Photoelectrocatalytic Degradation of Organic Pollutants in Aqueous Solution Using a Pt‐TiO2 Film

International Journal of Photoenergy - Tập 2009 Số 1 - 2009
Chun He1, Mudar Abou Asi1, Ya Xiong1, Dong Shu2, Xiangzhong Li3
1School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China
2Key Lab of Electrochemical Technology on Energy Storage and Power Generation in Guangdong Universities, School of Chemistry and Environment, South China Normal University, Guangzhou, 510006, China
3Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hong Kong, China

Tóm tắt

A series of Pt‐TiO2 films with nanocrystaline structure was prepared by a procedure of photodeposition and subsequent dip‐coating. The Pt‐TiO2 films were characterized by X‐ray diffraction, scanning electronic microscope, electrochemical characterization to examine the surface structure, chemical composition, and the photoelectrochemical properties. The photocatalytic activity of the Pt‐TiO2 films was evaluated in the photocatalytic (PC) and photoelectrocatalytic (PEC) degradation of formic acid in aqueous solution. Compared with a TiO2 film, the efficiency of formic acid degradation using the Pt‐TiO2 films was significantly higher in both the PC and PEC processes. The enhancement is attributed to the action of Pt deposits on the TiO2 surface, which play a key role by attracting conduction band photoelectrons. In the PEC process, the anodic bias externally applied on the illuminated Pt‐TiO2 films can further drive away the accumulated photoelectrons from the metal deposits and promote a process of interfacial charge transfer.

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International Journal of Photoenergy

Tập 2009 Số 1

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