γ-poly(glutamic acid)-coated magnetite particles (PGA-MPs) was investigated using a variety of waters. Cs was sufficiently removed from fresh water in a pH range from 7.0 to 9.0, with a removal efficiency of higher than 80% by using 5 wt % PGA-MPs, while that from artificial seawater was limited to 30%. Zeolite particles were employed as a supplementary adsorbent to adsorb Cs before the collection of zeolite with PGA-MPs. The addition of 1 wt % zeolite particles enhanced the recovery of Cs up to 97.7 ± 0.2% for fresh water and the amount of PGA-MPs required for the treatment was reduced to 0.2 wt %. Nevertheless, such improvement was not observed for artificial seawater treatment. The zeolite supplementation method performed sufficiently on the recovery of Cs in tap water and spring water, and their recoveries were both higher than 93% with R.S.D. of less than 1%. These results strongly suggest that the provided procedure can be practically applied to the removal of Cs from various inland waters.

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