Synthesis and visible light photocatalytic performance of CeO₂-Ag/AgBr composite microspheres

• Main Authors: LI Peng-peng, SU Fu, GU Zheng-gui
• Format: Article
• Language: zho
• Published: Journal of Materials Engineering 2020-09-01
• Series: Journal of Materials Engineering
• Subjects: ceo₂; agbr; z-scheme heterojunction; photocatalytic activity
• Online Access: http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2019.000935
• ISSN: 1001-4381; 1001-4381

CeO₂ mesoporous microspheres were synthesized by hydrothermal method and loaded with AgBr nanoparticles(NPs)on their surface. A small amount of Ag nanoparticles were obtained by <i>in-situ</i> reduction by photo deposition method to prepare CeO₂-Ag/AgBr heterostructure catalyst. CeO₂-Ag/AgBr samples were characterized by scanning electron microscopy (SEM), ultraviolet diffuse reflection (DRS), transmission electron microscopy (TEM), fluorescence spectroscopy (PL) and X-ray photoelectron spectroscopy(XPS).The photocatalytic performance of CeO₂-Ag/AgBr(CAAB) was investigated with Rhodamine B(RhB) as the target degradation material and xenon lamp (500 W). The results show that the photocatalytic activity of CAAB-3 (36.03%AgBr) is the highest. When the concentration of CAAB-3 is 5 mg/L, the degradation rate of RhB reaches 94.84% within 80 min, which is 22.3 times of the degradation capacity of CeO₂. After multiple cycles of experiments, the degradation rate of CAAB-3 remains stable at 88.55%. The plasma on resonance effect of Ag NPs reduces the recombination of electron holes and photogenic carriers and enhances the photocatalytic performance.