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Synthesis of C-N-S co-doped TiO2 mischcrystal with isobandgap property and their photocatalytic activities under visible light

Abstract

We report a simple thermal decomposition synthesis route of C-N-S co-doped TiO2 mischcrystal with isobandgap property for visible light application by using urea as carbon, nitrogen sources and Ti(SO4)2 as sulfur sources. The C-N-S co-doped TiO2 mischcrystal exhibited unique isobandgap characteristic and prominent red-shift in the UV-visible absorption spectrum and much narrower band gap (2.42 and 1.39 eV) due to defects and impurity levels confirmed by powder X-ray diffraction, diffuse reflectance spectroscopy (DRS), photoluminescence (PL), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). The excellent photocatalytic performance of the C-N-S co-doped TiO2 mischcrystal samples was demonstrated by degradation of MB under visible light. The apparent rate of black TiO2 is 4-7 times higher than that of C-N-S co-doped TiO2 (anatase and rutile) under visible light irradiation. The valence band XPS and DRS results were carefully examined to understand the band gap reduction of C-N-S co-doped TiO2. This study confirms that the band gap structure of C-N-S co-doped TiO2 is determined by mixed crystalline structure, defective core on the surface of TiO2 and 2D morphology. We present a new idea that will be useful for the design of band gap structure for photocatalysts with higher photocatalytic activities under visible light irradiation.

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Publication details

The article was received on 18 Feb 2018, accepted on 07 Jul 2018 and first published on 12 Jul 2018


Article type: Paper
DOI: 10.1039/C8CY00353J
Citation: Catal. Sci. Technol., 2018, Accepted Manuscript
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    Synthesis of C-N-S co-doped TiO2 mischcrystal with isobandgap property and their photocatalytic activities under visible light

    Y. Guo, T. Guo, J. Chen, J. Wei, L. Bai, X. Ye, Z. Ding, W. Xu and Z. Zhou, Catal. Sci. Technol., 2018, Accepted Manuscript , DOI: 10.1039/C8CY00353J

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