Shinichi MUNEMURA
Removal of Heavy Metal Ions from an Aqueous Solution by Composite Particles Consisting of ¦Á-FeOOH and Ceria-Lanthania Oxide
Kazunori SATO
In order to remove hazardous heavy metal ions dissolved in an aqueous environment, the photodeposition effect on the removal of Pb(II), Cu(II), and Zn(II) has been investigated for the 10 mol%La2O3-CeO2 (LDC) photocatalyst oxide particles combined with fine ¦Á-FeOOH particles. The mixture of 1.0 mol%¦Á-FeOOH and LDC showed the highest photodeposition ability for Pb(II) ions under the photoirradiation. The removal efficiency of Pb(II) ions was high under the UV irradiation and it decrased with increasing the wavelength of light toward the visible region. This result indicates that the coexistence of fine ¦Á-FeOOH particles with LDC particles contribute an efficient separation of holes and electrons generated by the photoirradiation. The high-resolution scanning electron microscopic observation of the samples revaled that fine ¦Á-FeOOH particles supported on the surface of LDC particles are effective for the charge separation between holes and electrons. This effect is probably caused by the redox reaction occurring for the transfer of electrons to the surface of ¦Á-FeOOH-LDC particles. The ¦Á-FeOOH-LDC composite was also found to be effective for the removal of Cu(II) ions even at low concentrations.
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