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PREPARATION AND APPLICATIONS OF STABILIZED METAL NANOPARTICLES FOR DECHLORINATION OF CHLORINATED HYDROCARBONS IN SOILS, SEDIMENTS AND GROUNDWATER
PREPARATION AND APPLICATIONS OF STABILIZED METAL NANOPARTICLES FOR DECHLORINATION OF CHLORINATED HYDROCARBONS IN SOILS, SEDIMENTS AND GROUNDWATER
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机译:稳定的金属纳米粒子在土壤,沉积物和地下水中氯化氯脱氯的制备及应用
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摘要
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 oil subsurface or groundwater contaminated with a chlorinated organic compound to provide in-situ dechlorination.
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