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A situ hydrothermal synthesis of a two-dimensional MoS2/TiO2 heterostructure composite with exposed (001) facets and its visible-light photocatalytic activity

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Abstract

Two-dimensional (2D) MoS2/TiO2 heterostructure composites with exposed (001) facets (MT-001) were fabricated through a situ hydrothermal method. The microstructure and composition of the composite material were characterized by XRD, TEM, and XPS. TEM results showed that the composite consisted of well-defined sheet-shaped structures with a rectangular outline and a length of approximately 80–140 nm. XPS results demonstrated that the MoS2 coated on the surface of TiO2 nanosheets with (001) facets (T-001). Further investigation of UV–Vis diffuse reflectance spectra revealed that light absorption had the strongest visible light range after T-001 compounded with MoS2. The photocatalytic activity of the composites were estimated by the photocatalytic degradation of methylene blue (MB) under visible light irradiation. Compared with T-001, The MT-001 exhibited better photocatalytic activity in MB degradation because of the formation of nano-heterojunction, which originated from intimate interfacial contacts as well as the suitably matching conduction and valance levels between MoS2 and T-001. When the MoS2 loading contents of MT-001 reached 5 wt% (5 wt% MT-001), the corresponding MB degradation rate was 83.26% under visible-light irradiation for 30 min; this value is approximately 1.44 times that of T-001. The possible visible-light photocatalytic mechanism was also proposed.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No. 21671026), Scientific Research Fund of Hunan Provincial Education Department (15C0117), Science and Technology Project of Changsha (K1407007-11) and Hunan Collaborative Innovation Center of Environmental and Energy Photocatalysis. The authors are also grateful to the aid provided by the Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province.

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Authors and Affiliations

  1. Department of Chemistry and Biological Engineering, Changsha University of Science and Technology, Changsha, 410114, China

    Chaocheng Li & Yi Zhou

  2. Hunan Province Key Laboratory of Applied Environmental Photocatalysis, Changsha University, Changsha, 410022, China

    Shiying Zhang & Jinbo Li

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  1. Chaocheng Li
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  2. Shiying Zhang
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  3. Yi Zhou
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  4. Jinbo Li
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Correspondence to Yi Zhou or Jinbo Li.

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Li, C., Zhang, S., Zhou, Y. et al. A situ hydrothermal synthesis of a two-dimensional MoS2/TiO2 heterostructure composite with exposed (001) facets and its visible-light photocatalytic activity. J Mater Sci: Mater Electron 28, 9003–9010 (2017). https://doi.org/10.1007/s10854-017-6631-1

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  • DOI: https://doi.org/10.1007/s10854-017-6631-1

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