Citation: Tingting Huang, Yuhan Li, Xiaofeng Wu, Kangle Lv, Qin Li, Mei Li, Dongyun Du, Hengpeng Ye. In-situ transformation of Bi₂WO₆ to highly photoreactive Bi₂WO₆@Bi₂S₃ nanoplate via ion exchange[J]. Chinese Journal of Catalysis, ;2018, 39(4): 718-727. doi: 10.1016/S1872-2067(17)62913-9 shu

In-situ transformation of Bi₂WO₆ to highly photoreactive Bi₂WO₆@Bi₂S₃ nanoplate via ion exchange

Tingting Huang ^a, ,
Yuhan Li ^a,b ,
Xiaofeng Wu ^a ,
Kangle Lv ^a ,
Qin Li ^a ,
Mei Li ^a ,
Dongyun Du ^a ,
Hengpeng Ye ^a

a Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission & Ministry of Education, Hubei Province, College of Resources and Environmental Science, South-Central University for Nationalities, Wuhan 430074, Hubei, China;
b Department of Science and Environmental Studies, The Education University of Hong Kong, Tai Po, N. T., Hong Kong, China

Received Date: 22 October 2017
Revised Date: 26 November 2017

Fund Project: This work was supported by the National Natural Science Foundation of China (51672312, 21571192, 21373275), the Science and Technology Program of Wuhan (2016010101010018, 2015070504020220), the Key Project in the National Science & Technology Pillar Program during the Twelfth Five-Year Plan Period (2015BAB01B01), and the Natural Science Foundation of South-Central University for Nationalities (XTZ15016, CZP17062).

As a two dimensional (2D) visible-light-responsive semiconductor photocatalyst, the photoreactivity of Bi₂WO₆ is not high enough for practical application owing to its limited response to visible light and rapid recombination of photogenerated electron-hole pairs. In this paper, 2D core-shell structured Bi₂WO₆@Bi₂S₃ nanoplates were prepared by calcination of a mixture of Bi₂WO₆ (1.3 g) and a certain amount of Na₂S·9H₂O (0-3.0 g) at 350℃ for 2 h. The reactivity of the resulting photocatalyst materials was evaluated by photocatalytic degradation of Brilliant Red X-3B (X3B), an anionic dye, under visible light irradiation (λ > 420 nm). As the amount of Na₂S·9H₂O was increased from 0 to 1.5 g, the degradation rate constant of X3B sharply increased from 0.40×10^-3 to 6.6×10^-3 min^-1. The enhanced photocatalytic activity of Bi₂WO₆@Bi₂S₃ was attributed to the photosensitization of Bi₂S₃, which greatly extended the light-responsive range from the visible to the NIR, and the formation of a heterojunction, which retarded the recombination rate of photogenerated electron-hole pairs. However, further increases in the amount of Na₂S·9H₂O (from 1.5 to 3.0 g) resulted in a decrease of the photocatalytic activity of the Bi₂WO₆@Bi₂S₃ nanoplates owing to the formation of a photo-inactive NaBiS₂ layer covering the Bi₂WO₆ surface.
- Bi₂S₃,
- Bi₂WO₆,
- Ion exchange,
- Photocatalytic degradation,
- Nanoplate
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In-situ transformation of Bi2WO6 to highly photoreactive Bi2WO6@Bi2S3 nanoplate via ion exchange

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In-situ transformation of Bi₂WO₆ to highly photoreactive Bi₂WO₆@Bi₂S₃ nanoplate via ion exchange