BiOX/TiO₂ (X = Cl, Br, and I) hierarchical composites with superior photoelectrochemical performances were successfully synthesized by one-pot low-temperature solvothermal process without any structure-directing agents. The dual functions of adsorption coupled with photocatalysis based on BiOX/TiO₂ were fully exhibited in terms of the quick degradation of colored and colorless organic pollutants (OPs). The as-prepared composites were characterized by field-emitting scanning electron microscope (FESEM), X-ray power diffraction (XRD) analysis, transmission electron microscope (TEM), N₂ adsorption/desorption, UV–vis diffuse reflectance spectra (DRS), photoluminescence spectra (PL), photocurrent measurements (PC), and electrochemical impedance spectroscopy (EIS), respectively. As-prepared BiOX/TiO₂ composites exhibited outstanding photoelectrochemical activities. Especially, the considerably enhanced adsorption and photocatalytic efficiencies were observed in the optimized BiOCl/TiO₂ composites compared to their counterparts. The improvement of adsorption and photocatalytic performances should be ascribed to the presence of columbite TiO₂-II in anatase, which would not only improve the ability of absorbing visible light and the charge separation efficiency, but also to effectively tailor the particle size, surface area and the exposed active facet of composites.

通过一锅式低温溶剂热法成功地合成了具有优异光电化学性能的BiOX / TiO ₂（X = Cl，Br和I）分层复合材料。在快速降解有色和无色有机污染物（OPs）方面，充分展现了基于BiOX / TiO ₂的吸附和光催化双重作用。通过场发射扫描电子显微镜（FESEM），X射线功率衍射（XRD）分析，透射电子显微镜（TEM），N ₂表征制备的复合材料。吸附/解吸，紫外可见漫反射光谱（DRS），光致发光光谱（PL），光电流测量（PC）和电化学阻抗谱（EIS）。制备的BiOX / TiO ₂复合材料表现出优异的光电化学活性。特别是，与相应的BiOCl / TiO ₂复合材料相比，在优化的BiOCl / TiO ₂复合材料中观察到了明显提高的吸附和光催化效率。吸附和光催化性能的提高应归因于存在钴胺矿TiO ₂-II在锐钛矿中，不仅可以提高吸收可见光的能力和电荷分离效率，而且可以有效地调整复合材料的粒径，表面积和暴露的活性面。