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Fabrication of novel p-Ag2O/n-PbBiO2Br heterojunction photocatalysts with enhanced photocatalytic performance under visible-light irradiation

  • Zuming HeEmail author
  • Jiangbin SuEmail author
  • Rui Chen
  • Bin Tang
Article
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Abstract

The p-Ag2O/n-PbBiO2Br heterojunctions were prepared by the polyacrylamide gel synthesis and chemical deposition method. The as-synthesized Ag2O/PbBiO2Br photocatalysts were characterized in details by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field-emission scanning electron microscope (FE-SEM), energy-dispersive X-ray spectroscopy (EDX), transmission electron microscope (TEM), electron spin resonance (ESR), ultraviolet-visible diffuse reflectance spectroscopy (UV–Vis DRS) and electrochemical workstation. Compared with the pure PbBiO2Br and Ag2O, the Ag2O/PbBiO2Br photocatalysts exhibit enhanced photocatalytic activities for the degradation of methylene blue (MB) under visible-light irradiation. In particular, the Ag2O/PbBiO2Br(1:1) composite shows the optimal photocatalytic performance. The degradation efficiency of MB reaches 99.2% in 50 min, and the best reaction rate constant reaches 5.982 × 10−2 min−1, which is 7.6 and 10.2 times higher than that of pure Ag2O and PbBiO2Br, respectively. The significantly enhanced photocatalytic performance of Ag2O/PbBiO2Br photocatalysts could be attributed to the broadened light absorption and the formation of the p–n heterojunctions between Ag2O and PbBiO2Br. Consequently the photo-generated electron–hole pairs can be separated effectively. Through the ESR technique and the radical trapping experiments, the superoxide (\(\cdot {\text{O}}_{2}^{-}\)) radicals and holes are demonstrated to play the major role in the MB degradation. Finally, based on the experimental results and analyses, the photocatalytic mechanism of the Ag2O/PbBiO2Br composites was proposed.

Notes

Funding

This work was supported by the Natural Science Foundation of Jiangsu Province (BK20181043) and the Specialized Research Fund for the Doctoral Program of Jiangsu University of Technology (KYY17011)

Compliance with ethical standards

Conflict of interest

The authors declare that they have no competing interests.

Supplementary material

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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Huaide SchoolChangzhou UniversityJingjiangChina
  2. 2.School of Mathematics & PhysicsChangzhou UniversityChangzhouChina

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