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Photocatalytic ˙OH radical formation in TiO2aqueous suspension studied by several detection methods
Abstract
Photoinduced reaction with TiO2 semiconductor photocatalysts was investigated by using nitroxide radicals as spin probes for ˙OH radicals. The effects of some additives such as I−, Cl−, ClO4−, methanol and 2-propanol on the photocatalytic decay of nitroxide radicals, 3-carboxy-2,2,5,5-tetramethyl-1-pyrrolidine-1-oxyl and 4-carboxy-2,2,6,6-tetramethylpiperidine-1-oxyl, were investigated. Among the additives, only iodide ions that can be oxidized by trapped holes prohibited significantly the decay of the nitroxide radicals, indicating that trapped holes oxidize nitroxide probe radicals. For several TiO2 photocatalysts, the apparent quantum efficiency of ˙OH radical formation was calculated and compared with those obtained by the other detection methods, such as DMPO spin trapping and terephthalic acid fluorescence methods. The experimental observations suggest that the photocatalytic oxidation should be caused more preferably by trapped holes or adsorbed ˙OH radicals, rather than the photoinduced valence band holes in semiconductor and the free ˙OH radicals in solution.
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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
TiO2 photocatalysis: Design and applications
Nakata, K., & Fujishima, A. (2012) · Journal of Photochemistry and Photobiology C: Photochemistry Reviews · doi:10.1016/j.jphotochemrev.2012.06.001 · Cited by 3,651
Wang, L., Lan, X., Peng, W., & Wang, Z. (2021) · Journal of Hazardous Materials · doi:10.1016/j.jhazmat.2020.124436 · Cited by 689
Chen, Y., Yang, S., Wang, K., & Lou, L. (2005) · Journal of Photochemistry and Photobiology A: Chemistry · doi:10.1016/j.jphotochem.2004.11.006 · Cited by 466
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-citationImanishi, A., Okamura, T., Ohashi, N., Nakamura, R., & Nakato, Y. (2007) · Journal of the American Chemical Society · doi:10.1021/ja073206+ · Cited by 254
Metadata
- Authors
- Nosaka, Y., Komori, S., Yawata, K., Hirakawa, T., & Nosaka, A. Y.
- Venue
- Phys. Chem. Chem. Phys.
- Publisher
- Royal Society of Chemistry (RSC)
- Published
- 2003
- Volume
- 5
- Issue
- 20
- Pages
- 4731-4735
- ISSN
- 1463-9076 (ISSN-L)
- 1463-9084
- OpenAlex
- W2093031590
- Cited by
- 230
- References
- 2
- FWCI
- 4.50
- Type
- journal article
- Language
- en
- Open access
- closed
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- Nosaka, Y., Komori, S., Yawata, K., Hirakawa, T., & Nosaka, A. Y. (2003). Photocatalytic ˙OH radical formation in TiO2aqueous suspension studied by several detection methods. Phys. Chem. Chem. Phys. https://doi.org/10.1039/b307433a
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