Activated carbon supported Ni
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 ).
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.