NANOCRYSTALLINE TITANIUM DIOXIDE-BASED COMPOSITION, METHOD FOR PREPARATION THEREOF AND METHOD OF USING SAID COMPOSITION TO OBTAIN PHOTOCATALYTIC COATING ON GLASS Russian patent published in 2013 - IPC C01G23/47 B01J21/06 B01J19/12 B01J35/10 B82B1/00 B82B3/00 B01J37/02 B01J37/34 C03C25/10 C03C25/16 C03C25/42 

FIELD: chemistry.

SUBSTANCE: invention relates to production of photocatalytic coatings of nanocrystalline titanium dioxide. Described is a composition for obtaining a photocatalytic coating based on nanocrystalline titanium dioxide with average particle size of 5-100 nm and specific surface area of 10-300 m²/g, water and a stabiliser, characterised by the following composition: TiO₂ - 1-10 wt %, H₂O - 85-98 wt %, stabiliser - 1-5 wt %, wherein the nanocrystalline titanium dioxide has a phase composition, 50-100% of which consists of "anatase" crystalline modification. Described is a method of preparing said composition, involving mixing titanium dioxide, water and stabiliser and subjecting the obtained mixture to ultrasound, wherein the mixture of titanium dioxide, stabiliser and water, taken in amount of not more than 10% of its total volume, is masticated for not less than 5 minutes into a homogeneous paste-like mass into which, while stirring continuously, the remaining amount of water is added, and the mixture then subjected to ultrasound with operating frequency of 35 kHz and generator power of 50 W for not more than 15 minutes at room temperature. Described is a method of obtaining a photocatalytic coating on a glass substrate using said composition, involving immersing the substrate in the composition, drying the substrate at room temperature and calcining in an atmosphere of air at temperature of 300-600°C and cooling, characterised by that, before coating, the surface of the glass substrate is first treated with a freshly prepared solution obtained from concentrated sulphuric acid and 30% hydrogen peroxide solution in volume ratio H₂SO₄:H₂O₂=7:3, and then washed with distilled water to pH 6-7 and subjected to ultrasonic treatment with operating frequency of 35 kHz and generator power of 50 W for 5-30 minutes at room temperature; the glass substrate is then immersed in the composition prepared as described above for not less than 5 minutes, dried for not less than 24 hours in the presence of a drying agent and calcined in an atmosphere of air for 10-15 minutes, and heating and cooling is carried out at a rate of not more than 1.5°C/min.

EFFECT: efficient and stable photocatalytic coating is obtained, which is suitable for use in flowing water treatment systems.

5 cl, 6 dwg, 2 tbl, 4 ex