|
Preparation of nano-TiO 2 sol process at a low temperature liquid phase method, by adding acetic acid, diethylamine, oleic acid and sodium stearate structure modifier can be prepared having a granular, rod-like, spindle-shaped, spherical, and the bundles of nano TiO 2 dry gel particles, nano-TiO 2 sol on the glass surface by dip method film-forming, dried, calcined and other processes, preparation of nanocrystals of different morphologies TiO 2 film. Studied the the the film photocatalytic activity, hydrophilicity, antibacterial properties and adhesion of macroscopic properties and crystal type, surface structure, absorption spectroscopy, and thermal gravimetric microscopic performance. When using acetic acid as a conditioning agent, tetrabutyl titanate: molar ratio of acetic acid were 1:0,1:2 and 1:4 can be prepared separately to the small particles, rod-like and spherical structure nano-TiO 2 xerogel particles. Spherical structure of the gel particle film formation after calcination at 550 ℃, the system film contact angle 6.0 °, 1h after UV light exposure, 92.7% decolorization rate of methyl orange solution. Diethylamine as a structure modifier when optimizing obtained under the conditions of Nano TiO 2 dry gel particles to the rules of rod-like structure. The film forming 350 ° C calcined 2h prepared nano-TiO 2 film, the collapse of the rod-like structure, the TiO 2 crystal transition temperature significantly reduced rutile structure content of 26.5%. The film contact angle of 7.8 ° decolorization of methyl orange solution was 85.9%. Select oleic acid as a structure modifier in the added amount 16 mmol.L -1 , spindle-shaped morphology uniformity can be obtained nano-TiO 2 dry gel particles. Calcination temperature of 350 ° C, under the the 2h conditions of the roasting time system of nano TiO 2 the film photocatalytic activity and hydrophilic best film contact angle of 6 °, methyl orange solution decolorization rate of 92.9%. Nano TiO 2 the film stable spindle-shaped structure, UV - visible diffuse reflectance spectra show the film absorption spectrum of the \An optional added amount of 0.02 mol · L -1 of sodium stearate as a structure modifier can be prepared by the uniform structure of the nano fascicular TiO 2 of dry gel particles. The film formation after calcination at 500 ℃ 2h films in the rutile structure content of 29.2%, the contact angle of 2 ° of methyl orange solution decolorization rate of 93.5%, the absorption spectrum of the \Glass substrate 2 sol sol - gel preparation of nano SiO , respectively, using the pulling step, two steps pulling prepared the the SiO 2 / TiO 2 composite membrane. Best the SiO 2 15% addition level of the composite film photocatalytic and hydrophilic properties, low concentrations of methyl orange decolorization rate was 89.7%, the contact angle is less than 5 °. Absorption spectroscopy to demonstrate compliance with the film \The composite films have good photocatalytic activity, hydrophilicity, antibacterial properties and binding force.
|