摘要:
采用水热法合成了磁性的、可见光响应的Fe3O4/BiOI复合光催化剂，运用X射线衍射(XRD)，扫描电子显微镜(SEM)，紫外–可见漫反射光谱(UV-vis DRS)对所制备的光催化剂进行了表征，结果显示所制备的复合光催化剂的粒径范围为0.5~2 μm且形貌呈球形结构。在可见光照射下，通过降解甲基橙测定不同比例复合光催化剂的活性大小，结果表明当Fe3O4的负载量为5%时，复合光催化剂具有最佳的光催化活性，甲基橙的降解率可达81%；而单纯的BiOI的降解率仅为40%。通过外部磁场的作用，Fe3O4/BiOI复合光催化剂能快速彻底地从体系中分离。复合光催化剂实现了外部磁场控制的循环回收利用，在实际应用中具有潜在的价值。
Abstract:
Magnetic Fe3O4/BiOI composite photocatalysts with visible light response were successfully fab-ricated through hydrothermal method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-visible diffuse reflection spectroscopy (UV-vis DRS) respectively. The characterization results show that the grain sizes of composite photocatalysts samples were varied from 0.5 μm to 2 μm and their morphologies were spheroid. The activities of composite photocatalysts with different proportions were evaluated by photodegradation of methyl orange under visible-light irradiation. Results show that the 5% Fe3O4/BiOI composite photocatalyst has the best photocatalytic activity. After 120 min of irradiation, removal rate of methyl orange reached to 81%, which was superior to the pure BiOI (40%). By the effect of the external magnetic field, the composite photocatalysts can be quickly and completely separated from the system, indicating a potential prospect in the practical application.