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Visible Light Active Platinum-Ion-Doped TiO2 Photocatalyst
Abstract
Platinum-ion-doped TiO2 (Pt(ion)-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. Pt(ion)-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. Pt(ion)-TiO2 exhibited higher photocatalytic activities than undoped TiO2 under UV irradiation as well. The visible light activity of Pt(ion)-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, Pt(ion)-TiO2 degraded dichloroacetate and 4-chlorophenol through an oxidative path and trichloroacetate via a reductive path. The activity of Pt(ion)-TiO2 was not reduced when used repeatedly under visible light. However, visible-light-illuminated Pt(ion)-TiO2 could not degrade substrates such as tetramethylammonium and trichloroethylene, which are degraded with UV-illuminated TiO2. The characteristics and reactivities of Pt(ion)-TiO2 as a new visible light photocatalyst were investigated in various ways and discussed in detail.
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Shannon, R. D. (1976) · Acta Crystallographica Section A · doi:10.1107/s0567739476001551 · Cited by 66,145
Environmental applications of semiconductor photocatalysis
Hoffmann, M. R., Martin, S. T., Choi, W., & Bahnemann, D. W. (1995) · Chemical Reviews · doi:10.1021/cr00033a004 · Cited by 18,495
Self-citation
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Metadata
- Authors
- Kim, S., Hwang, S.-J., & Choi, W.
- Venue
- The Journal of Physical Chemistry B
- Publisher
- American Chemical Society (ACS)
- Published
- 2005-12-01
- Volume
- 109
- Issue
- 51
- Pages
- 24260-24267
- ISSN
- 1520-5207 (ISSN-L)
- 1520-6106
- OpenAlex
- W2155294299
- Cited by
- 408
- References
- 2
- FWCI
- 6.26
- Type
- journal article
- Language
- en
- Open access
- closed
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