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Preparation and activity evaluation of relative p–n junction photocatalyst Co-TiO2/TiO2

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Abstract

Co-TiO2 photocatalyst was prepared by a sol–gel method using Co(NO3)2 · 6H2O and tetrabutyl titanate [Ti(OC4H9)4] as raw materials, and Co-TiO2/TiO2 photocatalyst was synthesized by mixing the Co-TiO2 sol with TiO2 sol. The Co-TiO2/TiO2 was characterized by X-ray powder diffraction, UV–Vis diffuse reflection spectrum, scanning electron microscopy, transmission electron microscopy, fluorescence spectra and X-ray photoelectron spectroscopy. The photocatalytic activity of the photocatalyst was evaluated by photocatalytic reduction of Cr2O7 2− and photocatalytic oxidation of methyl orange under UV irradiation. The results showed that, for the photocatalytic reduction of Cr2O7 2−, the optimum percentage of Co-doped for the Co-TiO2 was 0.5% (mole ratio of Co/Ti), and the optimum percentage of Co-TiO2 for the Co-TiO2/TiO2 was 2.0% (mole ratio of Co-TiO2/TiO2). The photocatalytic reduction activities of the Co-TiO2/TiO2 and Co-TiO2 are much higher than that of TiO2. However, the photocatalytic oxidation activities of the Co-TiO2/TiO2 and Co-TiO2 are much lower than that of TiO2. Effects of heat treatment on the photocatalytic activities of the Co-TiO2/TiO2 and Co-TiO2 were investigated. The mechanisms of influence on the photocatalytic activity were also discussed.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (No. 20673042, 20973071) and the Key Project of Science and Technology Research of Ministry of Education of China (208062).

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Authors and Affiliations

  1. Department of Chemistry, Huaibei Coal Normal College, 235000, Huaibei, Anhui, People’s Republic of China

    Chen Shifu, Liu Wei & Zhang Sujuan

  2. School of Ocean Sciences, China University of Geosciences, 100083, Beijing, People’s Republic of China

    Chen Yinghao

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  1. Chen Shifu
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  2. Liu Wei
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  3. Zhang Sujuan
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  4. Chen Yinghao
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Correspondence to Chen Shifu.

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Shifu, C., Wei, L., Sujuan, Z. et al. Preparation and activity evaluation of relative p–n junction photocatalyst Co-TiO2/TiO2 . J Sol-Gel Sci Technol 54, 258–267 (2010). https://doi.org/10.1007/s10971-010-2179-8

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  • DOI: https://doi.org/10.1007/s10971-010-2179-8

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