Heterogeneous photocatalytic decomposition of phenol over TiO2 powder.
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概要
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The photocatalytic decomposition of phenol in oxygenated aqueous suspensions of lightly-reduced anatase TiO<SUB>2</SUB>, 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 <I>via</I> acids and/or aldehydes finally into CO<SUB>2</SUB> and H<SUB>2</SUB>O. A reaction scheme involving hydroxyl radicals as real reactive species has been proposed. Although H<SUB>2</SUB>O<SUB>2</SUB> was formed <I>via</I> O<SUB>2</SUB><SUP>\newdot</SUP> produced by electron trapping of adsorbed oxygen, its concentration remained constant at a low value during the reaction. About 0.7 mole of O<SUB>2</SUB> 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 <I>via</I> holes but also <I>via</I> H<SUB>2</SUB>O<SUB>2</SUB> from O<SUB>2</SUB><SUP>\newdot</SUP>. It was interesting from the viewpoint of wastewater treatment that phenol was completely mineralized to CO<SUB>2</SUB> in the presence of TiO<SUB>2</SUB> powder under solar irradiation without both aeration and mixing of the solution.
- 公益社団法人 日本化学会の論文
著者
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Okamoto Ken-ichi
Department Of Advanced Materials Science & Engineering Faculty Of Engineering Yamaguchi Universi
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Yamamoto Yasunori
Department Of Chemistry Faculty Of Science Okayama University
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Tanaka Hiroki
Department Of Applied Physics University Of Miyazaki
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TANAKA Masashi
Department of Biology, Faculty of Science, Tokyo Metropolitan University
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Itaya Akira
Department of Chemical Engineering, Faculty of Engineering, Yamaguchi University
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Yamamoto Yasunori
Department of Chemical Engineering, Faculty of Engineering, Yamaguchi University
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