Heterogeneous Photocatalytic Decomposition of Phenol over TiO2 Powder
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ID: 307495
1985
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Abstract
Abstract The photocatalytic decomposition of phenol in oxygenated aqueous suspensions of lightly-reduced anatase TiO2, being the most satisfactory among the semiconductors investigated from the standpoint of the photocatalytic activity and stability, has been investigated at the optimum pH 3.5. The products at the initial stage of the reaction were hydroquinone, pyrocatechol, 1,2,4-benzenetriol, pyrogallol, and 2-hydroxy-1,4-benzoquinone. These intermediates underwent further photocatalytic oxidation via acids and/or aldehydes finally into CO2 and H2O. A reaction scheme involving hydroxyl radicals as real reactive species has been proposed. Although H2O2 was formed via O2\ewdot produced by electron trapping of adsorbed oxygen, its concentration remained constant at a low value during the reaction. About 0.7 mole of O2 was consumed for the consumption of one mole of phenol at the initial stage of the reaction. These results indicated that hydroxyl radicals were formed not only via holes but also via H2O2 from O2\ewdot. It was interesting from the viewpoint of wastewater treatment that phenol was completely mineralized to CO2 in the presence of TiO2 powder under solar irradiation without both aeration and mixing of the solution.
| Reference Key |
openalex_W2056062229
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| Authors | Ken‐ichi Okamoto, Yasunori Yamamoto, Hiroki Tanaka, Masashi Tanaka, Akira Itaya |
| Journal | bulletin of the chemical society of japan |
| Year | 1985 |
| DOI |
10.1246/bcsj.58.2015
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| URL | |
| Keywords | Keywords not found |
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