2D/2D Heterojunction of BiOBr/BiOI Nanosheets for In Situ H2O2 Production and Activation toward Efficient Photocatalytic Wastewater Treatment

2D/2D Heterojunction of BiOBr/BiOI Nanosheets for In Situ H2O2 Production and Activation toward Efficient Photocatalytic Wastewater Treatment

Small Methods

10.1002/smtd.202301368

http://dx.doi.org/10.1002/smtd.202301368

Beverly Qian Ling Low, Wenbin Jiang, Jing Yang, Mingsheng Zhang, Xiao Wu, Hui Zhu, Houjuan Zhu, Jerry Zhi Xiong Heng, Karen Yuanting Tang, Wen‐Ya Wu, Xun Cao, Xue Qi Koh, Casandra Hui Teng Chai, Chui Yu Chan, Qiang Zhu, Michel Bosman, Yong‐Wei Zhang, Ming Zhao, Zibiao Li, Xian Jun Loh, Yujie Xiong, Enyi Ye

27 November 2023

Low, B. Q. L., Jiang, W., Yang, J., Zhang, M., Wu, X., Zhu, H., Zhu, H., Heng, J. Z. X., Tang, K. Y., Wu, W., Cao, X., Koh, X. Q., Chai, C. H. T., Chan, C. Y., Zhu, Q., Bosman, M., Zhang, Y., Zhao, M., Li, Z., … Ye, E. (2023). 2D/2D Heterojunction of BiOBr/BiOI Nanosheets for In Situ H2O2 Production and Activation toward Efficient Photocatalytic Wastewater Treatment. Small Methods, 8(3). Portico. https://doi.org/10.1002/smtd.202301368

AbstractThe presence of toxic organic pollutants in aquatic environments poses significant threats to human health and global ecosystems. Photocatalysis that enables in situ production and activation of H2O2 presents a promising approach for pollutant removal; however, the processes of H2O2 production and activation potentially compete for active sites and charge carriers on the photocatalyst surface, leading to limited catalytic performance. Herein, a hierarchical 2D/2D heterojunction nanosphere composed of ultrathin BiOBr and BiOI nanosheets (BiOBr/BiOI) is developed by a one‐pot microwave‐assisted synthesis to achieve in situ H2O2 production and activation for efficient photocatalytic wastewater treatment. Various experimental and characterization results reveal that the BiOBr/BiOI heterojunction facilitates efficient electron transfer from BiOBr to BiOI, enabling the one‐step two‐electron O2 reduction for H2O2 production. Moreover, the ultrathin BiOI provides abundant active sites for H2O2 adsorption, promoting in situ H2O2 activation for •O2− generation. As a result, the BiOBr/BiOI hybrid exhibits excellent activity for pollutant degradation with an apparent rate constant of 0.141 min−1, which is 3.8 and 47.3 times that of pristine BiOBr and BiOI, respectively. This work expands the range of the materials suitable for in situ H2O2 production and activation, paving the way toward sustainable environmental remediation using solar energy.

Publisher Copyright

This research / project is supported by the National Research Foundation - Competitive Research Programme
Grant Reference no. : NRF-CRP24-2020-0002

This research / project is supported by the A*STAR - Italy-Singapore Science and Technology Cooperation
Grant Reference no. : R23101R040

This research / project is supported by the A*STAR - Central Research Fund
Grant Reference no. : NA

This is the peer reviewed version of the following article: Low, B. Q. L., Jiang, W., Yang, J., Zhang, M., Wu, X., Zhu, H., Zhu, H., Heng, J. Z. X., Tang, K. Y., Wu, W., Cao, X., Koh, X. Q., Chai, C. H. T., Chan, C. Y., Zhu, Q., Bosman, M., Zhang, Y., Zhao, M., Li, Z., … Ye, E. (2023). 2D/2D Heterojunction of BiOBr/BiOI Nanosheets for In Situ H2O2 Production and Activation toward Efficient Photocatalytic Wastewater Treatment. Small Methods, 8(3). Portico. https://doi.org/10.1002/smtd.202301368 , which has been published in final form at doi.org/10.1002/smtd.202301368. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.

https://oar.a-star.edu.sg/communities-collections/articles/16288

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