METHOD OF PRODUCING FIBROUS FILTERING-SORBENT MATERIAL COATED WITH NANO-SIZED TITANIUM DIOXIDE AND FIBROUS FILTERING-SORBENT MATERIAL Russian patent published in 2024 - IPC B05D5/00 

FIELD: various technological processes.

SUBSTANCE: efficient cleaning of indoor air is ensured by methods based on sorption and concentration of contaminants using special substances known as sorbents. Method of producing fibrous filtering-sorbing material with a coating of nano-sized titanium dioxide involves preparing a film-forming solution, followed by holding for 6 hours at room temperature, then it is applied on the surface of articles, dried for 60 minutes, exposed to ultraviolet radiation. Freshly prepared film-forming solution is applied in one layer on fibreglass cloth fibres, dried at 120°C, step-by-step thermal treatment is carried out in the following mode: 300°C for 30 minutes, 400°C for 30 minutes, 500°C for 30 minutes, 600°C for 30 minutes. Obtained material is exposed to ultraviolet radiation with wavelength in range of 380 nm to 400 nm at the following ratio of components of the film-forming solution, wt.%: distilled water 0.2; hydrochloric acid 0.06; silver chloride 0.05; tetraethoxysilane 0.3; tetrabutoxytitanium 0.3; butanol is the rest. Also disclosed is a fibrous filtering-sorbent material for cleaning air media, which is characterized by the following ratio of components, wt.%: silicon dioxide 94; aluminium (III) oxide 3.5; titanium dioxide 2; silver metal 0.5.

EFFECT: group of inventions provides optimization of technological criteria providing a high degree of reproducibility of physical and chemical properties of the obtained material, such as energy of the band gap, which determines the light absorption edge in the visible region, and antibacterial efficiency.

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