Removal of chloramine and mercury from aqueous solutions

Patent metadata

Field	Value
Publication number	US-2016016819-A1
Application number	US-201414773449-A
Country	US
Kind code	A1
Filing date	Mar 3, 2014
Priority date	Mar 12, 2013
Publication date	Jan 21, 2016
Grant date	—

Abstract

Described herein is a method of removing mercury from an aqueous solution comprising: providing an aqueous solution comprising chloramine and mercury; and contacting the aqueous solution with a medium comprising a porous carbon substrate comprising at least 1.5% by mass of sulfur.

First claim

1 . A method of removing chloramine and mercury from an aqueous solution comprising:
providing an aqueous solution comprising chloramine and mercury; and contacting the aqueous solution with a medium comprising a porous carbon substrate, wherein the porous carbon substrate comprises at least 1.5% by mass of sulfur.

2 . The method of claim 1 , wherein the porous carbon substrate is predominately microporous.

3 . The method of claim 1 , wherein the surface of the porous carbon substrate comprises a species of CO x S y , wherein x is no more than 0.1, and y is 0.005 to 0.3.

4 . The method of claim 1 , wherein the porous carbon substrate further comprises nitrogen and the sum of the sulfur and nitrogen is at least 4.0% by mass.

5 . The method of claim 1 , wherein the porous carbon substrate is an activated carbon.

6 . The method of claim 1 , wherein at least 0.2% by mass of the medium comprises sulfur in an oxidation state higher than 0 based on XPS surface analysis.

7 . The method of claim 1 , wherein the medium has a bulk density of greater than 0.6 g/cc.

8 . The method of claim 1 , wherein the medium has an ash content less than 3%.

9 . A method of removing organic compounds from an aqueous solution comprising:
contacting an aqueous solution comprising at least 0.5 ppm of chloramine and mercury with a medium comprising a porous carbon substrate having at least 1.5% by mass of sulfur and collecting the eluate, wherein the eluate comprises less than 0.1 ppm of chloramine.

10 . A method comprising:
providing a medium prepared by thermal treatment of (i) the surface of a carbon support and (ii) a reactant compound comprising sulfur; and contacting the medium with an aqueous solution comprising chloramine and mercury, wherein after contact with the medium, the aqueous solution has a decreased amount of chloramine and a decreased amount of the mercury.

11 . The method of claim 1 , wherein the medium is disposed within a matrix, wherein the matrix is a polymer matrix.

12 . The method of claim 11 , wherein the medium further comprises particles comprising titanium.

13 . The method of claim 10 , wherein the thermal reaction product further comprises (iii) a reactant compound comprising nitrogen.

14 . The method of claim 10 , wherein the reactant compound comprising sulfur is selected from at least one of: elemental sulfur, sulfur oxides, hydrogen sulfide, salts containing oxyanions of sulfur, and combinations thereof.

15 . The method of claim 10 , wherein the thermal treatment is conducted at a temperature greater than 445° C. in an inert atmosphere.

16 . The method of claim 10 , wherein the amount of chloramine is decreased by at least 80% when challenged with a solution comprising 3 ppm chloramine.

17 . The method of claim 10 , wherein the amount of mercury is decreased by at least 60% when challenged with a solution comprising 6 ppb mercury.

Assignees

• 3M Innovative Properties Co

Inventors

• Stouffer Mark R
• Doyle Meredith M
• Moreno Angela M
• Pemberton Eric C
• Siedle Allen R

Classifications

• C02F1/283 Primary

  using coal, charred products, or inorganic mixtures containing them · CPC title

• C02F2101/12

  Halogens or halogen-containing compounds · CPC title

• C02F1/288

  using composite sorbents, e.g. coated, impregnated, multi-layered · CPC title

• B01J20/28011

  Other properties, e.g. density, crush strength · CPC title

• C02F2303/185

  The treatment agent being halogen or a halogenated compound · CPC title