STUDY OF THE SURFACE STATES AND ACTIVITY OF APt/TiO2PHOTOCATALYST

Liqun Mao (), Qinglin Li, Hongxin Dang and Zhijun Zhang
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Liqun Mao: State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China;
Qinglin Li: State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
Hongxin Dang: State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China;
Zhijun Zhang: Laboratory of Special Functional Materials, Henan University, Kaifeng 475001, China

Surface Review and Letters (SRL), 2004, vol. 11, issue 01, 111-115

Abstract: This paper deals with the correlation of surface states and photoactivity of aPt/TiO2catalyst prepared by means of photoreduction of${\rm PtCl}_6^{2-}$on anatase nano-TiO2powders. Conductivity measurements of pressed powders and XPS were applied in analysis of the surface states energy levels and chemical states ofPtat the nano-TiO2surface, respectively. The results revealed a new surface state with the energy level of 0.35 eV, lower than the conduction band edge ofTiO2. According to the XPS analysis, the new surface state can be attributed to thePt0clusters deposited on the surface ofTiO2particles. The photoactivity of the as-preparedPt/TiO2catalyst was characterized by photodecoloration of brilliant red X-3B in aqueous solution. The experimental results indicated that the photoactivity of thePt/TiO2catalyst is much higher than that ofTiO2. The surfacePt0clusters possibly function as trapping centers of generated electrons, resulting in the promotion of photocatalytic activity.

Keywords: Surface states; conductivity measurements; XPS; Pt/TiO2photocatalyst (search for similar items in EconPapers)
Date: 2004
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DOI: 10.1142/S0218625X04005949

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