Mussel-inspired fabrication of cationic polymer modified rGO supported silver nanoparticles hybrid with robust antibacterial and catalytic reduction performance

摘要

Mussel-inspired strategy was developed to fabricate quaternized polymer modified reduced graphene oxide supported silver nanoparticles hybrid (rGO-QCP-Ag) for efficient antibacterial agent and nanocatalyst. The rGO-QCP-Ag nanohybrid had high positive charge density and decent hydrophilic properties, and the Ag nanoparticles deposited on rGO exhibited ultra-small size and dispersion stability. The as-prepared nanohybrid showed high-efficacy and long-term antibacterial properties against E. coli (G-) and S. aureus (G+), especially, it could rapidly kill E. coli within 2 h at a concentration of 16 mu g/mL. The antibacterial mechanism of nanohybrid mainly involved cell membrane damage and ROS generation. In addition, the nanohybrid displayed highly efficient catalytic reduction for p-nitrophenol and methylene blue. The excellent antibacterial and catalytic properties of the nanohybrid were mainly attributed to its water dispersion stability and the uniformly dispersed small-sized Ag nanoparticles on the polymer-decorated rGO sheets. Meanwhile, combining with the synergistic effect of two-dimensional rGO sheets, the above properties enable the nanohybrid to get in contact with bacteria and reactants effectively, enhancing the antimicrobial and catalytic properties. The excellent properties of the asdesigned nanohybrid are expected to solve the problem of bacterial resistance and environmental pollution that is threatening public health.