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Photocatalytic auto-cleaning process of stains

a technology of photocatalysis and auto-cleaning, which is applied in the direction of cleaning using liquids, chemical/physical/physical-chemical processes, lighting and heating apparatus, etc. it can solve the problems of insufficient alcohol as solvent, inability to tightly control the ph of colloidal mixtures, and process limitation that can photodecompose bacteria and hazardous chemical compounds (airborne substances). , to achieve the effect of simple and efficient, avoiding complexity

Inactive Publication Date: 2006-06-29
COUNCIL OF SCI & IND RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013] Another object of the invention is to provide stable deposition of photocatalyst on surface of substrate and to ensure that photocatalyst is not removed by flowstream of effluent.
[0016] Another object of the invention is to provide a simple and efficient method of coating a support material, while avoiding complexities involved of known coating techniques. SUMMARY OF THE INVENTION

Problems solved by technology

The drawback associated with this processes are (i) tight control of pH of the colloidal mixture; ii) any alcohol as solvent will not be adequate.
This process has the limitation that it can photo decompose bacteria and hazardous chemical compounds (airborne) substances.
The drawback associated with this process is that the system is effective when binary metal oxides are selected as photocatalyst, and at low pressure.
The drawback associated with method is that this photocatalyst is compatible for decomposition of nitrogen and phosphorous compounds, for cleaning air, exhaust gas and water.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0038] 5 gm of photocatalyst TiO2 mixed with 100 ml of 2% concentration of colloidal silica sol and stirred for 2 hours and sonicated for 30 minutes. This mixture was uniformly sprayed on rough surface of ceramic tile using sprayings machine. The tile was calcined at 450° C. for 3 hours with increase in temperature at the rate of 3° C. per minute.

[0039] In 25 ml of water, 0.5 gm of turmeric and 1.0 gm of chilly was thoroughly mixed, heated to 50° C. to get good dispersion of the turmeric and chilly. The patch of above mixture of 1 cm wide was applied on the ceramic tile coated with photocatalyst horizontally and this tile was kept under fluorescent light. The distance between photocatalyst coated tile and tube light was 2 feet and the intensity of the light was 250 lux. The 75% colour was removed in 26 hours under the tube light.

example 2

[0040] 5 gm of photocatalyst TiO2 mixed with 100 ml of 4% concentration of colloidal silica sol and stirred for 2 hours and sonicated for 30 minutes. This mixture was uniformly sprayed on rough surface of ceramic tile using sprayings machine. The tile was calcined at 350° C. for 3 hours with increase in temperature at the rate of 3° C. per minute.

[0041] In 20 ml of water, 5 ml of vegetable oil, 0.5 gm of turmeric and 1 gm of chilly was thoroughly mixed, heated to 50° C. to get good dispersion of the turmeric and chilly. The patch of above mixture of 1 cm wide was applied on the ceramic tile coated with photocatalyst horizontally and this tile was kept under fluorescent light. The distance between coated tile and fluorescent light was 3 feet and the intensity of the light was 250 lux. The 100% colour was removed in 22 hours.

example 3

[0042] 7 gm of photocatalyst TiO2 mixed with 100 ml of 5% concentration of colloidal silica sol and stirred for 2 hours and sonicated for 30 minutes. This mixture was uniformly sprayed on rough surface of ceramic tile using sprayings machine. The tile was calcined at 450° C. for 3 hours with increase in temperature at the rate of 3° C. per minute.

[0043] In 20 ml of water, 5 ml of vegetable oil, 1 gm of turmeric and 2 gm of chilly was thoroughly mixed, heated to 50° C. to get good dispersion of the turmeric and chilly. The patch of above mixture of 1 cm wide was applied on the ceramic tile coated with photocatalyst horizontally and this tile was kept under fluorescent light The distance between coated tile and fluorescent light was 2 feet and the intensity of light was 250 lux. The 100% colour was removed in 26 hours.

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Abstract

The present invention provides a process for photocatalytically treating stains of chilly and turmeric caused on kitchen tiles and platforms by coating a thin film of photocatalyst made of a semiconductor such as titanium dioxide uniformly dispersed in dilute silica sol thereon and using a light source such as a fluorescent lamp to irradiate and photoexcite the photo catalytic thin film by the small amount of UV radiation included in the fluorescent light, resulting in photo decomposition and auto-cleaning of the stains.

Description

FIELD OF THE INVENTION [0001] The present invention relates to photocatalytic oxidation of spices with titanium dioxide coated on ceramic tiles and in particular relates to reliable and successful use of TiO2 coated ceramic tiles and in-house fluorescent light to degrade persistent stains caused by splashing, spilling of chilies and turmeric on the walls / platform of kitchens. BACKGROUND OF THE INVENTION [0002] Fluid streams such as water or effluents often include contaminants such as dissolved halogenated or organic compounds, nitrogen oxides, halocarbons, pesticides, organic dyes, etc. Photocatalysts can be used to purify fluid streams by converting these contaminants into less harmful materials or substances, which may be more easily removed therefrom. [0003] The conversion of contaminants occurs when the effluent or toxic pollutant is brought in contact with the photocatalyst illuminated by a nearly ultra-violet or fluorescent light source. The photocatalyst is either in the coa...

Claims

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Application Information

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IPC IPC(8): B08B3/12B08B7/00
CPCB01J19/123B01J2219/0892B08B7/0057C03C17/256C03C2217/212C03C2217/213C03C2217/23C03C2217/71C03C2218/112C04B41/5041C04B41/87
Inventor GHOSH, PUSHPITO K.JASRA, RAKSH V.SHUKLA, DIPAK B.BHATT, ANJANI K.TAYADE, RAJESH J.
Owner COUNCIL OF SCI & IND RES
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