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Preparation of the all-solid-state Z-scheme WO3/Ag/AgCl film on glass accelerating the photodegradation of pollutants under visible light

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Abstract

Tungsten oxide (WO3) is a well-known photocatalyst, but its application is restricted due to its low conduction band and reduction power. In addition, WO3 catalyst in powder forms has little application prospect because of difficulties in separation and regeneration. In this work, we prepared WO3/Ag/AgCl films on conventional glass that not only have much enhanced photocatalytic capability but also can be readily regenerated. The WO3 film was prepared on glass substrate by calcination of spin-coated W precursor. Ag/AgCl particles were then deposited on WO3 film by an impregnating–precipitation–photoreduction method. The photocatalytic efficiency of WO3/Ag/AgCl was evaluated by using methyl orange (MO) and Rhodamine B (RhB) as target pollutants. The highest photocatalytic performance was achieved with the 3-WO3/Ag/AgCl film, being 18 and 13 times higher than that of pure WO3 film for degradation of MO and RhB, respectively. The degradation rate for both MO and RhB by 3-WO3/Ag/AgCl film catalyst decreased by less than 5% after five cycled tests. The photodegradation mechanism was discussed based on the electrochemical impedance spectroscopy Nyquist tests, photoelectrochemical analysis and reactive oxygen species scavenging experiments. A possible all-solid-state Z-scheme mechanism is proposed based on the photoelectron chemical tests and radical trapping experiments. This study provides a feasible technique to prepare a photocatalytic film with practicability and reproducibility.

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Acknowledgements

This work was financially supported by the Environmental Protection Scientific Research Project of Jiangsu Province (2016056), National Key R&D Program of China (2016YFB0302800), the Qing Lan Project, the Weapon Research Support Fund (No. 62201070827), a Project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), and Basic Product Innovation Technology Research Project of Explosives, the Weapon Research Support Fund (62201070804).

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Authors and Affiliations

  1. National Special Superfine Powder Engineering Center, Nanjing University of Science and Technology, Nanjing, 210094, China

    Hongbiao Fang, Xiang Lv, Nan Yang & Wei Jiang

  2. State Key Laboratory of Advanced Technology for Float Glass, Bengbu, 233000, China

    Xin Cao & Tianhe Wang

  3. Chemicobiology and Functional Materials Institute, Nanjing University of Science and Technology, Nanjing, 210094, China

    Jiajie Yu

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  1. Hongbiao Fang
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  2. Xin Cao
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  3. Jiajie Yu
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  4. Xiang Lv
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  5. Nan Yang
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  6. Tianhe Wang
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  7. Wei Jiang
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Correspondence to Tianhe Wang or Wei Jiang.

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Fang, H., Cao, X., Yu, J. et al. Preparation of the all-solid-state Z-scheme WO3/Ag/AgCl film on glass accelerating the photodegradation of pollutants under visible light. J Mater Sci 54, 286–301 (2019). https://doi.org/10.1007/s10853-018-2856-5

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