通过水热法制备磁性Fe3O4@C纳米微球,分别将TiO2和ZnO负载到微球上得到磁性Fe3O4@TiO2/ZnO催化剂。利用扫描电镜、红外光谱和紫外漫反射光谱表征催化剂的形貌和结构性能。紫外漫反射光谱显示磁性Fe3O4@TiO2/ZnO的吸收带边红移,表明催化剂可以在更高的波长范围内吸收光波,且禁带宽度变大表明光生电子和空穴具有更强的氧化还原能力,因此具有更强的光催化活性。相比于磁性Fe3O4@TiO2,磁性Fe3O4@TiO2/ZnO催化剂对罗丹明B的降解率从65.33%增加到98.11%。循环使用5次后,磁性Fe3O4@TiO2/ZnO催化剂对罗丹明B的降解率仍保持92.05%,说明该催化剂具有易于回收和良好的循环稳定性。

Magnetic Fe3O4@TiO2/ZnO catalysts were fabricated by loaded TiO2 and ZnO to magnetic Fe3O4@C nanoparticle fabricated by hydrothermal method. The morphology and structure of catalysts were characterized by scanning electron microscopy, infrared spectroscopy and UV-diffused reflectance spectrum. The diffused reflectance spectrum shows that the absorption edge of magnetic Fe3O4@TiO2/ZnO catalysts are red shifted, indicate that the catalysts absorb lights in the higher wavelength. And the increasing of energy gap, indicate that the hole-electron pairs have stronger redox capacity, and therefore they could more eficiently utilize lights for the photocatalytic purpose. The degradation of (Rhodamine B, RhB) for Fe3O4@TiO2/ZnO catalysts increase from 65.33% to 98.11% compared to magnetic Fe3O4@TiO2. The degradation of RhB for magnetic Fe3O4@TiO2/ZnO catalysts are still 92.05% after recycling 5 times. This indicates Fe3O4@TiO2/ZnO catalysts are easy to recycle and have good recycling stability.