Enhanced visible light photocatalytic degradation of oxytetracycline hydrochloride using heterojunction BiOBr/TiO2 composites

IF 6.9 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Applied Surface Science Pub Date : 2025-06-30 DOI:10.1016/j.apsusc.2025.163945

Caixia Deng , Shuang Li , JiaYu Wang , Yingying Li , Jian Chen , Fenglin Tang , Xiupei Yang

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引用次数: 0

Abstract

Type II heterojunction photocatalysts were fabricated by compositing BiOBr with TiO₂, with samples labeled BiOBr/TiO₂-1 to BiOBr/TiO₂-5 (the number denotes the mass of TiO₂ in mg used during synthesis). Among these, BiOBr/TiO₂-2 (containing 100 mg TiO₂) exhibited optimal visible-light photocatalytic performance for oxytetracycline hydrochloride (OTC) degradation, achieving 94.38 % removal within 60 min. High-resolution transmission electron microscopy (HRTEM) confirmed successful composite formation through the observation of dual lattice spacings (0.28 nm for BiOBr (1 1 0) and 0.35 nm for TiO₂). This composite displayed a superior degradation rate constant of 0.04757 min⁻¹, exceeding those of pristine BiOBr and TiO₂ by factors of 2 and 14, respectively. The enhanced activity was attributed to effective charge separation enabled by the Type II heterojunction structure. Radical trapping experiments combined with electron paramagnetic resonance (EPR) analysis identified photogenerated holes (h⁺) and superoxide radicals (•O₂⁻) as the dominant reactive species. HPLC–MS analysis revealed degradation intermediates, and toxicity assessment predicted progressive detoxification during the process. This study demonstrated that BiOBr/TiO₂-2 is a stable and efficient photocatalyst with significant potential for antibiotic wastewater treatment.

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异质结BiOBr/TiO2复合材料增强可见光催化降解盐酸土霉素

将BiOBr与TiO2复合制备II型异质结光催化剂，样品标记为BiOBr/TiO2-1至BiOBr/TiO2-5（数字表示合成过程中使用的TiO2质量，单位为mg）。其中，BiOBr/TiO2-2（含100 mg TiO2）对盐酸土霉素（OTC）的可见光催化降解性能最佳，在60 min内达到94.38% %的去除率。高分辨率透射电镜（HRTEM）通过观察双晶格间距（BiOBr（110）为0.28 nm， TiO2为0.35 nm）证实了复合材料的成功形成。该复合材料的降解速率常数为0.04757 min−1，分别是原始BiOBr和TiO2的2倍和14倍。活性的增强归因于II型异质结结构的有效电荷分离。自由基捕获实验结合电子顺磁共振（EPR）分析发现光生空穴（h+）和超氧自由基（•O2−）是主要的活性物质。HPLC-MS分析揭示了降解中间体，毒性评估预测了过程中的逐步解毒。本研究表明，BiOBr/TiO2-2是一种稳定高效的光催化剂，在抗生素废水处理中具有重要的潜力

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来源期刊

Applied Surface Science 工程技术-材料科学：膜

CiteScore

12.50

自引率

7.50%

发文量

3393

审稿时长

67 days

期刊介绍： Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.