Copper and nitrogen treated sorbent and method for making same

Patent metadata

Field	Value
Publication number	US-2022062862-A1
Application number	US-202117446532-A
Country	US
Kind code	A1
Filing date	Aug 31, 2021
Priority date	Aug 31, 2020
Publication date	Mar 3, 2022
Grant date	—

Abstract

Carbonaceous material that is activated to form precursor activated carbon is further enhanced by doping with copper and nitrogen and calcining. The resultant sorbent material has excellent catalytic properties which are useful in the field of fluid purification.

First claim

1 . A method of manufacturing a sorbent material, the method comprising:
providing a carbonaceous material; activating the carbonaceous material to form a precursor activated carbon; doping the precursor activated carbon by contacting the precursor activated carbon with an copper source and a nitrogen source to thereby form a doped precursor activated carbon; calcining the doped precursor activated carbon in a calcining atmosphere that does not cause any substantial oxidation or activation of the doped precursor activated carbon to thereby form a sorbent material.

2 . The method of claim 1 , wherein the copper source is selected from copper sulfate pentahydrate, CuSO 4 .5H 2 O, or copper (II) carbonate hydroxide, CuCO 3 (OH) 2 , and the nitrogen source is one or more of urea, CO(NH 2 ) 2 , ammonium carbonate, (NH 4 ) 2 CO 3 , or aqueous ammonium hydroxide, NH 4 OH (nominally aq, 28wt. %).

3 . The method of claim 2 , wherein the copper source is selected from copper sulfate pentahydrate, CuSO 4 .5H 2 O, and the nitrogen source is of urea, CO(NH 2 ) 2 .

4 . The method of claim 2 , wherein the copper source is copper (II) carbonate hydroxide, CuCO 3 (OH) 2 , and the nitrogen source is one or more of urea, CO(NH 2 ) 2 , ammonium carbonate, (NH 4 ) 2 CO 3 , or aqueous ammonium hydroxide, NH 4 OH (nominally aq, 28 wt. %).

5 . The method of claim 1 , wherein calcining is performed at a temperature of about 850° C. to about 1050° C. in a N 2 atmosphere.

6 . The method of claim 1 , wherein the oxidizing is required and is performed.

7 . The method of claim 1 , wherein doping the precursor activated carbon is performed in a single stage process, the single stage process including a single step of contacting the precursor activated carbon with both a copper source and a nitrogen source.

8 . The method of claim 5 , wherein contacting the precursor activated carbon with the copper source and the nitrogen source is performed with a single aqueous solution that contains both the copper source and the nitrogen source.

9 . The method of claim 6 , wherein the precursor activated carbon is dried after it is contacted with the single aqueous solution containing the copper source and the nitrogen source.

10 . The method of claim 1 , wherein calcining is performed at a temperature of about 600° C. to about 1000° C. in a N 2 atmosphere.

11 . The method of claim 1 , wherein calcining is performed at a temperature of about 700° C. to about 1000° C. in a N 2 atmosphere.

12 . The method of claim 1 , wherein calcining is performed at a temperature of about 850° C. to about 1000° C. in a N 2 atmosphere.

13 . The method of claim 1 , further comprising oxidizing the precursor activated carbon prior to doping.

14 . The method of claim 1 , further comprising oxidizing the precursor activated carbon prior to doping.

15 . A method of removing chlorine, chloramine, or both chlorine and chloramine from a fluid, the method comprising:
providing a sorbent material comprising an activated carbon doped with copper and nitrogen, and contacting the sorbent material with the fluid.

16 . The method of claim 15 , wherein the fluid is liquid water.

17 . The method of claim 15 , wherein the water or the sorbent material has previously undergone a disinfecting step.

18 . The method of claim 15 , wherein the sorbent material is formed from a carbonaceous material that is activated to form a precursor activated carbon, and the sorbent material comprises about 2 wt. % to about 15 wt. % nitrogen as measured on a dry precursor activated carbon basis; about 0.25 wt. % to about 2 wt. % copper as measured on a dry precursor activated carbon basis; and wherein the sorbent material has a chloramine destruction number (CDN) of at least about 6.

19 . A sorbent material formed from a carbonaceous material that is activated to form a precursor activated carbon, the sorbent material comprising:
about 2 wt. % to about 15 wt. % nitrogen as measured on a dry precursor activated carbon basis; about 0.25 wt. % to about 2 wt. % copper as measured on a dry precursor activated carbon basis; wherein the sorbent material has a chloramine destruction number (CDN) of at least about 6.

20 . The sorbent material of claim 19 , wherein the CDN is about 6 to about 60.

21 . The sorbent material of claim 19 , wherein the sorbent material is formed from a carbonaceous material that is formed from one or more of coal, wood, and coconut.

22 . The sorbent material of claim 21 , wherein at least part of the carbonaceous material is formed from coconut.

Assignees

• Calgon Carbon Corp

Inventors

• Mazzoccoli Jason P
• Walker Ryan W
• Tramposch Walter G

Classifications

• B01J2220/4825

  Polysaccharides or cellulose materials, e.g. starch, chitin, sawdust, wood, straw, cotton · CPC title

• B01J20/06

  comprising oxides or hydroxides of metals not provided for in group B01J20/04 · CPC title

• B01J20/02 Primary

  comprising inorganic material · CPC title

• B01J20/0237

  Compounds of Cu · CPC title

• B01J20/3085

  Chemical treatments not covered by groups B01J20/3007 - B01J20/3078 · CPC title