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Improved Photo-Carrier Transfer by an Internal Electric Field in BiOBr/Nrich C3N5 3D/2D S-Scheme Heterojunction for Efficiently Photocatalytic Micropollutant Removal

Changjun YouZhejiang Key Laboratory of Petrochemical Environmental Pollution Control, National Engineering Research Center for Marine Aquaculture, Key Laboratory of Health Risk Factors for Seafood of Zhejiang Province, Zhejiang Ocean University, Zhoushan 316022, Zhejiang Province, ChinaChunchun WangZhejiang Key Laboratory of Petrochemical Environmental Pollution Control, National Engineering Research Center for Marine Aquaculture, Key Laboratory of Health Risk Factors for Seafood of Zhejiang Province, Zhejiang Ocean University, Zhoushan 316022, Zhejiang Province, ChinaMingjie CaiCollege of Environmental Science and Engineering, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, ChinaYan LiuZhejiang Key Laboratory of Petrochemical Environmental Pollution Control, National Engineering Research Center for Marine Aquaculture, Key Laboratory of Health Risk Factors for Seafood of Zhejiang Province, Zhejiang Ocean University, Zhoushan 316022, Zhejiang Province, ChinaBaikang ZhuZhejiang Key Laboratory of Petrochemical Environmental Pollution Control, National Engineering Research Center for Marine Aquaculture, Key Laboratory of Health Risk Factors for Seafood of Zhejiang Province, Zhejiang Ocean University, Zhoushan 316022, Zhejiang Province, ChinaShijie LiZhejiang Key Laboratory of Petrochemical Environmental Pollution Control, National Engineering Research Center for Marine Aquaculture, Key Laboratory of Health Risk Factors for Seafood of Zhejiang Province, Zhejiang Ocean University, Zhoushan 316022, Zhejiang Province, China

2024en

ABI

Annotatsiya

Photocatalytic wastewater decontamination techniques hold eminent promise in mitigating environmental deterioration, yet the lack of distinctive photocatalysts prevents their further large-scale application. Herein, an S-scheme heterojunction photocatalyst BiOBr/C 3 N 5 (BBN) was fabricated for efficiently dislodging micropollutants under visible light. Among the BBN samples, the optimal BBN-2 demonstrated exceptional activity in photocatalytic TC removal with a rate constant of 0.0139 min ‒1 , which surpassed that of pure BiOBr and C 3 N 5 by 0.6 and 2.8 times, respectively. The spatially segregated photoredox sites and efficient photo-carrier separation propelled by an internal electric field are found to play a cardinal role in promoting photoreaction kinetics. Moreover, BBN-2 exhibited remarkable resistance to environmental interference and stability, retaining a high activity level after five runs. Through active radical detection, •O 2 ‒ , h + and •OH were identified as the primary active species in the photocatalytic reaction process. This research would encourage the exploration of C 3 N 5 -based photocatalysts for environmental protection. The well-designed BiOBr/N-rich C 3 N 5 3D/2D S-scheme heterojunction system enables efficient eradication of micropollutants in water under visible light, far bypassing pristine BiOBr and C 3 N 5 , respectively. This enhancement of photoactivity mainly originates from the simultaneous promotion of the generation and separation of photo-carriers induced by the optimization of optical response and establishment of an intense internal electric field.

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Identifikatorlar

DOI: 10.3866/pku.whxb202407014

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