Sari SASAKI
Preferential Adsorption of Heavy Metal Ions in an Aqueous Environment by the Proton-Exchanged Manganese Oxide
Kazunori SATO
It has reported that ¦Á-(Fe,Mn)OOH particles a preferential adsorption of Pb(II) ions in our laboratory. However, the preferential adsorption mechanism was not clear. In this research, ¦Ë-MnO2 has been focused on in the light of its crystal structure and the existence of surface protons compared to those in ¦Á-(Fe,Mn)OOH. ¦Ë-MnO2 is obtained by the the acid-treatment for the LiMn2O4 spinel. This acid-treatment forms a proton-exchanged manganese oxide spinel, which can be applied to a new ion-excahnger for the adsorption of heavy metal ions. An adsorption experiment for the heavy metal ions, Cu(II), Pb(II), and Zn(II) was conducted. The influence of the crystal structure and surface electric potential was examined. ¦Ë-MnO2 showed a preferential adsorption of Pb(II) ions in a mixture of Cu(II), Pb(II), and Zn(II) ions compared with ¦Á-FeOOH. It was found that the surface potential of the particles greatly influences adsorptive properties of these oxide particles
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