The DOI matches its Crossref record; 2 of the 2 references it cites were found in a registry or an index.
Quantitative Detection of OH Radicals for Investigating the Reaction Mechanism of Various Visible-Light TiO2 Photocatalysts in Aqueous Suspension
Abstract
The reaction mechanism of visible-light responsive photocatalysts was explored by analyzing OH radicals ( • OH) quantitatively by means of a coumarin fluorescence probe method. The photocatalysts investigated were various modified TiO 2, i.e., nitrogen-doped, Pt-complex-deposited, Fe(III)-grafted, and Fe(III)-grafted Ru-doped TiO 2 . The formation rate of • OH was measured to calculate the • OH quantum yield from the absorbed intensity of 470 nm LED light. The highest quantum yield was obtained for Fe(III)-grafted Ru-doped TiO 2 . The • OH yield was increased on the addition of H 2 O 2 for the Fe(III)-grafted TiO 2, indicating that H 2 O 2 is supposedly a reaction intermediate for producing • OH. The photocatalytic activity for each sample was obtained by measuring CO 2 generation rate on the acetaldehyde decomposition in an aqueous suspension system and then it was compared with the • OH formation rate. Although the CO 2 generation rate is positively correlated with the • OH formation rate for each photocatalyst, the values of CO 2 generation were extremely larger than those of • OH. This finding indicates that the oxidation reaction takes place dominantly with surface trapped holes which probably exchange with the • OH in solution.
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Cites
Buxton, G. V., Greenstock, C. L., Helman, W. P., & Ross, A. B. (1988) · Journal of Physical and Chemical Reference Data · doi:10.1063/1.555805 · Cited by 12,332
Reduction potentials of one-electron couples involving free radicals in aqueous solution
Wardman, P. (1989) · Journal of Physical and Chemical Reference Data · doi:10.1063/1.555843 · Cited by 2,123
Cited by
Electrochemical Synthesis of H2O2 by Two-Electron Water Oxidation Reaction
Shi, X., Back, S., Gill, T. M., Siahrostami, S., & Zheng, X. (2021) · Chem · doi:10.1016/j.chempr.2020.09.013 · Cited by 429
Mechanism of the OH Radical Generation in Photocatalysis with TiO2 of Different Crystalline Types
Zhang, J., & Nosaka, Y. (2014) · The Journal of Physical Chemistry C · doi:10.1021/jp501214m · Cited by 396
Self-citationOng, W., Tan, L., Chai, S., Yong, S., & Mohamed, A. R. (2014) · ChemSusChem · doi:10.1002/cssc.201300924 · Cited by 339
Metadata
- Authors
- Zhang, J., & Nosaka, Y.
- Venue
- The Journal of Physical Chemistry C
- Publisher
- American Chemical Society (ACS)
- Published
- 2013-01-14
- Volume
- 117
- Issue
- 3
- Pages
- 1383-1391
- ISSN
- 1932-7447 (ISSN-L)
- 1932-7455
- OpenAlex
- W2334427761
- Cited by
- 192
- References
- 2
- FWCI
- 3.04
- Type
- journal article
- Language
- en
- Open access
- closed
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