In this study, we prepared a new type of recyclable Co@Ag core–shell nanomaterials with a very simple method named displacement reaction. Co@Ag core–shell nanomaterials were prepared in AgNO3 solution with cobalt nanomaterials as the core, while the surface was coated with silver nanomaterials. Co@Ag core–shell nanomaterials were characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and oscillating sample magnetometer (VSM).We

more »

... und that the diameter of the Co@Ag core–shell nanomaterials was about 100nm, which was exhibited in form of elemental elements andobvious magnetic properties.In order to evaluate the bacteriostatic effect of Co@Ag core–shell nanomaterials, we used qualitative and quantitative methods to assess the bacteriostatic effect of these materials on standard strains of Pseudomonas aeruginosa (ATCC27853, Gram - negative bacterium), Staphylococcus aureus (ATCC 25923, Gram-positive bacterium), Escherichia coli (ATCC 25922, Gram-negative bacterium) and Candida albicans (ATTC 90029, yeast) in Yellow River water in vitro. The results show that Co@Ag core–shell nanomaterials have a significant antibacterial effect. In addition, Co@Ag core–shell nanomaterials can be recycled through an external magnetic field to reduce environmental pollution. Interestingly, the reclaimed Co@Ag core–shell nanomaterials can still have antibacterial activity and can be reused. These results indicate that Co@Ag core–shell nanomaterials may have potential application as disinfectants for water.