Coating processes – Magnetic base or coating
Reexamination Certificate
2011-02-15
2011-02-15
Le, H. (Holly) T (Department: 1788)
Coating processes
Magnetic base or coating
C405S128150, C405S128450, C405S128750, C427S132000, C427S216000, C427S217000, C427S220000, C588S316000
Reexamination Certificate
active
07887880
ABSTRACT:
A stabilized, chemically reactive, metallic nano-material effective for degradation of chlorinated organic compounds in soils, sediments and groundwater. The nano-material is composed of a magnetic metal nanoparticle and a carbohydrate stabilizer bound to the nanoparticle. The preferred metal nanoparticle is iron and the preferred carbohydrate stabilizer is either a starch or a water soluble cellulose such as sodium carboxymethyl cellulose. The nanoparticle may be either mono-metallic, bi-metallic or multi-metallic in nature, but is preferably bi-metallic wherein it is coated with a secondary catalytic metal coating, preferably palladium. A method of making the metallic nano-material is further disclosed wherein a solution of the metal nanoparticle and carbohydrate stabilizer is prepared, and the nanoparticle is then reduced under inert conditions. A process for reductive dechlorination of chlorinated organic compounds is also disclosed wherein the reduced magnetic metal nanoparticle is prepared, and then contacted with a chlorinated organic compound to dechlorinate the compound. Preferably, the nano-material is injected into a site such as soil subsurface or groundwater contaminated with a chlorinated organic compound to provide in-situ dechlorination.
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He Feng
Zhao Dongye
Andrus, Scales, Starke & Sawall, LLP
Auburn University
Le H. (Holly) T
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