Biochar (BC) has been demonstrated the potential to activate persulfate (PS), but the limited catalytic efficiencies hindered their further application. Herein, an innovative magnetic MgFe₂O₄/BC (MMB) derived from pomelo peel was prepared for persulfate-based advanced oxidation process (PS-AOPs). Benefitting from the extraordinary properties, levofloxacin (LFX) was efficiently removed in the MMB/PS system. MMB700 exhibited the best catalytic activity, 87.87% of LFX was removed in the MMB700/PS system. In addition, it could maintain 67.90% of LFX degradation efficiency after 3 times of reuse. Quenching experiments, electron spin resonance (ESR) detection, and electrochemical test results indicated that both non-radical pathway and direct electron-transfer pathway advanced LFX degradation. LFX was oxidized by O₂^·− and ¹O₂, O₂^·− acted as the dominant active species. PS activation was induced by the active sites of MMB700. This work not only developed a promising magnetic biochar PS catalyst for antibiotics elimination, but also facilitated insights PS activation mechanisms.

生物炭 (BC) 已被证明具有活化过硫酸盐 (PS) 的潜力，但有限的催化效率阻碍了它们的进一步应用。在此，一种创新的磁性 MgFe ₂ O ₄来自柚皮的 /BC (MMB) 制备用于基于过硫酸盐的高级氧化工艺 (PS-AOPs)。得益于非凡的特性，左氧氟沙星 (LFX) 在 MMB/PS 系统中被有效去除。MMB700表现出最好的催化活性，87.87%的LFX在MMB700/PS体系中被去除。此外，重复使用3次后仍可保持67.90%的LFX降解效率。淬火实验、电子自旋共振 (ESR) 检测和电化学测试结果表明，非自由基途径和直接电子转移途径都促进了 LFX 降解。LFX被O ₂ ^·-和¹ O ₂、O ₂ ^·-氧化作为主要的活性物种。PS活化由MMB700的活性位点诱导。这项工作不仅开发了一种有前景的用于抗生素消除的磁性生物炭 PS 催化剂，而且有助于深入了解 PS 活化机制。