Modified polyamines grafted to a particulate, solid support as sorbent materials for removal of target substances from fluids
Provided are compositions for removal of a target substance from a fluid stream, the composition comprising a polyamine; and a covalently linked hydrophobic group, wherein the polyamine is covalently linked to a support material. Also provided are processes for removal of a target substance from a fluid stream comprising contacting the fluid stream with a composition comprising a polyamine; and a covalently linked hydrophobic group, wherein the polyamine is covalently linked to a support material.
1. A composition for removal of a contaminant from an aqueous fluid stream, wherein the composition comprises:
a) a support material which is at least one of porous, solid, and particulate; and
b) a sorbent molecule comprising:
i) a branched polyamine covalently linked to the support material; and
ii) a hydrophobic group covalently linked to the branched polyamine.
2. The composition of claim 1 , wherein the branched polyamine is branched polyethyleneimine (PEI).
3. The composition of claim 2 , wherein the branched PEI has a molecular weight in the range of 500 to 50,000 Da.
4. The composition of claim 1 , wherein the hydrophobic group is a C2-C22 alkyl group.
5. The composition, of claim 1 , wherein the hydrophobic group is selected from the group consisting of:
a butyl; a hexyl; an octyl; an isobutyl; an isohexyl; an isooctyl; a polyfluoro; a perfluoro; a C8 perfluorooctane; and a C8 polyfluorinated 6:2 fluorotelomer.
6. The composition of claim 1 , wherein the sorbent molecule comprises a plurality of hydrophobic groups covalently linked to the branched polyamine.
7. The composition of claim 1 , wherein the composition further comprises the contaminant from an aqueous fluid stream and the contaminant comprises one or more poly- and perfluorinated alkyl substances (PFAS).
8. The composition of claim 7 , wherein the PFAS is a perfluorinated anionic surfactant compound.
9. The composition of claim 7 , wherein the PFAS is selected from the group consisting of:
perfluorobutanesulfonic acid (PFBS); perfluorobutanoic acid (PFBA);
perfluorohexanesulfonic acid (PFHS); perfluorohexanoic acid (PFHA); perfluorooctanoic acid (PFOA); perfluorooctanesulfonic acid (PFOS); perfluorononanoic acid (PFNA); and
perfluorodecanoic acid (PFDA); and 6:2 fluorotelomer sulfonic acid (6:2 FTSA).
10. A method of removing a contaminant from an aqueous fluid stream the method comprising contacting the aqueous fluid stream with a composition comprising:
a) a sorbent molecule comprising:
i) at least a branched polyethylenimine (PEI); and
ii) a hydrophobic group covalently linked to the branched PEI.
11. The method of claim 10 , wherein the branched PEI has a molecular weight in the range of 500 to 50,000 Da.
12. The method of claim 10 , wherein the hydrophobic group comprises a C2-C22 alkyl group.
13. The method of claim 10 , wherein the hydrophobic group comprises a C2-C8 group consisting of a:
butyl; hexyl; octyl; isobutyl; isohexyl; or isooctyl.
14. The method of claim 10 , wherein the hydrophobic group comprises a polyfluoro group or perfluoro group.
15. The method of claim 10 , wherein the hydrophobic group comprises a C8 perfluorooctane or C8 polyfluorinated 6:2 fluorotelomer.
16. The method of claim 10 , wherein the sorbent molecule comprises a plurality of hydrophobic groups covalently linked to the branched PEI.
17. The method of claim 10 , wherein the contaminant comprises one or more poly- and perfluorinated alkyl substance (PFAS).
18. The method of claim 17 , wherein the PFAS is a perfluorinated anionic surfactant compound.
19. The method of claim 17 , wherein the PFAS is selected from the group consisting of:
perfluorobutanesulfonic acid (PFBS); perfluorobutanoic acid (PFBA);
perfluorohexanesulfonic acid (PFHS); perfluorohexanoic acid (PFHA); perfluorooctanoic acid (PFOA); perfluorooctanesulfonic acid (PFOS); perfluorononanoic acid (PFNA); and
perfluorodecanoic acid (PFDA); and 6:2 fluorotelomer sulfonic acid (6:2 FTSA).
20. The method of claim 17 , wherein the method further comprises regenerating the composition after the contacting step.
21. The method of claim 20 , wherein regenerating the composition comprises applying one or more aqueous washes to the composition.
22. The method of claim 20 , wherein the one or more of the aqueous washes is selected from the group consisting of: a salt wash; and acid wash; and a basic wash.