以Bi（NO₃）₃·5H₂O、NH₄VO₃和Ce（NO₃）₃·6H₂O为原料，Fe₃O₄为磁基质，通过水热-超声辅助原位法合成了Ce-BiVO₄/Fe₃O₄复合光催化剂，利用XRD、UV-Vis-DRS、FT-IR等对催化剂进行了结构表征；以亚甲基蓝（MB）为目标降解物，利用单因素变量法考察了催化剂反应条件对光催化性能的影响。结果表明，催化剂中BiVO₄以单斜晶相和四方晶相混合存在，稀土Ce的掺杂拓宽了BiVO₄的光谱响应范围并增强了其可见光吸收能力，在Ce-BiVO₄/Fe₃O₄催化剂的质量浓度为1.5 g/L、反应体系pH=7和可见光下反应90 min的条件下，对25 mg/L的MB降解率达97.3%。该催化剂重复使用3次后，对MB的降解率仍可达80%以上；该催化剂对其他3种染料也表现出良好的降解能力。

A novel Ce-BiVO₄/Fe₃O₄ composite photocatalyst is synthesized by hydrothermal-ultrasonic-assisted in situ method with Bi(NO₃)₃·5H₂O,NH₄VO₃ and Ce(NO₃)₃·6H₂O as raw materials,and Fe₃O₄ as magnetic matrix.The catalyst is characterized by XRD,UV-Vis-DRS and FTIR techniques.Taking methylene blue (MB) as the target pollutant for degradation,the effect of reaction conditions on photocatalytic performance of the catalyst is investigated through single factor variable method.The experimental results show that BiVO₄ in the composite catalyst exists as a mixture with monoclinic phase and tetragonal phase.The doping of rare earth Ce broadens the spectral response range of BiVO₄ and enhances its visible light absorption capability.The degradation rate of 25 mg·L^-1 MB can reach 97.3% under 90 min of visible light irradiation when the dosage of Ce-BiVO₄/Fe₃O₄ catalyst is 1.5 g·L^-1 and pH value of the solution is 7.The degradation rate of MB can still exceed 80% over the catalyst that has been used for three times.This catalyst also shows good degradation ability to the other three kinds of dyes.

邹平(1997-),本科,研究方向为染料废水处理,2916124553@qq.com