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

doi:10.1016/S1872-2067(17)62913-9

Abstract

Abstract:

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.

Key words: Bi₂S₃, Bi₂WO₆, Ion exchange, Photocatalytic degradation, Nanoplate

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.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(17)62913-9

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

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