Photocatalytic auto-cleaning process of stains
AssigneeCouncil of Scientific and Industrial Research
InventorsPushpito Ghosh, Raksh Jasra, Dipak Shukla, Anjani Bhatt, Rajesh Tayade
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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.
Claims20
A process for photocatalytically cleaning stains on a surface, the process comprising:
- i) coating the surface with a thin film of a photo-catalytic semi-conductor material having a band gap energy;
- ii) providing a fluorescent lamp emitting visible light of desired sufficient intensity, the lamp emitting light having wavelength greater 300 nm and UV radiation having band gap energy higher than the semi-conductor in order to photoexcite the semiconductor particulate;
- iii) energizing the lamp to illuminate surrounding ambience of the surface and impinge UV radiation and visible light on the thin film;
- iv) exposing the stain on the semiconductor coated surface to fluorescent light to photocatalytically decompose the stain.
Dependencies are inferred from the claim text.