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AssigneeNanosci Spolka Z Ograniczona Odpowiedzialnoscia
InventorsAdriana ZALESKA-MEDYNSKA, Pawel MAZIERSKI, Adam KADZIELA, Bartosz SROKA
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The invention relates to a paste with photocatalytic properties for purifying the air from volatile organic compounds, inorganic compounds, microorganisms, in particular toluene, formaldehyde, NOx, SO2 and Psedomonas aeruginosa bacteria from the air, as well as porous materials having a layer of photocatalytic paste and a method of producing thereof. The invention is used to remove volatile organic compounds, inorganic compounds and pathogenic microorganisms suspended in the air, such as bacteria, fungi, fungal spores and viruses. The invention is used especially in devices for deodorization and purification of air streams for photocatalytic removal of microorganisms and volatile organic compounds, stationary and portable devices for purification and deodorization of air in closed rooms (homes, offices, sports halls, medical facilities), in window devices, in devices built into air conditioning systems. The invention is used to purify the air from volatile organic compounds (VOCs), inorganic compounds such as toluene, formaldehyde, NOx and SO2, NH3 and microorganisms—bacteria, fungi, fungal spores, viruses.
Photocatalytic paste for air purification from volatile organic compounds, inorganic compounds and microorganisms containing TiO2, water and a cross-linking agent, wherein that TiO2 is in an amount from 2% to 30% by weight of the total paste mass, and aspartic acid or ascorbic acid or acetic acid or citric acid or formic acid or sodium citrate or oxalic acid is used as a cross-linking agent, preferably aspartic acid or citric acid or acetic acid or oxalic acid, the paste further containing chitosan in an amount such that the ratio of chitosan to the cross-linking agent is from 10:1 to 1:20, especially 1:2, 1:4 and 1:5, and the chitosan in the paste is in an amount from 0.40 to 43.5% by weight in relation to the amount of TiO2 used, and the cross-linking agent ranges from 0.4 to 87% by weight in relation to the amount of TiO2 used, wherein the chitosan used is one with a low molecular weight or medium molecular weight or high molecular weight, and wherein the paste contains water in such an amount that the ratio of water to the cross-linking agent is from 1.5:50 to 1.5:1000.
A method for obtaining a photocatalytic paste for air purification from volatile organic compounds, inorganic compounds and microorganisms containing TiO2, water and a cross-linking agent, wherein by preparing the base by mixing a cross-linking agent being an aspartic acid or ascorbic acid or acetic acid or citric acid or formic acid or sodium citrate or oxalic acid, preferably ascorbic acid or citric acid or acetic acid or oxalic acid in an amount from 2% to 30% by weight of the total paste mass, chitosan in an amount from 0.40 to 43.5% by weight in relation to the amount of TiO2 used in the next step, and water in relation to the cross-linking agent from 1.5:50 to 1.5:1000, and the ratio of chitosan to the cross-linking agent is from 10:1 up to 1:20, especially 1:2, 1:4 and 1:5, preferably homogenized by intensive stirring combined with ultrasound until a uniform consistency is obtained, and after obtaining a homogeneous mixture, TiO2 is added to the base thus obtained in an amount of 2% to 30% by weight to the total paste mass and stirred again, preferably by ultrasonic-assisted homogenization, until all paste ingredients are thoroughly mixed.
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