Filtration medium comprising a thermolysis product of a carbon oxychalcogenide and a metal salt, method of removing chloramine with this filtration medium and method of making this filtration medium
View Patent ↗Described herein is a filtration medium comprising a substrate, wherein the substrate comprises a thermolysis product of (i) a carbon substrate having a surface of CO x E y , wherein E is selected from at least one of S, Se, and Te; and wherein x and y are greater than 0; and (ii) a metal salt; and methods of removing chloramine 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 thermolysis product of (a) a carbon substrate having a surface comprising CO x E y wherein E is selected from at least one of S, Se, and Te wherein x and y are greater than 0 and (b) a metal salt, wherein the metal comprises at least one of copper, iron, silver, and manganese.
2. The method of claim 1 , wherein the metal salt comprises (i) a metal carboxylate; (ii) nitrogen-containing oxyanion metal salt; (iii) a sulfur-containing anion metal salt; (iv) a metal chloride; (v) a metal phosphate; or (vi) combinations thereof.
3. The method of claim 1 , wherein x is no more than 0.1, and y is 0.005 to 0.3.
4. The method of claim 1 , wherein x is 0.01 to 0.1.
5. The method of claim 1 , wherein the composition comprises less than 0.90, mass % nitrogen based on the total mass of the composition.
6. The method of claim 1 , wherein the composition comprises greater than 2.0 mass % sulfur based on the total mass of the composition.
7. The method of claim 1 , wherein the composition comprises greater than 4.0 mass % sulfur based on the total mass of the composition.
8. The method of claim 2 , wherein the sulfur-containing anions metal salt comprises a sulfate, sulfamate, sulfite, bisulfate, bisulfite, thiosulfate, or combinations thereof.
9. The method of claim 2 , wherein the metal carboxylate comprises an oxalate, an acetate, a citrate, or combinations thereof.
10. The method of claim 1 , wherein E is sulfur and the sulfur is chemically combined with carbon.
11. The method of claim 1 , wherein the composition comprises less than 0.70, mass % nitrogen based on the total mass of the composition.
12. The method of claim 1 , wherein the composition comprises less than 0.30, mass % hydrogen based on the total mass of the composition.