Perfluoroalkyl and polyfluoroalkyl sorbent materials and methods of use
AssigneeCalgon Carbon Corporation
InventorsRebecca L. DISTEFANO, Richard A. MIMNA
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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.
Claims11
-13. (canceled)
A method for reactivating spent activated carbon, the process comprising:
- providing spent activated carbon that has been previously used for water filtration, wherein the spent activated carbon comprises one or more of an ion, oxide, or carbonate of one or more of calcium, magnesium, sodium, potassium, and zinc;
- and
- forming reactivated carbon by heating the spent activated carbon at a temperature above about 550° C. in the presence of steam,
- wherein the reactivated carbon retains the ion, oxide, or carbonate of calcium, magnesium, sodium, potassium, and zinc.
Dependencies are inferred from the claim text.