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A process for the adsorption of contaminants from water using silica aerogel/granularactivated carbon (GAC) composites has been developed by Lawrence LivermoreNational Laboratory (LLNL). Like GAC, the aerogel has a very large surface area(approximately 1000 m2/g), but it has the added advantage of being hydrophobic with a low density. Unlike GAC, the composite can remove both volatileorganic compounds (VOCs) and metals. Previous work at LLNL has investigated uranium removal by a phosphorous enrichedhydrophobic aerogel/GAC composite. Producing a P-enriched aerogel-GAC compositeimproved uranium removal above the GAC without the composite. Varying the type andamount of phosphorous (phosphonate, 1% or 17% Hsub3/subPOsub4/sub) affected uranium removal,based upon analysis of isotherm data. Additionally, adsorbency was confirmed via columntests and a field demonstration. This paper briefly discusses this uranium-related work todemonstrate the potential for aerogel-GAC composite materials to remove oxo-anions. Includes table, figures.

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Edition: Vol. - No. Published: 06/17/2005 Number of Pages: 5File Size: 1 file , 570 KB