초록 ▼

A filter for removing contaminants from air. The filter includes (a) a substrate that does not have any volatile ammonia on the surface thereof; (b) copper that has been impregnated onto the substrate; and (c) molybdenum and/or tungsten that has been impregnated onto the substrate. The filter can be

A filter for removing contaminants from air. The filter includes (a) a substrate that does not have any volatile ammonia on the surface thereof; (b) copper that has been impregnated onto the substrate; and (c) molybdenum and/or tungsten that has been impregnated onto the substrate. The filter can be made using an aqueous solution(s) that contains one or more of a first copper salt and a second salt that include a polynuclear anion that contains molybdenum, tungsten, or both. Because the metals can be impregnated onto the substrate surface without using an ammonium-based solution, the need to manage ammonia off-gassing is avoided. Further, no volatile ammonia would be present on the resulting substrate surface.

대표청구항 ▼

1. A method of making an air filter, which method comprises: (a) providing an aqueous solution that contains one or more of a first water soluble copper salt and that has a pH less than 8;(b) providing an aqueous solution that contains one or more of a second water soluble salt that includes a polyn

1. A method of making an air filter, which method comprises: (a) providing an aqueous solution that contains one or more of a first water soluble copper salt and that has a pH less than 8;(b) providing an aqueous solution that contains one or more of a second water soluble salt that includes a polynuclear anion that contains molybdenum, tungsten, or a combination thereof, which aqueous solution has a pH less than 8;wherein the aqueous solution that contains the first water soluble copper salt may be the same or different from the aqueous solution that contains the second salt; and(c) contacting a substrate with the one or more of the aqueous solutions such that (1) copper and (2) molybdenum or tungsten or a combination thereof become impregnated onto the substrate. 2. The method of claim 1, further comprising (d) heating the contacted substrate. 3. The method of claim 2, wherein the substrate is heated to at least about 80 degrees Celsius. 4. The method of claim 3, where in the substrate is heated in an inert atmosphere. 5. The method of claim 1, wherein the water soluble copper salt is copper nitrate. 6. The method of claim 5, wherein the second salt comprises phosphomolybdate anion. 7. The method of claim 5, wherein the second salt comprises silicomolybdate anion. 8. The method of claim 5, wherein the second salt comprises phosphotungstate anion. 9. The method of claim 5, wherein the second salt comprises silicotungstate anion. 10. The method of claim 6, wherein no ammoniacal solution or ammonium salt is used to impregnate copper, molybdenum, or tungsten onto the substrate. 11. The method of claim 1, wherein the solution that contains the one or more first copper salt is substantially free of a copper ammine complex. 12. The method of claim 1, wherein the pH of the aqueous solution(s) is less than 7. 13. The method of claim 1, wherein the first or second solution contains nitric acid. 14. The method of claim 1, wherein the substrate comprises activated carbon.