Ion Exchange Selectivity Coefficients of Cu(II) and Zn(II) Ions on kaolinite and bentonite.

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  • カオリナイトとベントナイトにおける銅イオンと亜鉛イオンの関与するイオン交換選択係数
  • カオリナイト ト ベントナイト ニ オケル ドウ イオン ト アエン イオン ノ カンヨ スル イオン コウカン センタク ケイスウ

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Abstract

The Gains-Thomas ion exchange selectivity coefficients, KGT of Cu2+ and Zn2+ on Casaturated kaolinite and bentonite were determined in order to grasp the selectivities of these ions on the phyllosilicates in comparison with Cat. Adsorption mechanism was also investigated by the determination of desorption of the ions adsorbed on the clays. The average ion exchange selectivity coefficients: KGT of Cu2+ to Ca-kaolinite was 1.3 with a variation of 0.5-2.1, and the KGT values of Zn2+ also approximated 1.3 with a range of 0.6-2.1. On Ca-bentonite, the average: KGT of Cu2+ and Zn2+ were 1.4 (range: 0.8-2.7) and 1.7 (range: 1.1-2.7), respectively. These results confirmed that Cu2+ and Zn2+ can be adsorbed on the surface of the phyllosilicates with the similar selectivity to alkaline-earth ions. Most adsorbed Cu2+ and Zn2+ (>70 %) on the clays can be desorbed with 1 mol Lammonium acetate extraction regardless of clay species and equilibrium pH, indicating that much of Cu2+ and Zn2+ are adsorbed on the phyllosilicates in fashion of ion exchange reaction.

Journal

  • ENVIRONMENTAL SCIENCE

    ENVIRONMENTAL SCIENCE 16 (5), 369-376, 2003

    SOCIETY OF ENVIRONMENTAL SCIENCE, JAPAN

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