中文摘要：

采用γ-Fe2O3掺杂对BiOCl/BiVO4进行改性.通过超声-水热法合成出粒径在1.5～2.0 μm、表面附着BiOCl纳米片和球形颗粒γ-Fe2O3的BiVO4微米块状磁性γ-Fe2O3/BiOCl/BiVO4复合光催化剂.结合XRD、SEM、UV-Vis DRS等表征手段对复合材料的组成、形貌、光学性质进行表征,通过光催化降解若丹明B溶液对其光催化性能进行评价.结果表明,使用过的15％ γ-Fe2O3/BiOCl/BiVO4复合光催化剂可以通过外磁场作用很容易地与反应溶液分离,且仍具有较高的可见光催化活性和稳定性,其重复使用4次后,对若丹明B的降解率和光催化剂的回收率变化不明显,仍达到88.6％和90.3％.

英文摘要：

The magnetic γ-Fe2O3/BiOCl/BiVO4 composite photocatalyst was successfully synthesized by a simple uhrasound-hydrothermal method. The crystalline structures, morphologies and optical properties of the γ- Fe2O3/BiOCl/BiVO4 composite photocatalyst were characterized by X-ray powder diffraction, SEM and UV-Vis DRS. The as-prepared micron massive of BiVO4 with average diameters of 1.5 - 2.0 μm were constructed by BiOCl/BiVO4 nanosheets decorated by γ-Fe2O3 nanoparticles. The photocatalytic activities of γ-Fe2O3/BiOCl/BiVO4 were evaluated via the photodegradation of rhodamine B under visible-light radiation. The results showed that the 15% γ- Fe2O3/BiOCl/BiVO4 composite photocatalyst can be easily separated from the reaction solution by external magnetic field, and the composite photocatalyst has high visible light catalytic activity and stability, the degradation rate of rhodamine B and light catalyst recovery rate can still be reached to 88.6% and 90. 3% after used 4 times. It has potential applications in water treatment and environmental cleaning.