Since the photocatalytic effect of a single conventional photocatalyst is often not ideal, it is particularly important to design and construct an efficient and stable photocatalyst in a compound way. In this study, we exploited the sol–gel method to combine BiOCl and TiO2 and gave full play to their respective advantages to prepare BiOCl/TiO2 composite materials. Then, X-ray diffraction (XRD), scanning electron microscope (SEM), and transmission electron microscope (TEM) characterization techniques were utilized to study important indicators of composites—composition, morphology, and structure. In the photodegradation experiment of methyl orange (MO), it was found that the photocatalytic performance of 10BTO (the molar ratio of TiO2 to BiOCl is 10:1) was the best among all the composite photocatalysts, and almost complete degradation of MO was realized. Besides, repeated experiments and recyclability tests on composite materials display favorable stability. Through ultraviolet–visible diffuse reflectance spectroscopy (UV–Vis DRS), photoluminescence (PL), transient photocurrent response, electrochemical impedance spectroscopy (EIS), and electron spin resonance (ESR), a possible degradation mechanism is proposed. Given that there are serious environmental pollution problems in our country, we sincerely hope this research will do its best to degrade organic pollutants in wastewater.

由于单一常规光催化剂的光催化效果通常不理想，因此以复合方式设计和构建高效稳定的光催化剂尤为重要。在这项研究中，我们利用溶胶-凝胶法将BiOCl和TiO 2结合起来，并充分发挥了它们各自的优势来制备BiOCl / TiO 2复合材料。然后，利用X射线衍射（XRD），扫描电子显微镜（SEM）和透射电子显微镜（TEM）表征技术研究了复合材料的重要指标-组成，形态和结构。在甲基橙（MO）的光降解实验中，发现10BTO的光催化性能（TiO 2的摩尔比）在所有复合光催化剂中，BiOCl的摩尔比为10：1）是最好的，并且可以实现MO的几乎完全降解。此外，复合材料的重复实验和可回收性测试显示出良好的稳定性。通过紫外可见漫反射光谱（UV-Vis DRS），光致发光（PL），瞬态光电流响应，电化学阻抗谱（EIS）和电子自旋共振（ESR），提出了一种可能的降解机理。鉴于我国存在严重的环境污染问题，我们衷心希望本研究能尽最大的努力降解废水中的有机污染物。