Preparation and Properties of Visible Light-active Self-cleaning Porcelain Insulators
Wenxi Liu · Cailiao gongcheng · 2014
Using low-cost TiOSO4as the starting material,a visible light-active nitrogen-doped N-TiO2 sol was prepared by the low-temperature hydrothermal crystallization method.Then the N-TiO2sol, together with a SiO2sol,was coated on the surface of porcelain insulators by the spraying technique, forming a N-TiO2/SiO2composite film.After 8hillumination under visible light,the insulator sample had its photodegradation ratio of methyl orange in aqueous solution up to 90%.After 30min illumination under visible light,the contact angle between water and the composite film decreased from 28.2° to 7.4°,and this ultra-hydrophilic property could be maintained for 2-3days in darkness.Taken together,the newly prepared composite film has good photocatalytic and self-cleaning abilities,which may help effectively reduce the occurrence of pollution flashover accidents.