γ-Fe_2O_3/BiOI光催化材料的制备及其性能研究

Preparation and propertie of γ-Fe_2O_3/BiOI photocatalytic material

利用水热法合成了新型磁性γ-Fe_2O_3/BiOI纳米复合材料,并用X射线衍射(XRD)、扫描电子显微镜(SEM)、紫外可见漫反射(UV-Vis DRS)、能谱元素分析(EDS)、磁性表征(VSM)对其结构进行表征。通过在可见光下降解亚甲基蓝(MB),对其光催化性能进行评价,结果表明,5%γ-Fe_2O_3/BiOI磁性复合材料的光催化活性较好,60 min对MB的降解率达到97%。可在外加磁场的作用下实现快速分离与回收。光催化剂的回收循环实验表明,3次循环利用后对MB的光催化降解率仅小幅下降,说明其具有很好的重复稳定性。

Novel magnetic γ-Fe2O3/BiOI nanocomposites with visible light response are successfully fabricated and characterized by X-ray diffraction（ XRD）,scanning electron microscopy（ SEM）,UV-Vis diffuse reflectance（ UV-Vis DRS）,energy dispersive elemental analysis（ EDS） and magnetic characterization（ VSM）,respectively. The photocatalytic activities of the γ-Fe2O3/BiOI products are evaluated via the photodegradation of methylene blue（ MB）solution under visible-light radiation. The results show that better photocatalytic activity can be achieved by using 5% ofγ-Fe2O3/BiOI magnetic composites as catalyst. The degradation rate reaches 97% after degradation for 60 min.Moreover,rapid separation and recovery of the γ-Fe2O3/BiOI magnetic composites can be facilitated under the external magnetic field. The photocatalytic degradation rate of MB is only slightly decreased after 3 cycles,indicating good repeatability.