Preparation of g-C3N4/CeO2/BiOBr composite and its photocatalytic degradation property for RhB under visible light

Porous layered g-C3N4 was selected as base material via direct calcination method to synthesize g-C3N4/CeO2/BiOBr ternary composite photocatalytic materials with heterogeneous structure, while CeO2/BiOBr composites were introduced by ultrasonic stirring method. The composition, structure and optical properties of g-C3N4/CeO2/BiOBr were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, UV-Vis DRS and photoluminescence analysis, and so on. The results show that the g-C3N4/CeO2/BiOBr has sandwich layered stacking structure, good interface contact structure and excellent light response performance due to the uniform phase distribution and high degree of crystallization. When the molar fraction of Ce : Bi is 1 : 1 and the mass fraction of g-C3N4 is 15%, the obtained three-phase composite shows the highest photocatalytic degradation property for RhB. The degradation rate for RhB is 99%, which is 86 times that of pure CeO2 and 3 times that of pure BiOBr. In addition, the composite has good stability with the RhB degradation efficiency of 89% after four cycles