IP Library › Granted Patent US 12,478,948
Granted Patent B2
US 12,478,948 · App. 18/442,503 · Granted Nov 25, 2025

Perfluoroalkyl and polyfluoroalkyl sorbent materials and methods of use

Inventors: Rebecca L. Distefano (Oakdale, PA); Richard A. Mimna (Oakdale, PA)
Assignee: CALGON CARBON CORPORATION
B01J20/20B01D53/02B01J20/041B01J20/3028C02F1/283C02F2101/36
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Quick Facts
Patent No.
US 12,478,948
App. No.
18/442,503
Granted
Nov 25, 2025
Kind
B2
Abstract

Sorbent materials that are treated with ions, salts, oxides, hydroxides, or carbonates of calcium, magnesium, strontium, or barium are useful in removing perfluoroalkyl and polyfluoroalkyl substances (PFAS), perfluorooctanoic acid (PFOA), perfluorooctanesulfonic acid (PFOS), 2,3,3,3,-tetrafluoro-2-(heptafluoropropoxy)propanoate and heptafluoropropyl 1,2,2,2-tetrafluoroethyl ether, and similar compounds from liquids and gases are disclosed. The sorbent materials with the disclosed treatments offer improved performance as measured against untreated sorbent materials.

Claims (7)

1 . A method of removing perfluoroalkyl and polyfluoroalkyl substances (PFAS) from liquid or gas, the method comprising:

providing a sorbent material comprising reactivated carbon, wherein the reactivated carbon is formed from a spent activated carbon, wherein the spent activated carbon was previously used for water filtration; and

contacting the sorbent material with a liquid or gas containing the PFAS wherein the reactivated carbon was reactivated by heat at a temperature of about 500° C. to about 1100° C..

2 . The method of claim 1 , wherein the reactivated carbon was reactivated by heat at a temperature of about 700° C.

3 . The method of claim 1 , wherein the reactivated carbon is formed from spent sorbent material feedstock comprising calcium carbonate.

4 . The method of claim 1 , wherein the reactivated carbon comprises one or more of granular activated carbon and powdered activated carbon.

5 . The method of claim 1 , wherein the spent activated carbon is not treated to remove any inorganic materials that are present in ground water.

Assignments (2)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded May 26, 2024
From: DISTEFANO, REBECCA L.
To: CALGON CARBON CORPORATION
Reel/Frame 067532/0948 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded May 26, 2024
From: MIMNA, RICHARD A.
To: CALGON CARBON CORPORATION
Reel/Frame 067532/0953 →
Continuity (3)
Continuation 16839862 · Apr 3, 2020
Provisional Application 62828790 · Apr 3, 2019
Related Publication 20240246059A1 · Jul 25, 2024
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