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Generation and Deactivation Processes of Superoxide Formed on TiO2 Film Illuminated by Very Weak UV Light in Air or Water
Abstract
Kinetics of photogenerated O 2 - under very weak light illumination (1 μW cm -2 ) at the air−TiO 2 interface as well as the water−TiO 2 interface were studied quantitatively by measuring the chemiluminescence from luminol dropped on TiO 2 film-type photocatalysts. The total number of steady-state O 2 - on TiO 2 surface was determined from the chemiluminescence intensity; about 1 × 10 14 cm -2 at the air−TiO 2 interface and about 2 × 10 14 cm -2 at the water−TiO 2 interface. From the initial relation between illuminated number of photons and generated number of O 2 -, the generation yield of O 2 - was estimated to be about 40% at the air−TiO 2 interface and about 80% at the water−TiO 2 interface. The generation and deactivation kinetics suggest that O 2 - is recombined with a trapped hole on the surface and releases an electron to TiO 2, producing free oxygen, and that most O 2 - do not migrate into the air or water bulk, but exist as adsorbed form on TiO 2 .
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Citations
Cited by
TiO2 photocatalysis and related surface phenomena
FUJISHIMA, A., ZHANG, X., & TRYK, D. (2008) · Surface Science Reports · doi:10.1016/j.surfrep.2008.10.001 · Cited by 6,737
Self-citationInfrared Spectra of Photoinduced Species on Hydroxylated Titania Surfaces
Szczepankiewicz, S. H., Colussi, A. J., & Hoffmann, M. R. (2000) · The Journal of Physical Chemistry B · doi:10.1021/jp0007890 · Cited by 326
Oxidation Mechanism of As(III) in the UV/TiO2 System: Evidence for a Direct Hole Oxidation Mechanism
Yoon, S.-H., & Lee, J. H. (2005) · Environmental Science & Technology · doi:10.1021/es051148r · Cited by 194
Metadata
- Authors
- Ishibashi, K.-I., Fujishima, A., Watanabe, T., & Hashimoto, K.
- Venue
- The Journal of Physical Chemistry B
- Publisher
- American Chemical Society (ACS)
- Published
- 2000-05-01
- Volume
- 104
- Issue
- 20
- Pages
- 4934-4938
- ISSN
- 1520-5207 (ISSN-L)
- 1520-6106
- OpenAlex
- W2081610814
- Cited by
- 183
- References
- 0
- FWCI
- 11.02
- Type
- journal article
- Language
- en
- Open access
- closed
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- Ishibashi, K.-I., Fujishima, A., Watanabe, T., & Hashimoto, K. (2000). Generation and Deactivation Processes of Superoxide Formed on TiO2 Film Illuminated by Very Weak UV Light in Air or Water. The Journal of Physical Chemistry B. https://doi.org/10.1021/jp9942670
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