中文摘要：

利用简单的共沉淀法在室温条件下制备了磁性空心蜂窝状的BiOI/Fe_3O_4光催化剂,采用X射线衍射（XRD）、透射电子显微镜（TEM）、扫描电子显微镜（SEM）、紫外-可见光漫反射谱仪（UV-vis）、N_2吸附-解析BET技术和振动磁强计（VSM）等仪器对其进行表征,并在可见光下催化降解双酚S（BPS）。结果表明,催化剂量为1.0 g·L-1、pH为9.0时,对BPS的去除率最高,可见光照90 min,BiOI/Fe_3O_4复合光催化剂对BPS的去除率可达90.6%。反应结束后,复合光催化剂在外加磁场作用下从反应体系中分离,循环实验5次后,其光催化效率仍保持在85.0%以上,表现出良好的稳定性。降解过程主要包含羟基自由基和光生空穴的氧化作用。沉淀法制备Bi OI/Fe_3O_4简单可靠,条件可控,所制备的Bi OI/Fe_3O_4具有良好的应用前景。

英文摘要：

A magnetic BiOI / Fe_3O_4 photocatalyst with a hollow honeycomb structure was prepared at room temperature by a facile coprecipitation method. The sample was characterized using a number of techniques including X-ray powder diffraction,scanning electron microscopy,transmission electron microscopy,ultravioletvisible diffuse reflection spectroscopy,the Brunauer-Emmett-Teller method,and vibrating sample magnetometry.The composite photocatalyst was used for bisphenol S（ BPS） degradation under irradiation with visible light. Results showed that BiOI / Fe_3O_4 exhibited the highest photocatalytic performance for BPS degradation when the catalyst dosage was 1. 0 g·L-1and the solution pH was 9. 0,with 90. 6% of BPS removed under visible light irradiation. After reaction,the composite photocatalyst could be easily separated from the reaction system using a magnetic field. After 5 cycles,the composite photocatalyst retained a high catalytic ability,with more than85. 0% BPS being removed. The photogenerated reactive species were determined based on free radical trapping experiments,which revealed that the photodegradation of BPS over BiOI / Fe_3O_4 under visible light was dominated by direct hole and hydroxyl radicals. This study provided a facile method for BiOI / Fe_3O_4 preparation,and the photocatalyst was promising for removal of BPS from aqueous solutions.