FIELD: chemistry.
SUBSTANCE: method of preparing aqueous dispersions of TiO2 nanoparticles in form of anatase involves reaction of titanium alkoxide with water in the presence of a mineral acid and a nonionic surfactant while heating. The titanium alkoxide is selected from a group comprising titanium methoxide, ethoxide, n-propoxide, isopropoxide, n-butoxide and isobutoxide. The mineral acid is a halogen acid. The surfactants have a polar functional group of the ether or ester type. The titanium alkoxide/halogen acid molar ratio ranges from 0.005 to 15. In an alternative method, the solution which contains titanium alkoxide, mineral acid and surfactant is mixed with a transition metal salt, for example Ag or Cu or Ce, and a dispersion of TiO2 nanoparticles is obtained, where Ti is deposited on the said metal. The obtained dispersions of TiO2 nanoparticles are used to produce photocatalytic coatings on a surface which requires such processing, as well as for photocatalytic cleaning of gases and liquids.
EFFECT: method enables to obtain a dispersion of TiO2 nanoparticles which do not exhibit adhesion, coagulation and deposition of a solid material even after prolonged storage of the dispersed product, and are uniform, have photocatalytic activity and are transparent.
18 cl, 1 dwg, 7 ex
