Enhanced visible light absorption of Bi2WO6/SiO2 with abundant adsorbed oxygen for the degradation of organic pollutant--颗粒学报PARTICUOLOGY

Wu, Y., Wang, X., Zhong, W., & Zhang, S. (2024). Enhanced visible light absorption of Bi2WO6/SiO2 with abundant adsorbed oxygen for the degradation of organic pollutant. Particuology, 88, 210-217. https://doi.org/10.1016/j.partic.2023.09.008

Enhanced visible light absorption of Bi₂WO₆/SiO₂ with abundant adsorbed oxygen for the degradation of organic pollutant

Yuanting Wu ^*, Xiaoying Wang, Wenlong Zhong, Shan Zhang

School of Material Science and Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China

10.1016/j.partic.2023.09.008

Volume 88, May 2024, Pages 210-217

Received 29 June 2023, Revised 31 August 2023, Accepted 7 September 2023, Available online 30 September 2023, Version of Record 7 November 2023.

E-mail: wuyuanting@sust.edu.cn

Highlights

• Generation of Si–O–W bonds speed up the nanocrystallization of Bi₂WO₆.

• Loads of surface adsorbed oxygen generates during nanocrystallization of Bi₂WO₆.

• The surface adsorbed oxygen promotes separation of charge carriers.

• O₂− is main active substances in photocatalytic reaction.

• Composite catalyst exhibits an enhancement of 2.5 times than Bi₂WO₆.

Abstract

Heterogeneous photocatalysts exhibit high catalytic efficiency in the degradation of pollutants, but their stability and repeatability is not very good and requires high structural matching. Simply by nanosizing the pure Bi₂WO₆ (BWO) photocatalyst without constructing a heterojunction, there is a significant improvement in its performance, with an enhancement effect of about 2.3 times (99.43%). The high photocatalytic degradation efficiency of the material can be attributed to the enhanced light absorption effect brought by the three-dimensional inverse-opal structure SiO₂ (IS) and the abundant surface adsorbed oxygen generated after the formation of Si–O–W bonds. In addition, the introduction of IS greatly increases the surface area of nanostructured BWO, which accelerates the charge transfer process, while the adsorbed oxygen promotes the participation of ·O₂− in the photocatalytic reaction, thereby accelerating the consumption of photo-generated electrons and ultimately improving the separation of charge carriers. Furthermore, the matched photonic bandgap further improves the absorption and utilization of light of the material. In this work, we constructs Si–O–W bonds to obtain inverse-opal SiO₂/Bi₂WO₆ with uniformly growth of pure phase nano BWO, which provides a feasible strategy for the preparation of high-performance pure-phase photocatalysts.

Graphical abstract

Keywords

Bi₂WO₆; SiO₂ inverse-opal structure; Photocatalysis; Adsorbed oxygen

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