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<p>Due to its high efficiency, safety, and low economic cost, peroxymonosulfate (PMS) advanced oxidation processes (AOPs) are widely used for removing organic pollutants from wastewater. In this study, a green porous biochar made from waste wood powder, derived from building materials, was used as the carrier matrix. Iron-magnesium oxides with high catalytic activity and stability were loaded as active centers, and molybdenum ions were added to create a ternary composite catalyst (Fe/Mg@BC-Mo). The addition of molybdenum improves the interaction between the metal and the carrier, reduces metal ion aggregation, accelerates the reduction and regeneration of Fe³⁺, and enhances catalytic efficiency. In the Fe/Mg@BC-Mo/PMS system, tetracycline hydrochloride (TCH) is degraded and removed through the catalyst’s adsorption and the synergistic effect of free radical and non-free radical pathways. The optimal conditions are a PMS concentration of 5 mM, a catalyst dose of 0.5&#xa0;g/L, and a reaction time of 2&#xa0;min, achieving a TCH removal rate of 98.22%. The catalytic system exhibits good pH tolerance and high recyclability. Notably, within a pH range of 3–10, the degradation rate remains above 93.76%. After nine reuse cycles, the TCH degradation rate remains at 87.38%. This method tackles the problem of low catalyst recyclability while enabling quick and efficient removal of organic pollutants, thereby lowering production costs and process duration. The free radical quenching experiment and electron paramagnetic resonance (EPR) analysis explain the degradation mechanism, highlighting the roles of free radicals and non-free radical pathways, with ·OH and ¹O₂ playing key roles in the reaction.</p> Graphical Abstract

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Biochar-Supported Fe/Mg Co-doped MoS2 Synergistically Enhances PMS Activation for the Degradation of Tetracycline Hydrochloride: A Study on the Fe2+/Fe3+ Cycling Driving Mechanism and Catalytic Stability

  • 期刊论文

  • 发表日期：

    2026年1月3日

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  • Haifeng Li,
  • Yu Yao,
  • Peixuan Li,
  • Xiqian Guo,
  • Yan Zhang,
  • Jifen Wang,
  • Yi Zhang

摘要

Due to its high efficiency, safety, and low economic cost, peroxymonosulfate (PMS) advanced oxidation processes (AOPs) are widely used for removing organic pollutants from wastewater. In this study, a green porous biochar made from waste wood powder, derived from building materials, was used as the carrier matrix. Iron-magnesium oxides with high catalytic activity and stability were loaded as active centers, and molybdenum ions were added to create a ternary composite catalyst (Fe/Mg@BC-Mo). The addition of molybdenum improves the interaction between the metal and the carrier, reduces metal ion aggregation, accelerates the reduction and regeneration of Fe³⁺, and enhances catalytic efficiency. In the Fe/Mg@BC-Mo/PMS system, tetracycline hydrochloride (TCH) is degraded and removed through the catalyst’s adsorption and the synergistic effect of free radical and non-free radical pathways. The optimal conditions are a PMS concentration of 5 mM, a catalyst dose of 0.5 g/L, and a reaction time of 2 min, achieving a TCH removal rate of 98.22%. The catalytic system exhibits good pH tolerance and high recyclability. Notably, within a pH range of 3–10, the degradation rate remains above 93.76%. After nine reuse cycles, the TCH degradation rate remains at 87.38%. This method tackles the problem of low catalyst recyclability while enabling quick and efficient removal of organic pollutants, thereby lowering production costs and process duration. The free radical quenching experiment and electron paramagnetic resonance (EPR) analysis explain the degradation mechanism, highlighting the roles of free radicals and non-free radical pathways, with ·OH and ¹O₂ playing key roles in the reaction.

Graphical Abstract