Improved Photo-Carrier Transfer by an Internal Electric Field in BiOBr/Nrich C3N5 3D/2D S-Scheme Heterojunction for Efficiently Photocatalytic Micropollutant Removal
Changjun You, Chunchun Wang, Mingjie Cai, Yan Liu, Baikang Zhu, Shijie Li
Abstract
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. Download: Download high-res image (91KB) Download: Download full-size image