NDLI: Promoting effects of H<sub>2</sub> on photooxidation of volatile organic pollutants over Pt/TiO<sub>2</sub>

Content Provider	Royal Society of Chemistry (RSC)
Author	Wu, Ling Fu, Xianzhi Li, Danzhen Chen, Yilin Wang, Xuxu Wang, Xinchen
Copyright Year	2005
Abstract	Superior photocatalytic activity and durability of Pt/TiO2 for decomposing volatile organic pollutants (typically aromatic compounds) have been obtained by adding trace H2 into an O2-rich photooxidation system. The order of photodegradation efficiencies for volatile organic compounds is cyclohexane < acetone < benzene < toluene < ethylbenzene. Exceptional stability of Pt/TiO2 for benzene photodegradation is still maintained after 22 h of testing, by the repeated use of the catalyst four times. The promoting effects of H2 in the photocatalysis were studied by infrared spectroscopy (IR), spin-trapping electron paramagnetic resonance (EPR) and surface photovoltage spectroscopy (SPS). Results demonstrated that the introduced H2 has several beneficial effects on heterogeneous photocatalysis, namely, a comparatively clean surface of Pt/TiO2 with no persistent aromatic intermediates, an increased number of surface hydroxyl radicals in the photocatalytic process, and an enhanced separation efficiency of photogenerated electron–hole pairs. A mechanism is proposed to elucidate the promoting effect of H2 on the photooxidation of volatile organic pollutants over Pt/TiO2.
Starting Page	1514
Ending Page	1519
Page Count	6
File Format	HTM / HTML PDF
ISSN	11440546
Volume Number	29
Issue Number	12
Journal	New Journal of Chemistry
DOI	10.1039/b510953a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	Photodegradation Infrared spectroscopy Spectroscopy Oxygen EPR Toluene Photocatalysis Volatile organic compound Ethylbenzene Surface photovoltage Benzene Cyclohexane Electron paramagnetic resonance Hydroxyl radical Acetone
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry Catalysis

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Promoting effects of H2 on photooxidation of volatile organic pollutants over Pt/TiO2

Promoting effects of H₂ on photooxidation of volatile organic pollutants over Pt/TiO₂