| Loading effects of silver oxides upon generation of reactive oxygen species in semiconductor photocatalysis. | |
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MedLine Citation:
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PMID: 18473047 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Superoxide anion radical (O(2)(-*)) and OH radical generations in suspensions of Ag metal-, Ag(2)O-, or AgO-loaded TiO(2) and BiVO(4) photocatalysts in alkaline conditions (pH 12.0) were examined by means of a luminol chemiluminescence (CL) technique and a spin-trapping fluorescence one in which terephthalic acid reacts with an OH radical to afford the highly fluorescent 2-hydroxyterephthalic acid (TAOH), respectively. The observed luminol CL intensity was remarkably enhanced by the AgO loading on TiO(2) as well as BiVO(4). This can be explained by enhancement of O(2)(-*) production on the AgO-loaded photocatalysts caused by the synergetic effects on the thermocatalytic activity upon the AgO surface and the efficient electron-hole separation at the photocatalyst/AgO interface. On the other hand, loading effects of AgO on the TAOH formation were not so significant compared to those on the CL observation, though the TAOH formation rates for the TiO(2) samples were much larger than those for the BiVO(4) ones by about three orders of magnitude. The properties of O(2)(-*) and OH radical generations on these photocatalysts are discussed on the basis of the luminol CL kinetics and approximate band edge positions of TiO(2), BiVO(4), and silver oxides. |
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Authors:
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Shigeru Kohtani; Kazuhiro Yoshida; Toshiyasu Maekawa; Akihide Iwase; Akihiko Kudo; Hideto Miyabe; Ryoichi Nakagaki |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2008-03-31 |
Journal Detail:
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Title: Physical chemistry chemical physics : PCCP Volume: 10 ISSN: 1463-9076 ISO Abbreviation: Phys Chem Chem Phys Publication Date: 2008 May |
Date Detail:
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Created Date: 2008-05-13 Completed Date: 2008-08-05 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 100888160 Medline TA: Phys Chem Chem Phys Country: England |
Other Details:
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Languages: eng Pagination: 2986-92 Citation Subset: IM |
Affiliation:
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Department of Pharmacy, School of Pharmacy, Hyogo University of Health Sciences, Chuo-ku, Kobe, 650-8530, Japan. kohtani@huhs.ac.jp |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Bismuth
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chemistry* Catalysis Chemiluminescent Measurements Electron Spin Resonance Spectroscopy Fluorescence Hydrogen-Ion Concentration Hydroxyl Radical / chemistry Luminol / chemistry Molecular Structure Oxides / chemistry* Photochemistry Phthalic Acids / chemistry Reactive Oxygen Species / chemistry* Semiconductors Silver Compounds / chemistry* Time Factors Titanium / chemistry* Vanadates / chemistry* |
| Chemical | |
Reg. No./Substance:
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0/Oxides; 0/Phthalic Acids; 0/Reactive Oxygen Species; 0/Silver Compounds; 0/Vanadates; 13463-67-7/titanium dioxide; 14059-33-7/bismuth vanadium tetraoxide; 20667-12-3/disilver oxide; 3352-57-6/Hydroxyl Radical; 521-31-3/Luminol; 636-94-2/2-hydroxyterephthalic acid; 7440-32-6/Titanium; 7440-69-9/Bismuth |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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