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Area of Science:

  • Materials Science
  • Environmental Chemistry
  • Nanotechnology

Background:

  • Defect and heteroatom doping are crucial for optimizing photocatalyst performance.
  • Combining these strategies offers a powerful approach for designing advanced photocatalysts.

Purpose of the Study:

  • To synthesize dual defect-engineered BiVO4 nanosheets (BVO-N-OV) via N doping and oxygen vacancies.
  • To investigate the synergistic effects of these defects on photocatalytic activity.
  • To evaluate the performance of BVO-N-OV in degrading ciprofloxacin (CIP) using peroxymonosulfate (PMS) under visible light.

Main Methods:

  • Ammonium oxalate-assisted thermal treatment of BiVO4 nanosheets to introduce N doping and oxygen vacancies.
  • Characterization of material properties, including band structure and surface active sites.
  • Photocatalytic degradation experiments using the BVO-N-OV/PMS system under visible light illumination.

Main Results:

  • The BVO-N-OV nanosheets exhibited enhanced visible light absorption, charge transfer efficiency, and increased active sites.
  • The BVO-N-OV/PMS system showed significantly improved CIP removal rates, with rate constants 7.9, 1.9, and 6.6 times higher than pristine BiVO4, BVO-OV, and BVO-N, respectively.
  • The system demonstrated stable and excellent performance across a wide pH range (3.0-11.0) and in the presence of various anions.

Conclusions:

  • The synergistic effect of N doping and oxygen vacancies in BiVO4 significantly enhances its photocatalytic activity for CIP degradation.
  • The developed BVO-N-OV/PMS system is a highly efficient and stable solution for visible-light-driven wastewater treatment.
  • This study provides valuable insights into defect and doping engineering for designing advanced photocatalyst/PMS systems.