Ceramic Glazed Antibacterial Self-cleaning Film Fabrication Process And Performance

The performance of antibacterial ceramics depends on the antibacterialagent. Ag series and TiO₂ series are two primary types of inorganicantibacterial agents which are used to manufacture antibacterial ceramics.There are mainly two methods to make them loaded with the ceramics: one isto add the antibacterial agents directly into glaze of the ceramics and anotheris to make them filmed onto the glaze. In this study, the antibacterial ceramicswas prepared by loading Nano-Ag/TiO₂ thin film onto the galze. Thepreparation of steady Nano-TiO₂ water-sol and the thermal treatment ofNano-Ag/TiO₂ thin film were studied, so did their effects on photo-catalyticdegradation and antibacterial performance of the film.Steady Nano-Ag/TiO₂ water-sol was prepared by peptization process.The Zeta potential, transmission and size distribution of the sol wereinvestigated, and its preparation process conditions were optimized accordingto the effects ofpH value, sol concentration, concentration of peptizator, waterbath temperature and embedding of Ag on sol dispersion stability. Themicrostructure of the film on galze was observed by SEM and its content wasdetected by EDS. The 0.05-0.3mol/L Nano-Ag/TiO₂ water-sol prepared by 5%HNO₃ or 3% HCl at pH=1.2-2.0 in water bath at T=60-80℃would exhibitedgood stability, and HNO₃ is the better peptizator.The thermal treating parameters influencing the photo-catalyticdegradation capability were crystalloid structure, particle diameter of TiO₂powder, besides that other facts such as film thickness, surface structure andembedding metal were also important. The photo-catalytic degradation ratesof methyl orange and antibacterial properties of Nano-Ag/TiO₂ thin film onceramics were investigated in this study. XRD was used to detect the structureof film to clarify the impacts on the rates and properties. The effect of filmlayers, heating temperature, heating time and embedding of Ag⁺ on thedegradation rates and antibacterial properties were ascertained. TheNano-Ag/TiO₂ film of 3 layers with AgNO₃ 3% embedded and treated at 350℃for 2h would exhibited good performance.