Filtration medium comprising a metal-containing particulate

Patent metadata

Field	Value
Publication number	US-9446328-B2
Application number	US-201214362029-A
Country	US
Kind code	B2
Filing date	Dec 13, 2012
Priority date	Dec 22, 2011
Publication date	Sep 20, 2016
Grant date	Sep 20, 2016

Abstract

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.

First claim

What is claimed is:

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.

Assignees

• 3M Innovative Properties Co

Inventors

• Stouffer Mark R
• Doyle Meredith Mcmurdo
• Siedle Allen R
• Wood Thomas E

Classifications

• B01J20/0292

  Phosphates of compounds other than those provided for in B01J20/048 · CPC title

• C02F1/281

  using inorganic sorbents · CPC title

• B01J20/0281

  Sulfates of compounds other than those provided for in B01J20/045 · CPC title

• B01J20/0222

  Compounds of Mn, Re · CPC title

• B01J20/0285

  Sulfides of compounds other than those provided for in B01J20/045 · CPC title