Activated carbon supported Ni0Fe0 nanoparticles for reductive transformation of perfluoroalkyl-containing compounds

Patent metadata

Field	Value
Publication number	US-11045676-B2
Application number	US-201816056646-A
Country	US
Kind code	B2
Filing date	Aug 7, 2018
Priority date	Aug 25, 2017
Publication date	Jun 29, 2021
Grant date	Jun 29, 2021

Abstract

The present application relates to a novel method for reductive degradation of perfluoroalkyl-containing compounds, such as perfluoroalkyl sulfonates, by activated carbon (AC) supported zero valent iron-nickel nanoparticles (nNi 0 Fe 0 ).

First claim

We claim:

1. A method of degradation of one or more perfluoroalkyl-containing compound, wherein the method comprises:
providing a mixture comprising one or more perfluoroalkyl-containing compound, wherein the perfluoroalkyl-containing compound is branched or straight chain perfluoroalkyl-containing sulfonate;
providing particles comprising zero valent iron (Fe 0 ) and zero valent nickel (Ni 0 ) to the mixture, wherein said zero valent iron (Fe 0 ) comprises Fe 0 nanoparticles, wherein the surface of Fe 0 nanoparticles is coated with zero valent nickel (Ni 0 ); and wherein zero valent iron (Fe 0 ) and zero valent nickel (Ni 0 ) are supported by active carbon powders, and
degrading the perfluoroalkyl-containing compound in the mixture, wherein the degradation involves cleavage of the sulfonate group and defluorination of said branched or straight chain perfluoroalkyl-containing sulfonate to provide inorganic sulfate,
wherein the degradation is carried out between 25-100° C.

2. The method of claim 1 , wherein the zero valent iron (Fe 0 ) comprises Fe 0 nanoparticles, and wherein the surface of Fe 0 nanoparticles is plated with zero valent nickel (Ni 0 ).

3. The method of claim 1 , wherein the weight percentage of the zero valent nickel (Ni 0 ) is 0.1% to 15% of the total weight of zero valent iron (Fe 0 ) and zero valent nickel (Ni 0 ).

4. The method of claim 3 , wherein the weight percentage of the zero valent nickel (Ni 0 ) is 0.5% to 5% of the total weight of zero valent iron (Fe 0 ) and zero valent nickel (Ni 0 ).

5. The method of claim 1 , wherein the weight percentage of active carbon powders is 1% to 30% of the total weight of zero valent iron (Fe 0 ), zero valent nickel (Ni 0 ), and active carbon powders.

6. The method of claim 5 , wherein the weight percentage of active carbon powders is 5% to 20% of the total weight of zero valent iron (Fe 0 ), zero valent nickel (Ni 0 ), and active carbon powders.

7. The method of claim 1 , wherein the degradation is carried out between 45-80° C.

8. The method of claim 1 , wherein the degradation is carried out for in-situ groundwater remediation.

9. The method of claim 1 , wherein the perfluoroalkyl-containing compound comprises branched or straight chain perfluorooctane sulfonate (PFOS).

10. The method of claim 1 , wherein at least 20% of the total amount of the original perfluoroalkyl-containing compound is degraded.

Assignees

• Purdue Research Foundation

Inventors

• Lee Linda S
• Zenobio Jenny E

Classifications

• C02F2305/08

  Nanoparticles or nanotubes · CPC title

• B09C1/06

  thermally · CPC title

• B09C1/08

  chemically · CPC title

• B09C1/002

  involving in-situ ground water treatment · CPC title

• A62D3/37

  by reduction, e.g. hydrogenation · CPC title