13-02-2014 дата публикации
Номер: US20140045682A1
Filter media that includes activated carbon particulates and zinc oxide particles disposed on surfaces of the activated carbon particulates. The zinc oxide particles have an average crystallite dimension that is not greater than about 50 nm. 1. A method of making a filter media , the method comprising:providing an impregnation solution comprising zinc nitrate and nitric acid;contacting a substrate with the impregnation solution to impregnate the zinc nitrate on the substrate; andheating the impregnated solution to convert the zinc nitrate to zinc oxide.2. The method of claim 1 , wherein the impregnation solution comprises the nitric acid at a concentration of at least about 0.5 M.3. The method of claim 2 , wherein the nitric acid has a concentration of at least about 2.0 M.4. The method of further comprising contacting the substrate with a second impregnation solution.5. The method of further comprising contacting the substrate with a high molecular weight amine.6. The method of claim 4 , wherein the high molecular weight amine is triethylenediamine (TEDA).7. The method of claim 1 , wherein the impregnating solution additionally comprises a non-zinc salt.8. The method of claim 7 , wherein the non-zinc salt is Fe(NO).9. The method of claim 1 , wherein the impregnating solution comprises Cu(NO) claim 1 , CuCl claim 1 , Fe(NO) claim 1 , Al(NO) claim 1 , FeCl claim 1 , FeCl claim 1 , Ca(NO) claim 1 , ZnCl claim 1 , Zinc acetate claim 1 , Copper acetate or combinations thereof.10. The method of further comprising drying the impregnated substrate before heating.11. The method of claim 1 , wherein the impregnated substrate is heated to about 180° C. to about 300° C.12. The method of claim 2 , wherein the method is carried out in one step. This application is a divisional of U.S. Ser. No. 12/941,280 filed on Nov. 8, 2010, now allowed.Activated carbon, alumina, zeolites, and the like, are widely used in filtration appliances. These types of materials are sometimes referred ...
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