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The 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 H 2 O 2 presents a promising approach for pollutant removal; however, the processes of H 2 O 2 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 H 2 O 2 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 O 2 reduction for H 2 O 2 production. Moreover, the ultrathin BiOI provides abundant active sites for H 2 O 2 adsorption, promoting in situ H 2 O 2 activation for •O 2 - 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 H 2 O 2 production and activation, paving the way toward sustainable environmental remediation using solar energy.

Titel:	2D/2D Heterojunction of BiOBr/BiOI Nanosheets for In Situ H <subscript>2</subscript> O <subscript>2</subscript> Production and Activation toward Efficient Photocatalytic Wastewater Treatment.
Autor/in / Beteiligte Person:	Low, BQL ; Jiang, W ; Yang, J ; Zhang, M ; Wu, X ; Zhu, H ; Heng, JZX ; Tang, KY ; Wu, WY ; Cao, X ; Koh, XQ ; Chai, CHT ; Chan, CY ; Zhu, Q ; Bosman, M ; Zhang, YW ; Zhao, M ; Li, Z ; Loh, XJ ; Xiong, Y ; Ye, E
Zeitschrift:	Small methods, Jg. 8 (2024-03-01), Heft 3, S. e2301368
Veröffentlichung:	Weinheim : WILEY-VCH Verlag GmbH & Co. KGaA, [2017]-, 2024
Medientyp:	academicJournal
ISSN:	2366-9608 (electronic)
DOI:	10.1002/smtd.202301368
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2D/2D Heterojunction of BiOBr/BiOI Nanosheets for In Situ H <subscript>2</subscript> O <subscript>2</subscript> Production and Activation toward Efficient Photocatalytic Wastewater Treatment.