Microbial contamination of water represents a great threat to the public health that has attracted worldwide attention. In this work, polypyrrole magnetic nanoparticles (Fe₃O₄@PPy NPs) with sterilization properties were fabricated. More specifically, the Fe₃O₄@PPy NPs obtained via aqueous dispersion polymerization and an in situ chemical oxidative polymerization exhibited a cationic surface and high photothermal conversion efficiency. More than 50% of bacteria adsorption can be achieved at a dosage of 100 μg/mL Fe₃O₄@PPy NPs under magnetic field, and high photothermal sterilization efficacy (~100%) can be obtained upon NIR exposure at the same dosage for 10 min. Noteworthy, the Fe₃O₄@PPy NPs can be recycled by magnetism and reused without affecting their photothermal sterilization capability. This study clearly provides experimental evidence of the great potential of Fe₃O₄@PPy NPs as stable and reusable nanocomposite materials for bacteria adsorption and photothermal sterilization performance. The application of Fe₃O₄@PPy NPs can realize enviromental-friendly bacterial contaminated water treatment as well as provide stratgies for synergistical antibacterial materials design.

水的微生物污染对公众健康构成了巨大威胁，引起了全世界的关注。在这项工作中，制备了具有杀菌性能的聚吡咯磁性纳米颗粒（Fe ₃ O ₄ @PPy NPs）。更具体地说，通过水分散聚合和原位化学氧化聚合获得的Fe ₃ O ₄ @PPy NPs显示出阳离子表面和高的光热转化效率。Fe ₃ O ₄的剂量为100μg/ mL时，可以实现超过50％的细菌吸附在相同剂量的NIR下暴露10分钟后，在磁场下@PPy NPs可以获得很高的光热灭菌效率（〜100％）。值得注意的是，Fe ₃ O ₄ @PPy NPs可以通过磁力回收并重新使用，而不会影响其光热杀菌能力。这项研究清楚地提供了Fe ₃ O ₄ @PPy NPs作为稳定和可重复使用的纳米复合材料在细菌吸附和光热杀菌性能方面的巨大潜力的实验证据。Fe ₃ O ₄ @PPy NPs的应用可以实现对环境友好的细菌污染水处理，并为协同抗菌材料设计提供策略。