Synthesis Of Different Structure Of Fe₃O₄/TiO₂/Graphene Ternary Composite And Study Of Their Photocatalytic Properties

Photocatalysis is a novel technology of high efficient, low cost, non-pollution, and some organic pollutants can be degraded by the photocatalytic materials under irradiation. TiO2as traditional photocatalytic material is applied to real life needs to solve some problems, such as the reuse and the recombination of electrons and holes of TiO2nanoparticles. In this paper, we have developed two kinds of different structure of Fe3O4, TiO2and graphene ternary composites to solve the recovery and low efficient problems of TiO2nanoparticles. The two kinds of structure of Fe3O4@TiO2/RGO (FTR) and Fe3O4/TiO2/Graphene (FTG) ternary nanocomposite were prepared successfully by a simple hydrothermal method in this experiment process. The morphology and structure of ternary composite were characterized by transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, scaning electron microscopy and X-ray photoelectron spectroscopy. The magnetism of FTR and FTG composite were operated through a vibrating sample magnetometer. It was shown that FTR ternary composite was the core-shell Fe3O4@TiO2nanoprticles were supported on the surface of reduced graphene oxide (RGO), and the saturation magnetization of FTR ternary composite was8.9emu·g-1. However, the FTG ternary composite was that the Fe3O4and TiO2nanoparticles were scattered on the graphene, and the saturation magnetization of FTG ternary composite was32.3emu·g-1. At last, using500w mercury lamp as the light source, the contaminants degradation efficiency in methyl orange as target pollutants was investigated the photocatalytic activity of the two kinds structure of FTR and FTG ternary composite. The results suggested that the photodegradation of FTG was higher that FTR ternary composite, the photocatalytic efficient of FTG was not changed after5times the light degradation experiment, and the FTG composite material was easier to recycle under magnetic field. Therefore, the FTG ternary composite was better structure than the FTR ternary composite.