Novel SrTiO₃/BiOI heterostructure photocatalysts were successfully fabricated through a facile chemical bath method with assistant of the ethylene glycol. The photocatalysts were applied to minimize methyl orange (MO), bisphenol A (BPA), antibiotic oxytetracycline hydrochloride (OTTCH) under visible light irradiation. The SrTiO₃/BiOI composites exhibited excellent photocatalytic performance towards the different refractory pollutants. Especially, the sample of STB-22.12 possessed the best photocatalytic performance in all the obtained catalysts. Several reaction parameters affecting degradation such as initial concentration, ion species were investigated systematically. Three-dimensional excitation–emission matrix fluorescence spectroscopy (3D EEMs) was used to further investigate the MO and OTTCH molecule degradation process. The photocatalytic mechanism over composite photocatalyst is systematically investigated by active species trapping experiments, ESR technique and Mott–Schottky measurements. Moreover, the energy band alignments of SrTiO₃/BiOI heterostructure were confirmed via combining DRS and XPS analysis, which provided strong support for the proposed mechanism. This work could provide a deeper insight for the heterojunction catalyst.

通过简便的化学浴法在乙二醇的辅助下成功制备了新型的SrTiO ₃ / BiOI异质结构光催化剂。施加光催化剂以在可见光照射下使甲基橙（MO），双酚A（BPA），抗生素土霉素盐酸盐（OTTCH）最小化。SrTiO ₃/ BiOI复合材料对不同的难熔污染物表现出优异的光催化性能。特别是，STB-22.12样品在所有获得的催化剂中均具有最佳的光催化性能。系统地研究了影响降解的几个反应参数，例如初始浓度，离子种类。三维激发-发射矩阵荧光光谱法（3D EEM）用于进一步研究MO和OTTCH分子的降解过程。通过活性物种捕获实验，ESR技术和Mott–Schottky测量系统地研究了复合光催化剂上的光催化机理。此外，SrTiO ₃的能带取向通过结合DRS和XPS分析确定了/ BiOI异质结构，这为所提出的机理提供了有力的支持。这项工作可以为异质结催化剂提供更深的见解。