Drinking water treatment sludge provides the iron resource and a promising support to create bimetallic composites. In this work, a magnetic Co-Fe/SiO₂ layered catalyst (LC) was synthesized by a facile hydrothermal method and used as an effective peroxymonosulfate (PMS) activator to degrade ciprofloxacin (CIP), a typical refractory antibiotic agent contaminant. Co-Fe/SiO₂ LC exhibited superior catalytic performance with 98% CIP degradation efficiency in 10 min compared to other Co/Fe monometallic oxides and ions. The catalyst had great potential for practical application under various conditions. A synergistic effect between solid Co and Fe occurred on the surface of the catalyst due to the accelerated reduction of Co³⁺ by Fe²⁺. Both sulfate radicals (SO₄^•-) and hydroxyl radicals (^•OH) were produced in the PMS activation process, and SO₄^•- contributed to much more CIP degradation. Based on kinetic models, the CIP degradation at different catalyst loadings could be well predicted. The catalyst showed excellent stability and reusability due to the strong Co/Fe-O and Co/Fe-Si interaction. This work provided a promising iron sludge reuse method to convert the “waste sludge” to a high-efficiency and low-cost bimetallic catalyst for the degradation of refractory organic contaminants in aquatic environments.

饮用水处理污泥为生产双金属复合材料提供了铁资源和有希望的支持。在这项工作中，通过简便的水热法合成了磁性Co-Fe / SiO ₂层状催化剂（LC），并将其用作有效的过氧单硫酸盐（PMS）活化剂，以降解环丙沙星（CIP）（一种典型的难治性抗生素药剂污染物）。与其他Co / Fe单金属氧化物和离子相比，Co-Fe / SiO ₂ LC在10分钟内表现出优异的催化性能和98％的CIP降解效率。该催化剂在各种条件下具有实际应用的巨大潜力。由于Fe ²⁺加速Co ³⁺还原，在催化剂表面产生了固态Co和Fe之间的协同效应。。在PMS活化过程中会同时产生硫酸根（SO ₄ ^•-）和羟基（^• OH），而SO ₄ ^•-则导致了更多的CIP降解。基于动力学模型，可以很好地预测不同催化剂负载量下的CIP降解。由于强的Co / Fe-O和Co / Fe-Si相互作用，该催化剂显示出极好的稳定性和可重复使用性。这项工作提供了一种有前途的铁污泥再利用方法，可以将“废物污泥”转化为高效低成本的双金属催化剂，以降解水生环境中的难降解有机污染物。