科研之友
微信
新浪微博
Facebook
分享链接
摘要
Silver (Ag) nanoparticles are effective disinfectants that offer a broad-spectrum of antibacterial activities. However, concerns about releasing Ag-based disinfectants into environment have significantly limited their large-scale applications. In this study, a facile and environmentally benign method was developed to grow Ag nanoparticles on polydopamine-functionalized Fe3O4 particles, forming a hierarchical Fe3O4-polydopamine-Ag nanocomposite. The polydopamine layer was coated on the surface of the Fe3O4 particles via self-polymerization under ambient conditions; it subsequently facilitated the formation of Ag nanoparticles from [Ag(NH3)(2)](+) and provided anchoring sites for the immobilization of the Ag nanoparticles. The nanocomposite presented excellent antibacterial activities against both Gram-negative (Escherichia coli) and Gram-positive (Staphylococcus aureus) bacteria, with respective minimum inhibitory concentration as 40 and 60 mu g/mL, respectively. Furthermore, the nanocomposite can be separated and recovered magnetically, avoiding environmental contamination and enabling particle reuse. Recycling tests showed that over 60% of the original antibacterial activity of the particles was retained after 6 cycles of reuse.
