Ultramicro to mesopore frameworks for selective separation and storage of noble gases
Methods and materials for the selective capture and storage of preselected materials from gas streams using metal organic framework (MOF) materials are described. In various embodiments preselected target material gases could include noble gasses such as Kr, Xe, Rn, Arultramicro to mesopore frameworks for selective separation and storage of noble gases, other gasses such as I 2 or other particular isotopes either naturally occurring or man-made, or another preselected gas capture material such as a target material for legal, regulatory or treaty compliance, or a preselected material from a particular process such as a cleaning or etching agent from semiconducting or microelectronic manufacture, or a portion of an anesthetic gas such as nitrous oxide, isoflurane, sevoflurane or a fluorinated ethers.
1. A method for capturing a preselected target material gas from a mixed stream comprising the steps of:
passing at least a portion of a mixed stream over a capture material containing a material selected from the group consisting of M-ATC, MPyCar, M-SDB, CROFOUR-1-Ni, CROFOUR-2-Ni, PCN-12, MOF-74 series, porous organic cage compounds, and SIFSIX derivatives, wherein the pre-selected target material is Tritium.
2. The method of claim 1 wherein the preselected target material includes Xe.
3. The method of claim 1 wherein the preselected target material includes Kr.
4. The method of claim 1 wherein the preselected target material includes Rn.
5. The method of claim 1 wherein the preselected target material includes Ar.
6. The method of claim 1 wherein the preselected target materials includes a noble gas.
7. The method of claim 1 wherein the pre-selected target material includes Iodine.
8. The method of claim 1 wherein the mixed stream is an anaesthetic gas mixture containing Xe.
9. The method of claim 1 wherein the mixed stream is an anaesthetic gas mixture containing nitrous oxide.
10. The method of claim 1 wherein the mixed stream is an anaesthetic gas mixture containing at least one material selected from the group consisting of isoflurane, sevoflurane, fluorinated ethers and combinations thereof.
11. The method of claim 1 wherein the mixed stream is an off-gas from semiconductor/microelectronic manufacturing.
12. The method of claim 1 wherein the preselected target material includes a radioactive isotope.
13. The method of claim 1 wherein the mixed stream is an off gas from isotope production.
14. The method of claim 1 wherein the mixed stream is a gas.
15. The method of claim 14 wherein the gas is air.
16. The method of claim 1 wherein the mixed stream is a liquid.
17. The method of claim 16 wherein the liquid is aqueous.
18. The method of claim 17 wherein the preselected target material includes Iodine, methyl iodide or derivatives therefrom.
19. The method of claim 1 wherein the method further comprises the step of passing the mixed stream over a first bed comprising a metal organic framework (MOF) material having an interconnected pore size ranging from 0.35 nm to 0.2 nm selected from the group consisting of M-ATC, M-PyCar, M-SDB, CROFOUR-1-Ni, CROFOUR-2-Ni, PCN-12, M-TCPB and M-hfbba, to generate a filtered gas and then passing said filtered gas over a second bed having a metal organic framework (MOF) material.