Filtration medium comprising a metal-containing particulate
View Patent ↗Described herein is a liquid filtration device is disclosed comprising a fluid conduit fluidly connecting a fluid inlet to a fluid outlet; and a water filtration medium disposed in the fluid conduit; the water filter medium comprising a metal-containing particulate, wherein the metal-containing particulate comprises a thermolysis product of a metal salt wherein the salt is selected from nitrogen-containing oxyanions, sulfur-containing anions, chlorides, phosphates, and combinations thereof; and methods of removing chloramines from aqueous solutions.
1. A method for removing chloramine from aqueous solutions comprising: providing an aqueous solution comprising chloramine and contacting the aqueous solution with a composition comprising a metal-containing particulate, wherein the metal-containing particulate comprises a thermolysis product of a metal salt, wherein the salt is selected from nitrogen-containing oxyanions, sulfur-containing anions, chlorides, phosphates, and combinations thereof.
2. The method of claim 1 , wherein the nitrogen-containing oxyanions comprise a nitrate, a nitrite, and combinations thereof.
3. The method of claim 1 , wherein the sulfur-containing anions comprise a sulfate, sulfamate, sulfite, bisulfate, bisulfate, thiosulfate, and combinations thereof.
4. The method of claim 1 , wherein the metal-containing particulate is substantially free of sulfur atoms.
5. The method of claim 1 , wherein the metal-containing particulate comprises a sulfur atom and the sulfur atom is derived from the sulfur-containing anion.
6. The method of claim 1 , wherein the metal of the metal salt is copper, iron, manganese, silver, and combinations thereof.
7. The method of claim 1 , wherein the thermolysis product is disposed on the surface of a support.
8. The method of claim 7 , wherein the support is selected from a carbonaceous solid, an inorganic oxide particle, or a fibrous particle.
9. The method of claim 7 , wherein the support is an activated carbon.
10. The method of claim 1 , wherein the thermolysis product of a metal salt is immobilized in a fluid conduit.
11. The method of claim 1 , wherein the metal-containing particulate is porous.
12. The method of claim 1 , wherein the metal-containing particulate comprises less than 0.90, mass % nitrogen based on the total mass of the metal-containing particulate.
13. The method of claim 1 , wherein the metal-containing particulate comprises greater than 2.0 mass % sulfur based on the total mass of the metal-containing particulate.
14. The method of claim 1 , wherein after contacting the aqueous solution with a composition comprising a metal-containing particulate, the resulting aqueous solution comprises a reduced amount of chloramine.
15. A method for removing chloramine from aqueous solutions comprising:
heating a metal salt wherein the salt is selected from nitrogen-containing oxyanions, sulfur-containing anions, chlorides, phosphates, and combinations thereof to form a thermolysis product;
cooling the thermolysis product; and
contacting the cooled thermolysis product with an aqueous solution comprising chloramine.