Visible Light Photocatalytic Activities of Nitrogen and Platinum-Doped TiO2: Synergistic Effects of Co-dopants
SCIE
SCOPUS
- Title
- Visible Light Photocatalytic Activities of Nitrogen and Platinum-Doped TiO2: Synergistic Effects of Co-dopants
- Authors
- Kim, W; Tachikawa, T; Kim, H; Lakshminarasimhan, N; Murugan, P; Park, H; Majima, T; Choi, W
- Date Issued
- 2014-04-05
- Publisher
- ELSEVIER SCIENCE BV
- 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.
- Keywords
- Visible light photocatalysis; Titanium dioxide; Dopants; Band structure; Photooxidation and photoreduction; CODOPED TIO2; ENVIRONMENTAL APPLICATIONS; SURFACE FLUORINATION; TITANIUM-DIOXIDE; ABSORPTION; MECHANISM; NANOPARTICLES; SPECTROSCOPY; DEGRADATION; OXIDATION
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/15052
- DOI
- 10.1016/J.APCATB.2013.09.034
- ISSN
- 0926-3373
- Article Type
- Article
- Citation
- APPLIED CATALYSIS B-ENVIRONMENTAL, vol. 147, page. 642 - 650, 2014-04-05
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- There are no files associated with this item.
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