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<p>In this study, bismuth ferrite (BiFeO<sub>3</sub>, BFO) catalysts doped with different contents of peanut shell biochar (BC) were prepared and used in the removal of antibiotic-resistant bacteria (ARB) by peroxymonosulfate (PMS) activation from wastewater. The PMS (0.03 mM)/5% BC-BFO (0.5 g L<sup>−1</sup>) system removed 1.92 log ARB within 10&#xa0;min of reaction at a reaction rate of 0.4401&#xa0;min<sup>−1</sup>. Raman spectra analysis revealed that 5% BC-BFO exhibited more defects and oxygen vacancies (Ov), which provided active sites for PMS activation to generate SO<sub>4</sub><sup>⋅−</sup>, O<sub>2</sub><sup>⋅−</sup>, and <sup>1</sup>O₂, thereby promoting ARB inactivation. The oxidation of PMSO to PMSO₂ suggests that high-valent iron-oxo species may also be involved in the inactivation of ARB. The PMS/5% BC-BFO system caused oxidative damage to the ARB cell membrane, increasing its permeability from 4.34% to 46.00%. Simultaneously, it triggered the activation of bacterial self-defense mechanisms and a cascade reaction, leading to the upregulation of intracellular reactive oxygen species (ROS) levels (rising from 6.34% to 62.90%), ultimately resulting in ARB inactivation. In addition, the ARB removal under PMS activation by the fourth recycled 5% BC-BFO catalyst was 62.6% of that by the fresh 5% BC-BFO. In summary, this study proposes a low-cost and easily synthesized novel catalyst for the efficient ARB removal from wastewater.</p> Graphical Abstract <p></p>

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Peroxymonosulfate activation by peanut shell biochar-doped BiFeO3 composite to remove antibiotic resistant bacteria from aquaculture wastewater

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月2日

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  • Fengru Lu,
  • Yingxin Chen,
  • Jinlian Huang,
  • Jingui Lin,
  • Yanqiong Zhang,
  • Lijie Xu,
  • Lu Gan,
  • Muting Yan,
  • Han Gong

摘要

In this study, bismuth ferrite (BiFeO3, BFO) catalysts doped with different contents of peanut shell biochar (BC) were prepared and used in the removal of antibiotic-resistant bacteria (ARB) by peroxymonosulfate (PMS) activation from wastewater. The PMS (0.03 mM)/5% BC-BFO (0.5 g L−1) system removed 1.92 log ARB within 10 min of reaction at a reaction rate of 0.4401 min−1. Raman spectra analysis revealed that 5% BC-BFO exhibited more defects and oxygen vacancies (Ov), which provided active sites for PMS activation to generate SO4⋅−, O2⋅−, and 1O₂, thereby promoting ARB inactivation. The oxidation of PMSO to PMSO₂ suggests that high-valent iron-oxo species may also be involved in the inactivation of ARB. The PMS/5% BC-BFO system caused oxidative damage to the ARB cell membrane, increasing its permeability from 4.34% to 46.00%. Simultaneously, it triggered the activation of bacterial self-defense mechanisms and a cascade reaction, leading to the upregulation of intracellular reactive oxygen species (ROS) levels (rising from 6.34% to 62.90%), ultimately resulting in ARB inactivation. In addition, the ARB removal under PMS activation by the fourth recycled 5% BC-BFO catalyst was 62.6% of that by the fresh 5% BC-BFO. In summary, this study proposes a low-cost and easily synthesized novel catalyst for the efficient ARB removal from wastewater.

Graphical Abstract