It is necessary to construct photocatalytic heterojunctions with high efficiency to remove bacteria and antibiotics from polluted water. To achieve this goal, by selecting Bi₄O₅I₂ with narrow band gap and BiOCl with wide band gap, a novel Bi₄O₅I₂/BiOCl heterojunction was constructed by a simple precipitation method. Various characterizations including XRD, TEM and XPS confirmed that the Bi₄O₅I₂/BiOCl heterojunction was successfully synthesized. The optimum sample 30% Bi₄O₅I₂/BiOCl can inactivate Escherichia coli (E. coli) in 30 min, Staphylococcus aureus (S. aureus) in 75 min and degrade 76% tetracycline (TC) in 60 min in LED light. To further study the performance of the photocatalyst, the photocatalyst was tested in sunlight. It was found 30% Bi₄O₅I₂/BiOCl could inactivate E. coli in 6 min, S. aureus in 15 min and degrade 84% TC in 60 min under sunlight, realizing a shorter reaction time and a better degradation efficiency. Photocurrent and electrochemical impedance tests (EIS) results confirmed higher electron hole separation efficiency in composites. The mechanism of removing pollutants under LED light and sunlight was verified by their respective capture experiments. This experiment provides a new possibility for the application of photocatalysts in a variety of light sources.

有必要构建高效的光催化异质结以去除污水中的细菌和抗生素。为了实现这一目标，通过选择带隙较窄的Bi ₄ O ₅ I ₂和带隙较宽的BiOCl，通过简单的沉淀法构建了新型Bi ₄ O ₅ I ₂ /BiOCl 异质结。包括XRD、TEM 和XPS 在内的各种表征证实成功合成了Bi ₄ O ₅ I ₂ /BiOCl 异质结。最佳样品30% Bi ₄ O ₅ I ₂ /BiOCl 可以灭活大肠杆菌（大肠杆菌）在 30 分钟内降解，金黄色葡萄球菌（金黄色葡萄球菌）在 75 分钟内降解，在 LED 灯下 60 分钟内降解 76% 的四环素 (TC)。为了进一步研究光催化剂的性能，在阳光下测试了光催化剂。发现 30% Bi ₄ O ₅ I ₂ /BiOCl 可在 6 分钟内灭活大肠杆菌，金黄色葡萄球菌15 分钟内降解 84% TC，在阳光下 60 分钟内降解 84% TC，实现更短的反应时间和更好的降解效率。光电流和电化学阻抗测试 (EIS) 结果证实复合材料中的电子空穴分离效率更高。通过各自的捕获实验验证了在LED光和阳光下去除污染物的机制。该实验为光催化剂在多种光源中的应用提供了新的可能性。