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Visible light active platinum-ion-doped TiO2 photocatalyst

Title
Visible light active platinum-ion-doped TiO2 photocatalyst
Authors
Kim, S[Kim, S]Hwang, SJ[Hwang, SJ]Choi, WY[Choi, WY]
DGIST Authors
Kim, S[Kim, S]
Issue Date
2005-12-29
Citation
Journal of Physical Chemistry B, 109(51), 24260-24267
Type
Article
Article Type
Article
Keywords
Chlorinated Organic CompoundsDegraded DichloroacetateElectron SpectroscopyHigher Photocatalytic ActivitiesIrradiationLight-Illuminated PtOrganic CompoundsOxidationPhotocatalysisPlatinumReductionSol-GelsTitanium DioxideX-Ray Absorption Spectroscopy
ISSN
1520-6106
Abstract
Platinum-ion-doped TiO2 (Ption-TiO2) was synthesized by a sol-gel method, and its visible light photocatalytic activities were successfully demonstrated for the oxidative and reductive degradation of chlorinated organic compounds. Ption-TiO2 exhibited a yellow-brown color, and its band gap was lower than that of undoped TiO2 by about 0.2 eV. The flat band potential of Pt ion-TiO2 was positively shifted by 50 mV compared with that of undoped TiO2. X-ray absorption spectroscopy and X-ray photoelectron spectroscopy analyses showed that the Pt ions substituted in the TiO2 lattice were present mainly in the Pt(IV) state with some Pt(II) on the sample surface. Ption-TiO2 exhibited higher photocatalytic activities than undoped TiO2 under UV irradiation as well. The visible light activity of Ption-TiO2 was strongly affected by the calcination temperature and the concentration of Pt ion dopant, which were optimal at 673 K and 0.5 atom %, respectively. Under visible irradiation, Ption-TiO2 degraded dichloroacetate and 4-chlorophenol through an oxidative path and trichloroacetate via a reductive path. The activity of Ption-TiO2 was not reduced when used repeatedly under visible light. However, visible-light-illuminated Ption-TiO2 could not degrade substrates such as tetramethylammonium and trichloroethylene, which are degraded with UV-illuminated TiO2. The characteristics and reactivities of Ption-TiO2 as a new visible light photocatalyst were investigated in various ways and discussed in detail. © 2005 American Chemical Society.
URI
http://hdl.handle.net/20.500.11750/2530
DOI
10.1021/jp055278y
Publisher
American Chemical Society
Related Researcher
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Collection:
Smart Textile Convergence Research Group1. Journal Articles


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