Octamethylcyclotetrasiloxane interacts with lithium ions
View Patent ↗Provided is a method of extracting a metal ion, which comprises contacting a compound of formula (R 2 SiO) n with a source of the metal ion, whereby the compound and the metal ion form a complex, wherein each R is independently C 1-10 alkyl, and n is 3-10.
1. A method of extracting a metal ion from a source, the method comprising:
contacting a compound of formula (R 2 SiO) n with the metal ion in the source, whereby the compound and the metal ion form a complex;
wherein each R is independently selected from C 1-10 alkyl, and n is 4,
wherein the metal ion is a lithium ion, and
wherein the concentration of the metal ion in the source is about 1×10 −6 M to about 1×10 −1 M.
2. The method of claim 1 , wherein the source comprises the metal ion and a counterion selected from the group consisting of F − , Cl − , Br − , I − , HSO4 − , SO 4 2− , HCO 3 − , CO 3 2− , B(OH) 4 − , B 2 O 5 4− , B 3 O 7 5− , B 4 O 9 6− , NO 3 − , H 2 PO 4 − , HPO 4 2− , PO 4 3− , and combinations thereof.
3. The method of claim 1 , wherein the compound is of formula (I):
wherein each R 1 is independently selected from C 1-4 alkyl.
4. The method of claim 1 , wherein the R 1 groups are the same.
5. The method of claim 1 , wherein the compound is
6. The method of claim 1 , wherein the source of the metal ion comprises an aqueous solution.
7. The method of claim 1 , wherein the source of the metal ion comprises seawater.
8. The method of claim 1 , wherein the pH of the source of the metal ion is 1 to 12.
9. The method of claim 1 , wherein the pH of the source of the metal ion is 2 to 4.
10. The method of claim 1 , further comprising pre-treating the source of the metal ion before contacting the compound of formula (I) with the source.
11. The method of claim 1 , further comprising isolating the metal ion from the complex.
12. The method of claim 1 , further comprising distilling the compound.
13. The method of claim 1 , wherein the concentration of the metal ion in the source is about 1×10 −5 M to about 1×10 −1 M.
14. The method of claim 1 , wherein the concentration of the metal ion in the source is about 1×10 −5 M to about 1×10 −3 M.
15. The method of claim 1 , wherein the concentration of the metal ion in the source is about 1×10 −5 M to about 1×10 −4 M.
16. The method of claim 1 , wherein the volume ratio between the compound and the source of the metal ion is about 1:100 to about 1:1.
17. The method of claim 1 , wherein the volume ratio is about 1:50 to about 1:5.
18. The method of claim 1 , wherein the volume ratio is about 1:50 to about 1:10.
19. A method of extracting lithium ion from a source, the method comprising:
contacting octamethylcyclotetrasiloxane with the lithium ion in the source, whereby the octamethylcyclotetrasiloxane and the lithium ion form a complex,
wherein the source comprises brine or seawater.