Preparation and antibacterial properties of Ag₆Si₂O₇-TiO₂/PP composite photocatalytic material

To study the photocatalytic and antibacterial properties of modified TiO₂ on the surface of polypropylene (PP), silver pyrosilicate-titanium dioxide (Ag₆Si₂O₇-TiO₂) photocatalyst material was prepared by in-situ deposition, and it was loaded on the surface of PP nonwovens material which pretreat by silane coupling agent through impregnation method. The crystal structure, surface morphology and chemical composition were characterized by SEM, XRD, XPS, UV-vis and photoluminescence spectroscopy (PL). The results show that Ag₆Si₂O₇-TiO₂/PP composite photocatalytic material is successfully prepared, in which the mass fraction of Ag₆Si₂O₇ is 1wt% and the concentration of loaded PP nonwovens is 2 g/L. In order to characterize the photocatalytic degradation of dyes by Ag₆Si₂O₇-TiO₂/PP, the methyl orange solution are used as degradation substance, Ag₆Si₂O₇-TiO₂/PP is treated under xenon lamp light with 300 W for 120 min, and the degradation rate reach 95.6%. In order to characterize the antibacterial properties of Ag₆Si₂O₇-TiO₂/PP, the antibacterial effects of Ag₆Si₂O₇-TiO₂/PP on Staphylococcus aureus and Escherichia coli under visible light and no light are contrasted. The results show that the bacteriosta-tic rates of Ag₆Si₂O₇-TiO₂/PP against both bacteria under visible light are more than 99.99%.