METHOD OF PRODUCING PHOTOACTIVE COMPOSITE WITH BACTERIAL ICE PROPERTIES Russian patent published in 2019 - IPC B01J37/00 B01J21/06 B01J23/06 

FIELD: technological processes.

SUBSTANCE: invention relates to a method of producing a photocatalytic composite with bactericidal properties which can be used in cleaning and disinfecting air, water, surfaces of various objects and building structures. Method involves preparation of metakaolin powder with zinc oxide before applying on metakaolin of titanium dioxide precursor. For this purpose zinc oxide precursor solution with concentration of 0.2–0.6 mol/l in isopropyl alcohol is preliminarily prepared with addition of 5 % ammonia solution to solution pH of not less than 11, then metakaolin powder is added thereto and thoroughly mixed, dried until dispersed material formation. Produced disperse material is treated at temperature of 300–700 °C for 1–5 hours, and obtained metakaolin with zinc oxide is cooled to room temperature. Further, solution of titanium dioxide precursor with concentration of 0.2–0.6 mol/l in isopropyl alcohol is prepared with addition of citric acid monohydrate with concentration of 0.6–1.8 mol/l. Precursor of titanium dioxide is titanium tetraisopropoxide. Prepared metakaolin with zinc oxide is added to the obtained solution of titanium dioxide precursor in the form of powder so that the weight ratio of zinc oxide to titanium dioxide is 0.2÷5. Obtained mixture of a solution of a titanium dioxide precursor and metakaolin with zinc oxide is thoroughly mixed, dried until formation of a dispersed material, and the obtained dispersed material is subjected to treatment at temperature of 300–700 °C for 1–5 hours. After that, obtained photoactive composite with weight fraction of metakaolin in it 0.5÷0.8 is cooled down to room temperature.

EFFECT: high photocatalytic activity and high bactericidal action both during irradiation with ultraviolet light and when exposed to visible light, the photocatalytic composite is used for preparing water-dispersion paints for producing functional coatings.

1 cl, 9 dwg, 8 tbl, 10 ex