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Adsorption and photoelectrocatalytic characteristics of organics on TiO2 nanotube arrays

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Abstract

The adsorption and photoelectrocatalytic characteristics of four different kinds of organic compounds (d-fructose, glutamic acid, fumaric acid, and nicotinic acid) on TiO2 nanotube arrays (TNAs) were investigated using a thin-layer cell, wherein the compounds were rapidly and exhaustively oxidized. The photogenerated current–time (I ph–t) profiles were found to be related to the adsorption, the degradation rate, and the reaction mechanism. The relationship between the initial organic compounds concentrations and photocurrent peaks (I 0ph) fit the Langmuir type adsorption model well, thereby confirming that the adsorption of organic compounds on TNAs was via monolayer adsorption. The adsorption equilibrium constant was obtained from the Langmuir equation. The results indicate that the adsorption performance of the organic compounds on TNAs were in the following order: nicotinic acid < d-fructose < glutamic acid < fumaric acid. The degradation of organic compounds on TNAs was classified as either easy or difficult based on the time of complete mineralization (t end) of the organic samples under an equal holes consumption; the degree of degradation were as follows: fumaric acid < d-fructose < glutamic acid < nicotinic acid. The photoelectrocatalytic characteristics of the organic compounds on TNAs were also discussed by analyzing the changes in the I ph –t profiles.

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Acknowledgments

The project was supported by the National High Technology Research and Development Program of China (863) (2009AA063003), the National Nature Science Foundation of China (no. 20 677039), and R&D foundation of Shanghai Jiao Tong University. The authors would like to acknowledge Instrumental analysis center of Shanghai Jiao Tong University for materials characterization

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Authors and Affiliations

  1. School of Environmental Science and Engineering, Shanghai Jiao Tong University, No. 800 Dongchuan Road, Minhang District, Shanghai, 200240, People’s Republic of China

    Hongchong Chen, Di Li, Xuejin Li, Jinhua Li, Quanpeng Chen & Baoxue Zhou

  2. Key Laboratory for Thin Film and Microfabrication of the Ministry of Education, Shanghai, 200240, China

    Baoxue Zhou

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  1. Hongchong Chen
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  2. Di Li
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  3. Xuejin Li
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  4. Jinhua Li
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  5. Quanpeng Chen
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Correspondence to Baoxue Zhou.

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Chen, H., Li, D., Li, X. et al. Adsorption and photoelectrocatalytic characteristics of organics on TiO2 nanotube arrays. J Solid State Electrochem 16, 3907–3914 (2012). https://doi.org/10.1007/s10008-012-1837-x

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  • DOI: https://doi.org/10.1007/s10008-012-1837-x

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