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首先通过共沉淀法制备Fe3O4磁粒子,然后采用水热法制备Fe3O4/Bi2O3复合粒子,并利用X-射线衍射、X-光电子能谱、扫描电子显微镜等进行表征。结果表明,复合粒子由Fe3O4和Bi2O3组成,形貌呈球形,具有三维多级结构。在可见光照射下,所制备的复合粒子对罗丹明B的降解率达95.2%。降解完成后,在外界磁场的作用下,Fe3O4/Bi2O3很快从体系中分离,可进行重复利用,实现循环催化。实验发现,Fe3O4/Bi2O3经5次循环催化后,对罗丹明B的降解率仍达93%以上。
Firstly, Fe3O4 magnetic particles were prepared by coprecipitation, and then Fe3O4 / Bi2O3 composite particles were prepared by hydrothermal method and characterized by X-ray diffraction, X-ray photoelectron spectroscopy and scanning electron microscopy. The results show that the composite particles consist of Fe3O4 and Bi2O3 with spherical morphology and three-dimensional multi-level structure. Under visible light irradiation, the degradation rate of rhodamine B was 95.2%. After the degradation is completed, under the action of the external magnetic field, the Fe3O4 / Bi2O3 is quickly separated from the system and can be reused for recycling. It was found that the degradation rate of Rhodamine B reached more than 93% after Fe3O4 / Bi2O3 was catalyzed by 5 cycles.