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Mechanism of photocatalytic production of active oxygens on highly crystalline TiO2 particles by means of chemiluminescent probing and ESR spectroscopy

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Title: Mechanism of photocatalytic production of active oxygens on highly crystalline TiO2 particles by means of chemiluminescent probing and ESR spectroscopy
Authors: Hirakawa, Tsutomu Browse this author
Kominami, Hiroshi Browse this author →KAKEN DB
Ohtani, Bunsho Browse this author →KAKEN DB
Nosaka, Yoshio Browse this author
Issue Date: 26-Jul-2001
Publisher: American Chemical Society
Journal Title: Journal of physical chemistry. B
Volume: 105
Issue: 29
Start Page: 6993
End Page: 6999
Publisher DOI: 10.1021/jp0112929
Abstract: The effect of calcination on photocatalytic activities was studied for highly crystalline TiO2 powder, which was synthesized by the method of hydrothermal crystallization in organic media (HyCOM). The productions of O2•-and H2O2 under ambient condition were monitored by means of luminol chemiluminescence probing. The amount of produced O2•- was decreased with the calcination at lower temperatures in parallel to the decrease of inner Ti3+ signal observed at 77 K by ESR spectroscopy. The formation route for H2O2 under aerated condition is mainly two-step O2 reduction in the presence of oxidizable organic molecules such as luminol. Oxidization activity was significantly high when HyCOM-TiO2 was calcined at higher temperatures, 973−1173 K, as monitored by the amount of oxidized luminol. The observation in ESR measurements and other evidences indicated that the luminol is oxidized via hydroxyl radicals rather than the direct oxidation by photoinduced surface trapped holes.
Type: article
URI: http://hdl.handle.net/2115/52790
Appears in Collections:触媒科学研究所 (Institute for Catalysis) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 大谷 文章

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