【无机化学学报】doi: 10.11862/CJIC.20250123
Chitosan (CTS) was grafted onto the surface of amino-functionalized silver chloride silicon dioxide (AgCl@SiO2-NH2) cores to obtain AgCl@SiO2/CTS hybrid nanoparticles. The as-obtained AgCl@SiO2/CTS nanoparticles were chlorinated by NaClO solution to get AgCl@SiO2/CTS-based chloramine nano-hybrid materials, denoted as AgCl@SiO2/CTS-Cl. A transmission electron microscope was used to observe the morphology of the as-prepared samples AgCl@SiO2/CTS and AgCl@SiO2/CTS-Cl. At the same time, an X-ray diffractometer and an infrared spectroscope were utilized to characterize their crystal and chemical structures. Besides, ζ potentials were measured to elucidate the surface modification of AgCl nanoparticles by —NH2, the antibacterial mechanism of AgCl@SiO2/CTS-Cl was investigated by scanning electron microscopy, and Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) were used as the to-be-tested strains to evaluate the antimicrobial activity of samples AgCl@SiO2/CTS and AgCl@SiO2/CTS-Cl. Findings demonstrate that sample AgCl@SiO2/CTS exhibits a chain-like structure ascribed to the interaction between —NH2, and each AgCl@SiO2/CTS hybrid nanoparticle contains several AgCl cores. In the meantime, sample AgCl@SiO2/CTS-Cl exhibits excellent antibacterial activity against E. coli and S. aureus, which is attributed to the synergistic antibacterial effect of Ag+ and Cl-. Sample AgCl@SiO2/CTS-Cl with a dosage of 640.00 μg·mL-1 could completely kill the two kinds of tested bacteria in 12 h of incubation; it retains a high antibacterial efficiency even after 10 cycles of antibacterial tests.
