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<p>The S-scheme Bi<sub>2</sub>O<sub>3</sub>/MnS heterojunction is fabricated by loading Bi<sub>2</sub>O<sub>3</sub> onto the MnS surface by solvothermal method. The XRD detection demonstrates that the crystalline structure of MnS remains unaltered after loading Bi<sub>2</sub>O<sub>3</sub>. SEM and TEM tests revealed that Bi<sub>2</sub>O<sub>3</sub> is uniformly loaded on the MnS surface and tightly bound to it, forming an S-scheme heterojunction. The heterojunction both boosts the separation and transfer of carriers and preserves the powerful reducing property of MnS conduction band electrons and the strong oxidation property of Bi<sub>2</sub>O<sub>3</sub> valence band holes. The Bi<sub>2</sub>O<sub>3</sub>/MnS composite exhibits better degradation of ciprofloxacin (CIP) than individual MnS and Bi<sub>2</sub>O<sub>3</sub>, with the best photocatalytic activity at 5&#xa0;wt% Bi<sub>2</sub>O<sub>3</sub> loading amount. After 100&#xa0;min of visible light irradiation, the degradation rate of CIP can reach 91.3% with Bi<sub>2</sub>O<sub>3</sub>/MnS as catalyst. Additionally, after four cycles, Bi<sub>2</sub>O<sub>3</sub>/MnS can still degrade 87.1% of the CIP, demonstrating the stability of this composite catalyst.</p> Graphical Abstract <p></p>

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S-scheme Bi2O3/MnS heterojunction for photocatalytic degradation of ciprofloxacin under visible light

  • 期刊论文

  • 发表日期：

    2025年3月20日

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  • Guangling Zuo,
  • Ruyi Yang,
  • Guanli Luo,
  • Jia Du,
  • Xin Ding,
  • Hongyong Ye

摘要

The S-scheme Bi2O3/MnS heterojunction is fabricated by loading Bi2O3 onto the MnS surface by solvothermal method. The XRD detection demonstrates that the crystalline structure of MnS remains unaltered after loading Bi2O3. SEM and TEM tests revealed that Bi2O3 is uniformly loaded on the MnS surface and tightly bound to it, forming an S-scheme heterojunction. The heterojunction both boosts the separation and transfer of carriers and preserves the powerful reducing property of MnS conduction band electrons and the strong oxidation property of Bi2O3 valence band holes. The Bi2O3/MnS composite exhibits better degradation of ciprofloxacin (CIP) than individual MnS and Bi2O3, with the best photocatalytic activity at 5 wt% Bi2O3 loading amount. After 100 min of visible light irradiation, the degradation rate of CIP can reach 91.3% with Bi2O3/MnS as catalyst. Additionally, after four cycles, Bi2O3/MnS can still degrade 87.1% of the CIP, demonstrating the stability of this composite catalyst.

Graphical Abstract