Mechanism insight into the Fe3O4/biochar/BiOBr S–scheme heterostructure with improved photocatalytic degradation performance for pharmaceutical wastewater

IF 5.4 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects Pub Date : 2025-09-30 DOI:10.1016/j.colsurfa.2025.138518

Zihao Niu , Chao Chen , Zihan Yin , Xiaofei Zhang , Jing Sun , Huanxian Shi

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引用次数: 0

Abstract

Rapid recombination of photogenerated carriers is significant barrier to the photodegradation of organic contaminants in pharmaceutical wastewater. This study utilized BiOBr nanosheets as modifiers to improve the separation efficiency of photogenerated carriers and enhance the self–cleaning capability of magnetic biochar (Fe₃O₄/biochar). The photocatalytic performance of the novel system (Fe₃O₄/biochar/BiOBr) was evaluated by degrading tetracycline (TC) under visible light irradiation, achieving approximately 88.17 % degradation within 20 min. The intermediates and potential degradation pathways were thoroughly analyzed using liquid chromatography–mass spectrometry. The photocatalytic degradation mechanism and the enhancement of degradation activity were investigated using various techniques and DFT calculations. Electron spin resonance (ESR) measurements and trapping experiments identified ·OH, ¹O₂, ·O₂⁻, and h⁺ as the primary reactive species involved. The photogenerated charge transfer across the FCB heterojunction interface followed the S–scheme mechanism, as confirmed by optoelectronic experiments and density functional theory (DFT) calculations. This research introduces a novel approach to utilizing biochar–supported photocatalysts for pharmaceutical wastewater treatment.

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Fe3O4/生物炭/BiOBr s -方案异质结构对制药废水光催化降解性能的机理研究

光生成载体的快速重组是光降解制药废水中有机污染物的重要障碍。本研究利用BiOBr纳米片作为改性剂，提高了光生载体的分离效率，增强了磁性生物炭（Fe3O4/生物炭）的自清洁能力。通过在可见光照射下降解四环素（TC）来评价新体系（Fe3O4/生物炭/BiOBr）的光催化性能，在20 min内实现了约88.17 %的降解。采用液相色谱-质谱联用技术对中间体和潜在的降解途径进行了全面分析。利用各种技术和DFT计算研究了光催化降解机理和降解活性的增强。电子自旋共振（ESR）测量和捕获实验确定了·OH， 1O2，·O2−和h+是主要的反应物质。光电子实验和密度泛函理论（DFT）计算证实了FCB异质结界面的光生电荷转移遵循S-scheme机制。介绍了一种利用生物炭负载光催化剂处理制药废水的新方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Colloids and Surfaces A: Physicochemical and Engineering Aspects 化学-物理化学

CiteScore

8.70

自引率

9.60%

发文量

2421

审稿时长

56 days

期刊介绍： Colloids and Surfaces A: Physicochemical and Engineering Aspects is an international journal devoted to the science underlying applications of colloids and interfacial phenomena. The journal aims at publishing high quality research papers featuring new materials or new insights into the role of colloid and interface science in (for example) food, energy, minerals processing, pharmaceuticals or the environment.