引入内建电场强化BiOBr/C3N5 S型异质结中光载流子分离以实现高效催化降解微污染物
Improved Photo-Carrier Transfer by an Internal Electric Field in BiOBr/N-rich C3N5 3D/2D S-Scheme Heterojunction for Efficiently Photocatalytic Micropollutant Removal
游常俊 1王春春 1蔡铭洁 2刘艳萍 1竺柏康 1李世杰1
作者信息
- 1. 浙江海洋大学,浙江省石油化工环境污染控制重点实验室,国家海洋设施养殖工程技术研究中心,浙江省海产品健康危害因素关键技术研究重点实验室,浙江 舟山 316022
- 2. 同济大学环境科学与工程学院,上海 200092
- 折叠
摘要
光催化技术在废水处理及环境治理领域展现出巨大的应用潜力,而开发高效的光催化剂则是实现这一技术广泛应用的关键.在本研究中,我们成功地设计并制备了一种新型S型BiOBr/C3N5(BBN)异质结光催化剂用于在可见光下高效去除微污染物.系统评估了BBN材料在可见光下对四环素(TC)和萘(NAP)的光催化降解效果.结果表明,BBN-2样品表现出最佳的光催化活性,其反应速率常数为0.0139 min−1,比纯BiOBr和C3N5分别提高了0.6倍和2.8倍,这主要得益于BBN异质结具有空间分隔开的氧化还原位点以及利用内建电场作为驱动力,促进光生载流子的有效分离,从而加速微污染物的降解反应.此外,BBN-2具有卓越的抗外界环境干扰特性以及优异的稳定性能,在经过五次循环使用后,仍能保持较高的光催化活性.通过自由基活性检测实验,我们确认了超氧阴离子自由基(·O2–)、空穴(h+)和羟基自由基(·OH)是参与光催化反应过程的主要活性物种.本研究为开发高效C3N5基催化体系用于环境治理开辟了一种新的思路.
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/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.
关键词
C3N5/S型异质结/微污染物去除/内建电场/光催化Key words
C3N5/S-scheme heterojunction/Micropollutant removal/Internal electric field/Photocatalysis引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据