The DOI matches its Crossref record; 25 of the 25 references it cites were found in a registry or an index.
Mechanism of the OH Radical Generation in Photocatalysis with TiO2 of Different Crystalline Types
Abstract
The difference in the OH radical generation through photocatalytic reaction with distinct crystalline types of TiO 2 in aqueous suspension was explored by means of a fluorescence probe method. By employing two kinds of probe molecules with different adsorptivities, that is, coumarin and coumarin-3-carboxylic acid, we could detect OH radicals located near the TiO 2 surface and those in the bulk solution individually. The amount of the OH radicals near the TiO 2 surface was much larger than that in the solution, which diffused from the TiO 2 surface to the bulk solution. Rutile TiO 2 produced a much smaller amount of OH radicals as compared to anatase and anatase-contained TiO 2 . On the addition of H 2 O 2, the OH radical generation for pure anatase TiO 2 decreased but increased for rutile and rutile-contained TiO 2 . This difference could be explained as follows: at the surface of anatase TiO 2, trapped holes become adsorbed OH radicals, while at the rutile surface, Ti-peroxo (Ti-OO-Ti) produced by the combination of two trapped holes which correspond to the adsorbed H 2 O 2, could work as a catalyst for the OH radical generation from water.
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Metadata
- Authors
- Zhang, J., & Nosaka, Y.
- Venue
- The Journal of Physical Chemistry C
- Publisher
- American Chemical Society (ACS)
- Published
- 2014-05-07
- Volume
- 118
- Issue
- 20
- Pages
- 10824-10832
- ISSN
- 1932-7447 (ISSN-L)
- 1932-7455
- OpenAlex
- W2318043664
- Cited by
- 396
- References
- 25
- FWCI
- 7.64
- Type
- journal article
- Language
- en
- Open access
- closed
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