DIVALENT HEAVY METAL SELECTIVITY COEFFICIENTS ON KAOLINITE AND BENTONITE
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概要
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In order to grasp the adsorptive selectivities of heavy metal ions on the phyllosilicates, the Gains-Thomas ion exchange selectivity coefficients, K_<GT> of Cd^<2+>, Cu^<2+>, Pb^<2+> and Zn^<2+> on Ca-saturated kaolinite and bentonite were determined in comparison with Ca^<2+>. Adsorption mechanism was also estimated by the determination in desorption of the ions adsorbed on the phyllosilicates. The average K_<GT^S> (min.-max.) on the Ca-kaolinite were 1.0 (0.7-1.3) for Cd^<2+>, 1.3 (0.5-2.1) for Cu^<2+>, 4.5 (3.3-5.6) for Pb^<2+> and 1.3 (0.6-2.1) for Zn^<2+>. On the Ca-bentonite, the average K_<GT^S> (min.-max.) were 1.0 (0.7-1.9) for Cd^<2+>, 1.4 (0.8-2.7) for Cu^<2+>, 1.9 (1.5-2.5) for Pb^<2+> and 1.7 (1.1-2.7) for Zn^<2+>. These results indicated that Cd^<2+> has the same adsorptive selectivity onto the surfaces of the phyllosilicates as Ca^<2+>. The selectivity of Pb^<2+> to kaolinite was found to be specifically higher than those of the other heavy metal ions. It was confirmed that Cu^<2+> and Zn^<2+> can be adsorbed on the surface of the phyllosilicates with the slightly higher selectivities than the alkaline-earth metal ion. Except for Pb^<2+> on kaolinite, most Cd^<2+>, Cu^<2+> and Zn^<2+> (>70%) adsorbed on the phyllosilicates can be desorbed with the 1mol dm^<-3> (mol L^<-1>) ammonium acetate extraction regardless of clay species and adsorptive equilibrium pH, indicating that many Cd^<2+>, Cu^<2+> and Zn^<2+> are adsorbed on the phyllosilicates in fashion of ion exchange reaction. Half of Pb adsorbed on kaolinite was desorbed with the 1mol L^<-1> ammonium acetate extraction and 25% was extracted by 1mol L^<-1> HCl, implying the possibility of specific sorption of some Pb^<2+> on the phyllosilicate.
- 日本粘土学会の論文
- 2004-12-00
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