Improved Photo-Carrier Transfer by an Internal Electric Field in BiOBr/N-rich C3N5 3D/2D S-Scheme Heterojunction for Efficiently Photocatalytic Micropollutant Removal
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/C3N5(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 C3N5 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,·O2–,h+and·OH were identified as the primary active species in the photocatalytic reaction process.This research would encourage the exploration of C3N5-based photocatalysts for environmental protection.
C3N5S-scheme heterojunctionMicropollutant removalInternal electric fieldPhotocatalysis
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