Cailiao gongcheng (Sep 2020)

Synthesis and visible light photocatalytic performance of CeO<sub>2</sub>-Ag/AgBr composite microspheres

  • LI Peng-peng,
  • SU Fu,
  • GU Zheng-gui

DOI
https://doi.org/10.11868/j.issn.1001-4381.2019.000935
Journal volume & issue
Vol. 48, no. 9
pp. 69 – 76

Abstract

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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 in-situ 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.

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