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A method for extracting a metal species from a solution is described, where the metal species comprises a rare earth element, Th, or U. The method involves the use of poly(caffeic acid) as a sorbent material. The poly(caffeic acid) may be crosslinked with a diamine crosslinker such as ethylenediamine.

Titel:	Environmentally Friendly Polymeric Sorbent Material for the Extraction and Determination of Rare Earth Elements, Thorium, and Uranium
Link:	Zum Volltext
Veröffentlichung:	2024
Medientyp:	Patent
Sonstiges:	Nachgewiesen in: USPTO Patent Applications Sprachen: English Document Number: 20240050924 Publication Date: February 15, 2024 Appl. No: 18/227497 Application Filed: July 28, 2023 Assignees: The University of Toledo (Toledo, OH, US) Claim: 1. A method for extracting a metal from a solution, the method comprising: dispersing a sorbent material in an aqueous solution containing a metal species to form a dispersed solution in which the metal species coordinates with the sorbent material; and removing the sorbent material from the dispersed solution to extract the metal species from the aqueous solution; wherein the sorbent material comprises poly(caffeic acid); and wherein the metal species comprises a rare earth element, Th, or U. Claim: 2. The method of claim 1, wherein the poly(caffeic acid) has a diamine crosslinker. Claim: 3. The method of claim 1, wherein the poly(caffeic acid) has an ethylenediamine crosslinker. Claim: 4. The method of claim 1, wherein the sorbent material comprises Formula I: [chemical expression included] Claim: 5. The method of claim 1, wherein the sorbent material is dispersed in the aqueous solution without a support. Claim: 6. The method of claim 1, wherein the sorbent material is bound to a support. Claim: 7. The method of claim 1, wherein the sorbent material is not bound to a support. Claim: 8. The method of claim 1, wherein the metal species includes one or more of La, Ce, Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, Lu, Th, and U. Claim: 9. The method of claim 1, wherein the aqueous solution comprises a plurality of rare earth elements, and each of the plurality of rare earth elements is extracted by the sorbent material. Claim: 10. The method of claim 1, wherein the dispersing comprises mixing the sorbent material in the aqueous solution with ultra-sonication for a period of time. Claim: 11. The method of claim 1, wherein the aqueous solution has a pH ranging from 2.0 to 6.0. Claim: 12. The method of claim 1, wherein the dispersing is conducted at room temperature. Claim: 13. The method of claim 1, wherein the removing comprises filtering the dispersed solution to separate the sorbent material from the dispersed solution. Claim: 14. The method of claim 13, further comprising analyzing a filtrate from the filtering to determine a percent removal of the metal species. Claim: 15. The method of claim 1, further comprising washing the removed sorbent material with a desorption solvent to desorb the metal species from the sorbent material. Claim: 16. The method of claim 15, further comprising collecting the desorption solvent after the washing and analyzing the collected desorption solvent to determine a percent recovery of the metal species. Claim: 17. The method of claim 15, further comprising re-using the sorbent material for a further extraction of rare earth elements, Th, or U. Claim: 18. The method of claim 1, wherein the aqueous solution further comprises one or more non-rare earth metal ion species. Claim: 19. A composition comprising poly(caffeic acid) dispersed in an aqueous solution containing a metal species comprising a rare earth element, Th, or U. Claim: 20. The composition of claim 19, wherein the poly(caffeic acid) is crosslinked with a diamine. Current International Class: 01; 08; 01; 22; 22; 22

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Environmentally Friendly Polymeric Sorbent Material for the Extraction and Determination of Rare Earth Elements, Thorium, and Uranium