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Visible light photocatalytic activities of nitrogen and platinum-doped TiO<sub>2</sub>: Synergistic effects of co-dopants
Cited 71 time in
Web of Science
Cited 74 time in Scopus
- Authors
- Issue Date
- 2014-04
- Publisher
- ELSEVIER SCIENCE BV
- Citation
- APPLIED CATALYSIS B-ENVIRONMENTAL, Vol.147, pp.642-650
- Abstract
- The visible light photocatalytic activity of nitrogen doped TiO2 (N-TiO2) was enhanced with co-doping of Pt ions for the oxidative and reductive degradation of model substrates in gaseous and aqueous phases. The synthesized samples were characterized by various techniques (diffuse reflectance UV-Vis, XPS, XRD, FT-IR, HR-TEM, EDX and laser flash photolysis spectroscopy). The co-doping of N and Pt of TiO2 (Pt,N-TiO2) significantly enhanced the degradation of acetaldehyde (gas phase), and trichloroacetate (TCA) (aqueous phase), and the reduction of Cr(VI) (aqueous phase) under visible light (lambda > 420 nm). The observed visible light photocatalytic activity of Pt,N-TiO2 was markedly higher than the singly-doped TiO2 (Pt-TiO2 or N-TiO2). A time-resolved diffuse reflectance (TDR) study found that the presence of the different oxidation states of Pt (2+ and 4+) plays a crucial role in the charge trapping and transfer dynamics in Pt-TiO2. The TDR study of Pt,N-TiO2 further revealed that the synergistic effect of co-doping is attributed to the combined contribution of each dopant. Finally, the first principle calculations for the doped TiO2 suggested that the electronic interaction of Pt and N in TiO2 facilitates the charge carrier mobility and reduces the undesired recombination, leading to enhanced photocatalytic activity. (C) 2013 Elsevier B.V. All rights reserved.
- ISSN
- 0926-3373
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Related Researcher
- Graduate School of Public Health
- Department of Environmental Health Sciences
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