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.
Keywords
LuminolCalcinationChemiluminescencePhotocatalysisSpectroscopyRadicalHydrothermal circulationPhotochemistryChemistryCrystallizationMaterials scienceInorganic chemistryCatalysisChemical engineeringOrganic chemistry
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Publication Info
- Year
- 2001
- Type
- article
- Volume
- 105
- Issue
- 29
- Pages
- 6993-6999
- Citations
- 114
- Access
- Closed
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Cite This
Tsutomu Hirakawa,
Hiroshi Kominami,
Bunsho Ohtani
et al.
(2001).
Mechanism of Photocatalytic Production of Active Oxygens on Highly Crystalline TiO<sub>2</sub> Particles by Means of Chemiluminescent Probing and ESR Spectroscopy.
The Journal of Physical Chemistry B
, 105
(29)
, 6993-6999.
https://doi.org/10.1021/jp0112929
Identifiers
- DOI
- 10.1021/jp0112929