Efficient Photocatalytic Degradation of Tetracycline by S‐Type Heterojunction BiOBr/h‐MoO3 With Oxygen‐Rich Vacancies Under Visible Light

Yi Ren, Jiaxuan Yang, Hongxia Li, Xiaohui Niu, Xiaoyu Liu, Li Chen, Haiyan Fan, Kunjie Wang

2025

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DOI 10.1002/aoc.70356
Data confidence 85 high
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Abstract

ABSTRACT A BiOBr/h‐MoO3 heterostructure photocatalyst with oxygen vacancy (OV) modulation was synthesized via solvothermal in situ precipitation, exhibiting enhanced visible‐light‐driven tetracycline (TC) degradation performance. The composite demonstrated 1.5‐ and 4‐fold higher TC degradation rates compared to pristine BiOBr and h‐MoO3, respectively. Structural characterization via XRD, XPS, and FTIR confirmed the successful synthesis of the composite with controlled OV concentration and interfacial bonding characteristics. Photoluminescence (PL) and electron spin resonance (ESR) analyses revealed that the BiOBr/h‐MoO3 heterojunction achieved optimal reactive oxygen species (ROS) production and minimized electron–hole recombination. Under optimized conditions (catalyst dosage: 10 mg L−1, TC concentration: 10 mg L−1, pH 10), the system attained 84% TC degradation within 60 min while maintaining 80% efficiency after five operational cycles. Mechanistic studies identified hydroxyl radicals (OH) and photogenerated holes (h+) as dominant active species, with OVs critically enhancing interfacial charge transfer efficiency. This work provides a viable strategy for constructing OV‐engineered heterojunction photocatalysts for antibiotic wastewater treatment.