Title of Invention	A METHOD OF PREPARING DRINIKING WATER WITH PESTICIDE CONTENT 0.1 PPM AND BELOW AND DRINKING WATER PREPARED BY THE SAID METHOD
Abstract	A method of preparing drinking water with pesticide content 0.1 PPM and below comprising the steps of making nanopartifcles (2 -150 nm diameter) of Gold and/or silver, followed by soaking alumina globules of average diameter 0.5 cm in a solution fo the nanoparticles of concentration 10-3 moles/litre (concentration of metal ion used) thereby depositing the nanoparticles on the durface of the said globules; washing the globules with the nanoparticles deposited thereon, in water; soaking about 1000 globules in 1 litre of the pesticide containing water to effect the pesticide adsorption on the hanoparticles and thus lower the concentration of the pesticides in the water to 0.1 ppm and below; the globules being separated thereafter from the water

Title of Invention

A METHOD OF PREPARING DRINIKING WATER WITH PESTICIDE CONTENT 0.1 PPM AND BELOW AND DRINKING WATER PREPARED BY THE SAID METHOD

Abstract

A method of preparing drinking water with pesticide content 0.1 PPM and below comprising the steps of making nanopartifcles (2 -150 nm diameter) of Gold and/or silver, followed by soaking alumina globules of average diameter 0.5 cm in a solution fo the nanoparticles of concentration 10-3 moles/litre (concentration of metal ion used) thereby depositing the nanoparticles on the durface of the said globules; washing the globules with the nanoparticles deposited thereon, in water; soaking about 1000 globules in 1 litre of the pesticide containing water to effect the pesticide adsorption on the hanoparticles and thus lower the concentration of the pesticides in the water to 0.1 ppm and below; the globules being separated thereafter from the water

Full Text	This invention relates to a method of purifying water containing pesticides (Chlorpyrifos and Malathion) It is well known that water taken out from the subsoil through bore wells and the like usually contain pesticides at a level, which is harmful for human consumption. However, such water will be acceptable for drinking purposes if the pesticide content is reduced to acceptable levels. This invention, therefore, proposes a method as aforesaid which is simple, yet effective. The method, according to this invention, for purifying water containing the above pesticides of concentration greater than or equal to 0.1 ppm comprises the steps of making nanoparticles (2- 150 nm diameter) of metals of gold, silver and copper, followed by soaking alumina globules of average diameter 0.5 cm in a solution of the nanoparticles of concentration 10 moles/litre (concentration of metal ion used) thereby depositing the nanoparticles on the surface of the said globules; washing the globules, with the nanoparticles deposited thereon, in water; soaking about 1000 globules in 1 litre of the pesticide containing water to effect the pesticide adsorption on the nanoparticles and thus lower the concentration of the pesticides in the water to 0.1 ppm and below; the globules being separated thereafter from the water by filtration. EXAMPLE Nanoparticles of metals selected (Silver, Gold and Copper) are prepared in the known way. Alumina (AI2O3) globules of average 0^5 cm diameter are soaked in a solution of the nanoparticles in water of . concentration 10^ moles/litre (concentration of the metal ion used) for 6 hours to deposit the nanoparticles on the surface of the said globules. The globules are then washed with water. About 1000 globules are then mixed with 1 litre of the water to be treated to cause the pesticides in the water to be adsorbed by the nanoparticles and thus lower the concentration of the pesticides in the water to 0.1 ppm and below. The globules are separated thereafter from the water by filtration. The method described above is applicable to the pestcides chlorpvv'^I^Hoiand malathion. The terms and expressions herein are of description and not of limitation, having regard to the scope and ambit of this invention. The concentration limit described above is not the limitation of the process, but that of the detection methodology applied. soaking alumina globules'of, average diameter 0.5 cm in a solution of the nanoparticles 'of. concentration 10' moles/litre (concentration of metal ion used) thereby depositing the nanoparticles on the surface of the said globules; washing the globutes. with the nanoparticles concentration of the pesticides in the water to 0.1 ppm and below; the globules being separated thereafter from the water. A method of purifying water containing pesticides greater than or equal to 0.1 ppm and above as herein described and

