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Visible light photocatalytic activities of nitrogen and platinum-doped TiO2: Synergistic effects of co-dopants

Authors
Kim, WooyulTachikawa, , TakashiKim, HwajinLakshminarasimhan, NarayananMurugan, PalanichamyPark, , HyunwoongMajima, TetsuroChoi, Wonyong
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.
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