Takayuki IKEMOTO
Effects of Foreign Metal Ion Incorporation the ¦Á-FeOOH Lattice Distortion caused by the Incorporation of Foreign Metal Ions on the Preferential Adsorption of Lead Ions
Kazunori Sato
Effects of the anisotropy occurred in the ¦Á-FeOOH (goethite) lattice on the preferential adsorption of lead ions have been investigated in an aqueous environment. The incorporation of foreign metal ions into the ¦Á-FeOOH lattice, which shows an anisotropic distortion in the lattice, resulted in an increase in the preferential adsorption. In particular, manganese-substituted ¦Á-FeOOH showed a remarkable increase in the adsorption of Pb(II) ions, which is caused by the anisotropic change for lattice parameter. However, cobalt or copper substituted ¦Á-FeOOH, whose lattice parameter change was isotropic, showed the same tendency with ¦Á-FeOOH on the adsorption of Pb(II), Cu(II) and Zn(II) ions. This anisotropic effect has been discussed for the preferential adsorption of Pb(II) ions. The preferential adsorption is most probably caused by the formation of new active sites, which is favorable for the Pb(II) ion adsorption.
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