Optimizing the charge distribution of photocatalysts through halide ion doping has been recognized as an effective approach to enhance photocatalytic activity. Herein, the bromine doped rose-like BiOCO microspheres were prepared through a one-step hydrothermal process. The visible diffuse reflectance spectroscopy (DRS) revealed that the bromine doping led to a narrowed band gap of BiOCO and optimized band structure. In addition, bromine doping can achieve efficient separation of photogenerated electron-hole pairs. Thus, the photodegradation efficiency of the antibiotic oxytetracycline (OTC) and the dye rhodamine B (RhB) were significantly improved over bromine doped rose-like BiOCO microspheres, which is 63.5% for OTC and 97.5% for RhB under visible light irradiation. The kinetic constants of the Br-BiOCO-2 material are 27.3 times for OTC and 156.2 times for RhB compared with those of pristine BiOCO. The enhanced photocatalytic performance can be attributed to the optimized carrier separation ability and broadened range of light response. The possible intermediates were identified by mass spectrometry (MS), and the degradation pathways were determined. A gradual decrease in toxicity during degradation was found by the Toxicity Estimation Software Tool (T.E.S.T). This work provides a new idea to construct high-performance photocatalysts for organic pollutants degradation.

中文翻译：

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合理构建溴掺杂玫瑰状 Bi2O2CO3 微球以增强可见光驱动降解

通过卤化物离子掺杂优化光催化剂的电荷分布已被认为是增强光催化活性的有效方法。本文通过一步水热法制备了溴掺杂玫瑰状 BiOCO 微球。可见漫反射光谱（DRS）表明，溴掺杂导致 BiOCO 的带隙变窄并优化了能带结构。此外，溴掺杂可以实现光生电子-空穴对的有效分离。因此，在可见光照射下，抗生素土霉素（OTC）和染料罗丹明B（RhB）的光降解效率比掺溴玫瑰状BiOCO微球显着提高，OTC为63.5%，RhB为97.5%。与原始BiOCO相比，Br-BiOCO-2材料的动力学常数为OTC的27.3倍和RhB的156.2倍。增强的光催化性能可归因于优化的载流子分离能力和拓宽的光响应范围。通过质谱（MS）鉴定了可能的中间体，并确定了降解途径。毒性估计软件工具（TEST）发现降解过程中毒性逐渐降低。该工作为构建高性能光催化剂降解有机污染物提供了新思路。