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Molecules 2014, 19(11), 18248-18267; doi:10.3390/molecules191118248

Spectroscopic Investigation of the Mechanism of Photocatalysis

Nagaoka University of Technology, 1603-1 Kamitomioka, Nagaoka 940-2188, Japan
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Received: 1 September 2014 / Revised: 21 October 2014 / Accepted: 27 October 2014 / Published: 7 November 2014
(This article belongs to the Special Issue Photocatalysis)
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Abstract

Reaction mechanisms of various kinds of photocatalysts have been reviewed based on the recent reports, in which various spectroscopic techniques including luminol chemiluminescence photometry, fluorescence probe method, electron spin resonance (ESR), and nuclear magnetic resonance (NMR) spectroscopy were applied. The reaction mechanisms elucidated for bare and modified TiO2 were described individually. The modified visible light responsive TiO2 photocatalysts, i.e., Fe(III)-deposited metal-doped TiO2 and platinum complex-deposited TiO2, were studied by detecting paramagnetic species with ESR, •O2 (or H2O2) with chemiluminescence photometry, and OH radicals with a fluorescence probe method. For bare TiO2, the difference in the oxidation mechanism for the different crystalline form was investigated by the fluorescence probe method, while the adsorption and decomposition behaviors of several amino acids and peptides were investigated by 1H-NMR spectroscopy. View Full-Text
Keywords: ESR; NMR; OH radical; superoxide radical; H2O2; acetaldehyde; metal doped TiO2; glutathione; amino acids; visible-light responsive photocatalysts ESR; NMR; OH radical; superoxide radical; H2O2; acetaldehyde; metal doped TiO2; glutathione; amino acids; visible-light responsive photocatalysts
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Nosaka, Y.; Nishikawa, M.; Nosaka, A.Y. Spectroscopic Investigation of the Mechanism of Photocatalysis. Molecules 2014, 19, 18248-18267.

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