Full Text

This invention relates to a method of purifying water containing pesticides (Chlorpyrifos and Malathion)
It is well known that water taken out from the subsoil through bore wells and the like usually contain pesticides at a level, which is harmful for human consumption.
However, such water will be acceptable for drinking purposes if the pesticide content is reduced to acceptable levels.
This invention, therefore, proposes a method as aforesaid which is simple, yet effective.
The method, according to this invention, for purifying water
containing the above pesticides of concentration greater than or
equal to 0.1 ppm comprises the steps of making nanoparticles (2-
150 nm diameter) of metals of gold, silver and copper, followed by
soaking alumina globules of average diameter 0.5 cm in a solution
of the nanoparticles of concentration 10 moles/litre
(concentration of metal ion used) thereby depositing the nanoparticles on the surface of the said globules; washing the globules, with the nanoparticles deposited thereon, in water; soaking about 1000 globules in 1 litre of the pesticide containing

water to effect the pesticide adsorption on the nanoparticles and thus lower the concentration of the pesticides in the water to 0.1 ppm and below; the globules being separated thereafter from the water by filtration.
EXAMPLE
Nanoparticles of metals selected (Silver, Gold and Copper) are prepared in the known way.
Alumina (AI2O3) globules of average 0^5 cm diameter are soaked in a solution of the nanoparticles in water of . concentration 10^ moles/litre (concentration of the metal ion used) for 6 hours to deposit the nanoparticles on the surface of the said globules. The globules are then washed with water.
About 1000 globules are then mixed with 1 litre of the water to be treated to cause the pesticides in the water to be adsorbed by the nanoparticles and thus lower the concentration of the pesticides in the water to 0.1 ppm and below. The globules are separated thereafter from the water by filtration.
The method described above is applicable to the pestcides chlorpvv'^I^Hoiand malathion.

The terms and expressions herein are of description and not of limitation, having regard to the scope and ambit of this invention. The concentration limit described above is not the limitation of the process, but that of the detection methodology applied.

soaking alumina globules'of, average diameter 0.5 cm in a solution of the nanoparticles 'of. concentration 10' moles/litre (concentration of metal ion used) thereby depositing the nanoparticles on the surface of the said globules; washing the globutes. with the nanoparticles

concentration of the pesticides in the water to 0.1 ppm and below; the globules being separated thereafter from the water.

A method of purifying water containing pesticides greater than or equal to 0.1 ppm and above as herein described and

Documents:

051-che-2004-abstract.pdf

051-che-2004-claims filed.pdf

051-che-2004-claims granted.pdf

051-che-2004-correspondnece-others.pdf

051-che-2004-correspondnece-po.pdf

051-che-2004-description(complete) filed.pdf

051-che-2004-description(complete) granted.pdf

051-che-2004-form 1.pdf

051-che-2004-form 19.pdf

051-che-2004-form 26.pdf

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Patent Number

200767

Indian Patent Application Number

51/CHE/2004

PG Journal Number

8/2007

Publication Date

23-Feb-2007

Grant Date

02-Jun-2006

Date of Filing

22-Jan-2004

Name of Patentee

M/S. INDIAN INSTITUTE OF TECHNOLOGY

Applicant Address

III P.O. CHENNAI 600 036.

Inventors:

#	Inventor's Name	Inventor's Address
1	DR. THALAPPIL PRADEEP	INDIAN INSTITUTE OF TECHNOLOGY, III P.O. CHENNAI 600 036.
2	APPUKUTTAN NAIR, SREE KUMARAN NAIR	INDIAN INSTITUTE OF TECHNOLGY, IIT P.O. CHENNAI 600 036

PCT International Classification Number

C02F1/00

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA