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Transparent photocatalytic coating for generating free radicals in situ under visible light to resist microorganisms, odors and organic compounds

A free radical and microbial technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, catalyst activation/preparation, etc., can solve short-term effective problems

Inactive Publication Date: 2022-03-18
蕾特哈清洁技术股份公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, the dyes are photocatalytically degraded, resulting in short-term effective

Method used

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  • Transparent photocatalytic coating for generating free radicals in situ under visible light to resist microorganisms, odors and organic compounds
  • Transparent photocatalytic coating for generating free radicals in situ under visible light to resist microorganisms, odors and organic compounds
  • Transparent photocatalytic coating for generating free radicals in situ under visible light to resist microorganisms, odors and organic compounds

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] A liquid composition comprising a) 0.01-3wt.% TiO 2 Nanoparticles, anatase type, average primary size 5-10 nm; b) 0.1–1 wt.% nitric acid; c) 0.00001–0.0025 wt.% AgCl; d) 0-0.1 wt.% isopropanol; e) 95.8975–99.88999 wt.% pure water.

[0071] TiO 2 The average particle size (5-10nm) is just equal to or higher than the Bohr radius. This allows TiO 2 Maximization of coating surface area without losing significant absorption of visible light due to exciton quantum confinement.

[0072] Nitric acid was used as a stabilizer to prevent nanoparticle aggregation. Acids work by protonating the surface of the particles and thus giving them a positive surface charge. Charged particles repel each other and do not clump together. Other acids such as hydrochloric or sulfuric acid may be used. Alkalis can also be used, which create a negative surface charge.

[0073] AgCl was used as a source of silver ions. Silver ions act as dopants, replacing TiO 2 The titanium atoms in the ...

Embodiment 2

[0078] A method for providing on-site a liquid composition against dirt, microbes and odours, comprising a) diluting the liquid composition 1-fold (undiluted) to 10-fold (1 part composition to 10 parts purified water) if desired ); b) applying the composition to the surface, for example, by spraying the composition with an electrostatic spray gun at a specified distance from the target surface to be coated, such that the visible spray plume ends at 10-20 cm from the target surface; c) allowing The deposited particles were completely dried, which took about 2 hours.

Embodiment 3

[0080] A method of producing a liquid composition comprising the steps of a) rapidly mixing 0.1-10 wt.% titanium isopropoxide with the following solutions under high agitation: 88.988-99.88999 wt.% pure water, 0.01-1 wt.% nitric acid and 0.0001 - 0.002 wt.% AgCl; b) evaporation of excess isopropanol formed during the reaction at a vacuum pressure of 1 - 999 mbar and c) peptization at a temperature of 30 - 99°C. These last two steps can be performed simultaneously for a period of time that will depend on the initial reagent volume. Steps b) and c) can advantageously be carried out in one and the same step, e.g. removing excess alcohol by vacuum evaporation using a temperature between room temperature and 100° C. and an absolute pressure between 0.1 mbar and ambient pressure, the treatment time depending on volume.

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Abstract

A transparent photocatalytic coating for generating free radicals in situ under visible light to combat microorganisms, odors and organic compounds is disclosed, characterized in that the catalytic material comprises a dopant and has a particle size distribution suitable for exciton confinement to accumulatively transfer the photocatalytic process into the visible light range. In addition, the present invention features a method of producing the photocatalytic material described herein. In addition, a method of applying a photocatalytic coating to a venue surface is disclosed. Finally, the invention is characterized in that contaminants and microorganisms of the venue are removed using a photocatalytic coating.

Description

technical field [0001] The present invention relates to containing TiO 2 Photocatalytic compositions extending to visible light, and particularly, but not exclusively, to such photocatalytic compositions intended to reduce cleaning frequency and / or cleaning effort; and methods of producing, applying and using such compositions. This article will refer to photocatalytic compositions which are effective in in situ generation of free radicals over a wide range of light for cleaning and combating odors, dirt and microorganisms, these are preferred compositions, but the following descriptions and definitions also apply for use in Compositions for other purposes. [0002] the term [0003] In the context of the present invention, the following terms are interpreted as follows: [0004] Exciton: In semiconductors, the term excitons defines a pair consisting of charged particles (a negatively charged electron and a positively charged electron-hole) located in a material. Alternati...

Claims

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Application Information

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IPC IPC(8): C01G23/047B01J21/06B01J23/50B01J27/02B01J27/06B01J27/24B01J35/00B01J37/04
CPCB01J35/39B01J37/10B01J37/0063B01J37/0207B01J37/088B01J37/0213B01J37/18B01J37/14B01J23/78B01J23/34B01J23/06B01J23/26B01J35/397B01J21/063A61L2/088A61L2/22A61L9/01A61L9/14A61L9/205B01J23/50B01J35/40B01J35/50
Inventor 克里斯多夫·詹姆斯·吕舍尔迭戈·加尔迪尼
Owner 蕾特哈清洁技术股份公司
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