Pathogen and biofilm contamination in aqueous systems leave millions of people at risk of waterborne diseases. Herein, to address this issue, a green and highly efficient strategy is developed to concurrently trap and kill bacteria, eliminate the debris and the existing biofilm matrix in water environment via magnetic microparticles. The particles (TPFPs) were prepared from the in-situ deposition of Fe₃O₄ nanoparticles onto the surface of antibacterial functionalized microcrystalline cellulose (MCC). Noticeably, TPFPs can completely inactivate both S. aureus and E. coli once contacting for 30 min by disrupting the bacterial membrane. Meanwhile, the MCC-based magnetic particles retained 100% biocidal efficiency against E. coli (5 * 10⁴ E. coli/mg particles) during ten recycling procedures without any treatment. More importantly, according to the results of trapping behavior and antibiofilm assays, not only bacteria could be captured by the particles (trapping rate was over 85%), but also the residual debris from dead bacteria and fragmented biofilm was together removed based on the special structure and functions of the antibacterial particles (~ 80%), including extremely rough surfaces, surficial positive charge and magneto-responsive property. This study presents an efficient approach for microorganism management in water system which can be expectantly applied to improve the water safety

水系统中的病原体和生物膜污染使数百万人面临水传播疾病的风险。在此，为了解决这个问题，开发了一种绿色高效的策略，通过磁性微粒同时捕获和杀死细菌，消除水环境中的碎片和现有的生物膜基质。_{通过将Fe 3} O _{4纳米颗粒}原位沉积到抗菌功能化微晶纤维素(MCC)表面上制备颗粒(TPFP ) 。值得注意的是，TPFP 可以完全灭活金黄色葡萄球菌和大肠杆菌一旦通过破坏细菌膜接触30分钟。同时，基于 MCC 的磁性颗粒对大肠杆菌（5 * 10 ⁴ E. coli/mg 颗粒）在十次回收过程中未经任何处理。更重要的是，根据捕集行为和抗菌膜检测结果，不仅细菌可以被颗粒捕获（捕集率超过85%），而且死菌残留的碎片和破碎的生物膜通过特殊的处理方式一起被去除。抗菌颗粒（~80%）的结构和功能，包括极其粗糙的表面、表面正电荷和磁响应特性。本研究提出了一种有效的水系统微生物管理方法，可预期应用于提高水安全