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Comparative study on the synthesis and photocatalytic performance of Bi2WO6 nanosheets prepared via molten salt and hydrothermal method

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Abstract

In this study, Bi2WO6 nanosheets were synthesized via molten salt (M-Bi2WO6) and hydrothermal method (H-Bi2WO6), respectively. Powder X-ray diffraction and scanning electron microscopy measurements demonstrated that the as-prepared Bi2WO6 samples preferred orientated alone {001} plane in both hydrothermal and molten salt system, enabling the formation of Bi2WO6 nanosheets. The results of UV–vis diffuse reflection spectrum showed that the M-Bi2WO6 nanosheets exhibited an obvious red shift in visible light absorption band in comparison with H-Bi2WO6 nanosheets, and the band gap of M-Bi2WO6 and H-Bi2WO6 nanosheets was 2.49 and 2.62 eV, respectively. As a result, the M-Bi2WO6 nanosheets reached as high as 97.13% of photodegradation efficiency of Rhodamine B under 180 min of sunlight irradiation, which was two times higher than that of the H-Bi2WO6 nanosheets (86.88%). Meanwhile, the photodegradation rate over M-Bi2WO6 (97.30%) for TC degradation was about two times higher than that of H-Bi2WO6 (78.58%). The much-enhanced photocatalytic performance of M-Bi2WO6 nanosheets was attributed to the better crystallinity, higher light-harvesting capability and superior sorption capacity. Basing on the detailed experimental study and analysis, this work could be a practical guidance for the fabrication of Bi2WO6-based microstructures with enhanced photocatalytic efficiency.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No. 21571162), the Guangdong Province Enterprise-University-Academy Collaborative Project (No. 2012B091100474).

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Authors and Affiliations

  1. Engineering Research Center of Nano-Geomaterials of Ministry of Education, China University of Geosciences, Wuhan, 430074, China

    Gui Yang, Yujun Liang, Kai Li, Jian Yang, Yingli Zhu, Shiqi Liu & Rui Xu

  2. Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan, 430074, China

    Gui Yang, Yujun Liang, Kai Li, Jian Yang, Yingli Zhu, Shiqi Liu & Rui Xu

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  1. Gui Yang
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  2. Yujun Liang
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Correspondence to Yujun Liang.

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Yang, G., Liang, Y., Li, K. et al. Comparative study on the synthesis and photocatalytic performance of Bi2WO6 nanosheets prepared via molten salt and hydrothermal method. J Mater Sci: Mater Electron 29, 14311–14321 (2018). https://doi.org/10.1007/s10854-018-9565-3

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  • DOI: https://doi.org/10.1007/s10854-018-9565-3

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