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Designing visible-light-driven direct Z-scheme Ag2WO4/WS2 heterojunction to enhance photocatalytic activity

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Abstract

The direct Z-scheme Ag2WO4/WS2 photocatalysts had been fabricated by using a deposition method. Experimental results indicated that WS2 nanosheets could improve the photocatalytic activity, light absorption and recyclability of Ag2WO4 under the visible light irradiation. The degradation efficiency of the as-obtained Ag2WO4/WS2 hybrids for rhodamine B displayed first increasing and then decreasing with increasing the usage of WS2 nanosheets. When the usage of WS2 was 15 wt%, in 120 min, it reached the maximum of 97.8%, which was higher than 17.8% of pure Ag2WO4. Moreover, after three cycles of the degradation, the as-prepared hybrids still possessed 94.4% of the degradation efficiency, which increased by 1211.1% compared with pure Ag2WO4. Moreover, superoxide and hydroxyl radicals played major role during the process of photocatalytic degradation. The enhanced photocatalytic activity could be ascribed to the formation of direct Z-scheme photocatalytic system between Ag2WO4 and WS2.

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Acknowledgements

This work was supported by the Natural Science Foundation of Hebei Province, China (E2013210011 and B2016210111).

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  1. Xiang-Feng Wu and Hui Li made equally efforts to this work and share the first authorship.

Authors and Affiliations

  1. School of Materials Science and Engineering, Hebei Provincial Key Laboratory of Traffic Engineering Materials, Shijiazhuang Tiedao University, 17 Northeast, Second Inner Ring, Shijiazhuang, 050043, China

    Xiang-Feng Wu, Hui Li, Jun-Cheng Pan, Yi-Jin Wang, Chen-Xu Zhang, Jun-Zhang Su, Jia-Rui Zhang, Ying Zhang, Wei-Guang Zhang, Li-Song Sun & Xiu-Guo Sun

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Wu, XF., Li, H., Pan, JC. et al. Designing visible-light-driven direct Z-scheme Ag2WO4/WS2 heterojunction to enhance photocatalytic activity. J Mater Sci: Mater Electron 29, 14874–14882 (2018). https://doi.org/10.1007/s10854-018-9625-8

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