|
1 Department of Nuclear Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
2 Research Institute for Advanced Science and Technology,
Osaka Prefectural University,
1-2 Gakuen, Sakai, Osaka 599-8570, Japan
3 Central Research Institute, Naka research Center, Mitsubishi Materials Corporation,
Naka-nachi, Naka-gun, Ibaraki 311-0102, Japan
4 Japan Science and Technology Corporation, 4-1-8 Hon-cho, Kawaguchi, Saitarma 332-0012, Japan
| Gamma-ray radiolysis of aqueous phenol solutions dispersing TiO2 or Al2O3 nanoparticles was investigated. Organic compounds, including phenol and aromatic intermediates induced by the radiolysis, were effectively removed from the aqueous phase in the presence of the nanoparticles, and the Al2O3 showed higher efficiency. Generation of inorganic gases was, however, suppressed in the presence of the nanoparticles. The removal of the organic compounds from the aqueous phase is partly explained by the adsorption of the aromatic intermediates to the nanoparticles. For the removal of the organic compounds, addition of the nanoparticles before the gamma- ray irradiation was more effective than addition after the irradiation. A reaction that enhances the removal of organic compounds seemed to proceed in the presence of the nanoparticles. |
full paper (pdf, 146 Kb)