Preparation, Photocatalytic Property and Antibacterial Property of Ag@TiO2@SiO2 Composite Nanomaterials

TiO2@SiO2 composites with core-shell structure were successfully synthesized using SiO2 as template by Sol-Gel method. Ag nanoparticles (NPs) were photo-deposited on the surface of TiO2@nSiO(2) to form core-shell Ag@TiO2@ SiO2 composites. The resulting samples were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscope (XPS) and UV-Vis diffuse reflectance spectra (DRS). The photocatalytic activity was evaluated by photocatalytic degradation of rhodamine under UV light, and the antibacterial activity against E. coli and S. aureus was also measured. In comparison to TiO2@ SiO2, Ag@TiO2@ SiO2 exhibited higher photocatalytic activity and antibacterial efficiency after loading uniform Ag NPs on the TiO2. When the concentration of Ag is 0.6 mg/ mL, the antibacterial rates against E. coli and S. aureus are 93.41% and 97.37%, respectively. This Ag@TiO2@SiO2 may be used in wastewater treatment, medical equipment and other fields due to its excellent photocatalytic activity and antibacterial property.