Citation: Zhongliao Wang, Taiping Hu, Kai Dai, Jinfeng Zhang, Changhao Liang. Construction of Z-scheme Ag₃PO₄/Bi₂WO₆ composite with excellent visible-light photodegradation activity for removal of organic contaminants[J]. Chinese Journal of Catalysis, ;2017, 38(12): 2021-2029. doi: 10.1016/S1872-2067(17)62942-5 shu

Construction of Z-scheme Ag₃PO₄/Bi₂WO₆ composite with excellent visible-light photodegradation activity for removal of organic contaminants

a College of Physics and Electronic Information, Anhui Key Laboratory of Energetic Materials, Huaibei Normal University, Huaibei 235000, Anhui, China;
b Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, Anhui, China

Received Date: 19 September 2017
Revised Date: 12 October 2017

Fund Project: This work was supported by the National Natural Science Foundation of China (51572103, 51502106) and the Foundation for Young Talents in College of Anhui Province (gxyqZD201751).

Ag₃PO₄ has good potential for use in photocatalytic degradation of organic contaminants. However, the activity and stability of Ag₃PO₄ is hard to sustain because of photocorrosion and the positive potential of the conduction band of Ag₃PO₄. In this study, A composite consisting of Bi₂WO₆ nanosheets and Ag₃PO₄ was developed to curb recombination of charge carriers and enhance the activity and stability of the catalyst. Formation of a Ag₃PO₄/Bi₂WO₆ composite was confirmed using X-ray diffraction, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. Photoluminescence spectroscopy provided convincing evidence that compositing Bi₂WO₆ with Ag₃PO₄ effectively reduced photocorrosion of Ag₃PO₄. The Ag₃PO₄/Bi₂WO₆ composite gave a high photocatalytic performance in photodegradation of methylene blue. A degradation rate of 0.61 min^-1 was achieved; this is 1.3 and 6.0 times higher than those achieved using Ag₃PO₄ (0.47 min^-1) and Bi₂WO₆ (0.10 min^-1), respectively. Reactive species trapping experiments using the Ag₃PO₄/Bi₂WO₆ composite showed that holes, ·OH, and ·O₂^-all played specific roles in the photodegradation process. The photocatalytic mechanism was investigated and a Z-scheme was proposed as a plausible mechanism.
- Ag₃PO₄,
- Bi₂WO₆,
- Photocatalysis,
- Z-scheme,
- Degradation,
- Visible light
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Construction of Z-scheme Ag₃PO₄/Bi₂WO₆ composite with excellent visible-light photodegradation activity for removal of organic contaminants