Citation: Yongchuan Wu, Zhongmin liu, Yaru Li, Jitao Chen, Xixi Zhu, Ping Na. Construction of 2D-2D TiO₂ nanosheet/layered WS₂ heterojunctions with enhanced visible-light-responsive photocatalytic activity[J]. Chinese Journal of Catalysis, ;2019, 40(1): 60-69. doi: 10.1016/S1872-2067(18)63170-5 shu

Construction of 2D-2D TiO₂ nanosheet/layered WS₂ heterojunctions with enhanced visible-light-responsive photocatalytic activity

Yongchuan Wu ^a, ,
Zhongmin liu ^b ,
Yaru Li ^a ,
Jitao Chen ^a ,
Xixi Zhu ^c ,
Ping Na ^a

a School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China;
b College of Chemistry and Chemical Engineering, Dezhou University, Dezhou 253023, Shandong, China;
c College of Chemistry and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China

Received Date: 21 July 2018
Revised Date: 21 September 2018

Fund Project: This work was supported by the National High Technology Research and Development Program of China (863 Program, 2012AA063504), the National Natural Science Foundation of China (U1407116, 21511130020, 21276193), and the Tianjin Municipal Natural Science Foundation (13JCZDJC35600).

Constructing nanocomposites that combine the advantages of composite materials, nanomaterials, and interfaces has been regarded as an important strategy to improve the photocatalytic activity of TiO₂. In this study, 2D-2D TiO₂ nanosheet/layered WS₂ (TNS/WS₂) heterojunctions were prepared via a hydrothermal method. The structure and morphology of the photocatalysts were systematically characterized. Layered WS₂ (~4 layers) was wrapped on the surface of TiO₂ nanosheets with a plate-to-plate stacked structure and connected with each other by W=O bonds. The as-prepared TNS/WS₂ heterojunctions showed higher photocatalytic activity for the degradation of RhB under visible-light irradiation, than pristine TiO₂ nanosheets and layered WS₂. The improvement of photocatalytic activity was primarily attributed to enhanced charge separation efficiency, which originated from the perfect 2D-2D nanointerfaces and intimate interfacial contacts between TiO₂ nanosheets and layered WS₂. Based on experimental results, a double-transfer photocatalytic mechanism for the TNS/WS₂ heterojunctions was proposed and discussed. This work provides new insights for synthesizing highly efficient and environmentally stable photocatalysts by engineering the surface heterojunctions.
- WS₂,
- TiO₂,
- Nanosheet,
- Heterojunction,
- Photocatalysis,
- Visible-light responsive
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Construction of 2D-2D TiO2 nanosheet/layered WS2 heterojunctions with enhanced visible-light-responsive photocatalytic activity

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Construction of 2D-2D TiO₂ nanosheet/layered WS₂ heterojunctions with enhanced visible-light-responsive photocatalytic activity