Ma Lili, Liu Shuan, Xu Jieyu, Zhao Ni, Li Shijie, Jiang Wanxi, Pan Zhicheng, Yang Bing, Liu Yucheng, Lai Bo
College of Chemistry and Chemical Engineering, Institute of Industrial Hazardous Waste Disposal and Utilization, Southwest Petroleum University, Chengdu, 610500, China; Sichuan Engineering Technology Research Center for High Salt Wastewater Treatment and Resource Utilization, Sichuan University of Science and Engineering, Zigong, 643000, China; National Postdoctoral Research Station, Haitian Water Group Co., Ltd., Chengdu, 610213, China.
College of Chemistry and Chemical Engineering, Institute of Industrial Hazardous Waste Disposal and Utilization, Southwest Petroleum University, Chengdu, 610500, China.
J Environ Manage. 2025 Sep;391:126674. doi: 10.1016/j.jenvman.2025.126674. Epub 2025 Jul 20.
The novel Z-scheme heterojunction BiO/TiO photocatalytic system with oxygen-rich vacancies was constructed in this paper, which realized the efficient degradation of tetracycline. The tetracycline was 92.2 % removed by BiO/TiO after 60 min of visible-light driving, which is not only attributed to the high density of oxygen vacancies (0.3676 a.u.), but also depends on the synergistic integration of oxygen vacancies with Z-scheme heterojunctions. It is shown that the electron transfer energy from the oxygen vacancy-induced intermediate energy level in BiO/TiO to the BiO valence band is significantly lower than that from the TiO conduction band, which contributes to the establishment of the Z-scheme charge transfer mechanism. Meanwhile, the intermediate energy level in the system can trap and stabilize the photogenerated electrons, thus reducing the electron-hole complexation rate. Combined with chromatography-mass spectrometry, density functional theory and toxicity assessment studies, the series of tetracycline degradation intermediates and their corresponding transformation pathways in the BiO/TiO photocatalytic system were revealed, confirming that this technology can reduce the risk of the global ecological spread of tetracycline antibiotics. This study provides a new design paradigm for oxygen vacancy engineering to modulate Z-scheme heterojunction, which shows application prospects in the field of treatment of antibiotic pollution in wastewater.
本文构建了具有富氧空位的新型Z型异质结BiO/TiO光催化体系，实现了四环素的高效降解。在可见光驱动60分钟后，BiO/TiO对四环素的去除率达到92.2%，这不仅归因于高浓度的氧空位（0.3676 a.u.），还取决于氧空位与Z型异质结的协同整合。结果表明，BiO/TiO中由氧空位诱导的中间能级向BiO价带的电子转移能量显著低于从TiO导带的电子转移能量，这有助于建立Z型电荷转移机制。同时；体系中的中间能级可以捕获并稳定光生电子，从而降低电子-空穴复合率。结合色谱-质谱、密度泛函理论和毒性评估研究，揭示了BiO/TiO光催化体系中四环素降解的一系列中间产物及其相应的转化途径，证实了该技术可以降低四环素抗生素在全球生态环境中扩散的风险。本研究为氧空位工程调控Z型异质结提供了一种新的设计范式，在废水抗生素污染治理领域具有应用前景。
