Insights into nitrogen-doped BiOBr with oxygen vacancy and carbon quantum dots photocatalysts for the degradation of sulfonamide antibiotics: Actions to promote exciton dissociation and carrier migration

离解(化学) 光催化 光致发光 量子点 载流子 兴奋剂 电子顺磁共振 氧气 光化学 激子 化学 猝灭(荧光) 材料科学 化学物理 纳米技术 荧光 物理化学 光电子学 有机化学 催化作用 凝聚态物理 物理 核磁共振 量子力学
作者
Zhenchao Li,Chenghui Wen,Daguang Li,Fang Zheng,Zili Lin,Dezhu Liu,Yishun Wang,Xiaoyu Zhang,Ping Chen,Wenying Lv,Guoguang Liu
出处
期刊:Chemical Engineering Journal [Elsevier]
卷期号:492: 152449-152449 被引量:5
标识
DOI:10.1016/j.cej.2024.152449
摘要

The strong excitonic effect significantly influences the efficiency of electron-hole pair generation. Therefore, promoting the dissociation of excitons into free charge carriers has drawn much attention. In this study, nitrogen (N)-doped BiOBr photocatalyst (BOBNC) modified with carbon quantum dots (CQDs) was synthesized via a solvothermal method. We demonstrated through photoluminescence and photoelectrochemical techniques the synergistic effect of oxygen vacancies and CQDs, facilitating exciton dissociation and charge carrier migration, consequently significantly enhancing the electron density in the material. Compared to pure BiOBr, degradation experiments revealed that the optimized doping ratio of 0.5BOBNC with CQDs increased the rate constant for sulfamethoxazole (SIZ) by 19.89 times. Furthermore, based on quenching experiments, electron spin resonance (ESR) tests, and DFT calculations, h+, O2•− and 1O2 were identified as the primary reactive species for SIZ degradation, and a photocatalytic mechanism was proposed. Additionally, the influence of various environmental factors on the photocatalytic system was investigated. In conclusion, this work not only contributes to a profound understanding of BiOBr exciton dissociation but also presents a promising photocatalytic technique for the remediation of diverse water environments.
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