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Platinum-Nitrogen-Codoped TiO2 Photocatalyst: Effect of Acid Catalysts on Visible-Light Activity

Title
Platinum-Nitrogen-Codoped TiO2 Photocatalyst: Effect of Acid Catalysts on Visible-Light Activity
Authors
Ryu, J[Ryu, Jungho]Kim, S[Kim, Soonhyun]
DGIST Authors
Kim, S[Kim, Soonhyun]
Issue Date
2012
Citation
Materials Transactions, 53(12), 2200-2204
Type
Article
Article Type
Article
Keywords
4-Chlorophenol (4-Cp)4-CP DegradationAcetic AcidAcid CatalystCalcinationCatalystsCo-DopedDiffuse ReflectanceLightNitric AcidPhotocatalysisPhotoelectronsPlatinumnitrogen-Codoped TiO2Sample SurfaceScanning Electron MicroscopyScanning ElectronsSol-GelSol-GelsSurface AreaTiOTitanium DioxideTransmission Electron MicroscopyUV-VisibleVisible-LightVisible-Light ActivityVisible IrradiationX Ray DiffractionX Ray Photoelectron Spectroscopy
ISSN
1345-9678
Abstract
Platinumnitrogen- codoped TiO2 (PtNTiO2) was prepared by a conventional solgel process via the addition of different acid catalysts: nitric acid (HNO3), acetic acid (HAc) and both (HNO3HAc). The PtNTiO2 samples were then characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy and UVvisible diffuse reflectance analysis. The samples successfully exhibited visible-light-induced photocatalysis for the degradation of dichloroacetate (DCA) and 4-chlorophenol (4-CP). The HAc/450 sample (following the notation "added acid catalyst/calcination temperature") exhibited the highest visible activity for DCA degradation. This finding can be explained by the much stronger visible absorption of the calcined samples than the uncalcined samples and the slightly larger surface area of HAc/450 compared to other calcined TiO2 samples. However, the performance of 4-CP degradation was proportional to the PtNTiO2 sample surface area regardless of visible absorption, which could be ascribed to the fact that 4-CP degradation can occur through a surface-complex-mediated pathway under visible irradiation. © 2012 The Japan Institute of Metals.
URI
http://hdl.handle.net/20.500.11750/3408
DOI
10.2320/matertrans.M2012294
Publisher
Japan Institute of Metals
Related Researcher
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Collection:
Smart Textile Convergence Research Group1. Journal Articles


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