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.
- Issue Date
- Apr-2014
- Publisher
- Elsevier
- Citation
- Applied Catalysis B: Environmental, v.147, pp 642 - 650
- Pages
- 9
- Journal Title
- Applied Catalysis B: Environmental
- Volume
- 147
- Start Page
- 642
- End Page
- 650
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/159085
- DOI
- 10.1016/j.apcatb.2013.09.034
- ISSN
- 0926-3373
- 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 (λ>420nm). 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.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - 공과대학 > 화공생명공학부 > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.