Citation: LI Di, CHEN Hong-Chong, LI Jin-Hua, ZHOU Bao-Xue, CAI Wei-Min. Photoelectrocatalytic Performance and Reaction Mechanism of Different Organics upon Adsorption on a TiO₂ Nanotube Array Electrode[J]. Acta Physico-Chimica Sinica, ;2011, 27(09): 2153-2159. doi: 10.3866/PKU.WHXB20110910 shu

Photoelectrocatalytic Performance and Reaction Mechanism of Different Organics upon Adsorption on a TiO₂ Nanotube Array Electrode

1.
1. School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China;
2. Key Laboratory of Thin Film and Microfabrication Technology, Ministry of Education, Shanghai 200240, P. R. China

Received Date: 28 March 2011
Available Online: 7 July 2011
Fund Project: 国家高技术研究发展计划项目(863) (2009AA063003)资助 (863) (2009AA063003)

The kinetics and mechanism of the photoelectrocatalytic degradation of glucose with weak adsorption and potassium hydrogen phthalate with strong adsorption on a self-organized and highly ordered TiO₂ nanotube array (TNA) were investigated using a thin layer reactor in which the organic compounds were completely and quickly oxidized. The photogenerated current-time (I-t) profiles were used to analyze the microprocesses of the photoelectrochemical catalytic degradation on the TNA electrode. For glucose the I-t curve increased sharply initially and then decreased rapidly followed by a slow decrease. This is due to the weak adsorbability of glucose and it adsorbed slowly onto the surface of the TNA electrode from the bulk solution. However, the I-t curve for potassium hydrogen phthalate had quite a different trend as it increased sharply initially and then continued to increase and then decreased slowly and this was due to the strong adsorbability and mass existence of potassium hydrogen phthalate on the electrode and, in addition, the low degradability of phthalic acid. The adsorption properties and adsorption coefficient of the organic compounds and the reaction mechanism were also analyzed. We conclude that the obtained photoelectrocatalytic oxidation rate of the organic compounds in the thin-layer cell assisted in determining the surface reaction process and the micro-mechanism of organic compound degradation on the TNA electrode.
- Glucose,
- potassium hydrogen phthalate,
- TiO2 nanotube array electrode,
- Thin-layer cell
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1.
沈阳化工大学材料科学与工程学院沈阳 110142

Photoelectrocatalytic Performance and Reaction Mechanism of Different Organics upon Adsorption on a TiO2 Nanotube Array Electrode

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通讯作者: 陈斌, bchen63@163.com

Photoelectrocatalytic Performance and Reaction Mechanism of Different Organics upon Adsorption on a TiO₂ Nanotube Array Electrode