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US 2020/0047114 A1Published application
Gas separation membrane containing metal-organic frameworks and methods of making thereof
AssigneesKing Fahd University of Petroleum and Minerals, King Abdulaziz City for Science and Technology
InventorsBassem AL-MAYTHALONY, Muhammad Usman
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Abstract
A membrane including a polymer substrate having pore channels and a metal-organic framework disposed on the polymer substrate. Methods of producing the membrane are described. Methods of separating gases using the membrane are also provided.
Claims20
1:
- A membrane, comprising:
- a polymer substrate having pore channels;
- and
- a metal-organic framework comprising a metal ion and an organic ligand coordinated to the metal ion;
- wherein:
- the pore channels have an average diameter of 0.1-2 μm and an average length of 2-100 μm;
- the metal-organic framework is disposed on a wall surface of the pore channels and an outer surface of the polymer substrate;
- and
- the metal-organic framework is present at an amount of 0.1-50 wt % relative to a total weight of the membrane.
6 more elements
2:
- The membrane of claim 1, wherein the metal-organic framework has an average thickness of 100-2,000 nm.
3:
- The membrane of claim 1, wherein the metal ion is an ion of at least one metal selected from the group consisting of a transition metal, a post-transition metal, and an alkaline earth metal.
4:
- The membrane of claim 1, wherein the polymer substrate comprises at least one polyester selected from the group consisting of poly(ethylene terephthalate), poly(trimethylene terephthalate), poly(butylene terephthalate), poly(ethylene naphthalate), and poly(cyclohexylenedimethylene terephthalate).
5:
- The membrane of claim 1, wherein the wall surface of the pore channels and the outer surface of the polymer substrate are modified with carboxylate groups.
6:
- The membrane of claim 4, wherein the polymer substrate comprises poly(ethylene terephthalate).
7:
- The membrane of claim 1, wherein the organic ligand has at least two carboxylate groups.
8:
- The membrane of claim 7, wherein the organic ligand is benzene-1,3,5-tricarboxylate.
9:
- The membrane of claim 3, wherein the metal ion is an ion of at least one metal selected from the group consisting of Cu, Zn, Fe, Ni, Co, Mn, Cr, Cd, Mg, Ca, and Zr.
10:
- The membrane of claim 1, wherein the metal-organic framework comprises HKUST-1.
11:
- The membrane of claim 1, which has an ultraviolet visible absorption with an absorption peak of 500-800 nm.
12:
- The membrane of claim 1, which has a BET surface area of 100-500 m2/g.
13:
- A method of producing the membrane of claim 5, the method comprising:
- ion-irradiating a polymer substrate with heavy ions to form a polymer substrate having latent tracks;
- exposing the polymer substrate having latent tracks to a light to form a sensitized polymer substrate;
- etching the sensitized polymer substrate with an etchant to form a polymer substrate having pore channels;
- immersing the polymer substrate having pore channels in a first solution comprising the metal ion to form a metal ion coated polymer substrate;
- immersing the metal ion coated polymer substrate in a second solution comprising the organic ligand to form a metal-organic framework coated polymer substrate;
- and
- alternating immersions in the first solution and the second solution for up to 200 cycles, thereby forming the membrane;
- wherein:
- the pore channels have an average diameter of 0.1-2 μm and an average length of 2-100 μm;
- and
- the wall surface of the pore channels and the outer surface of the polymer substrate having pore channels are modified with carboxylate groups.
9 more elements
14:
- The method of claim 13, wherein the heavy ions have a fluence of 103-1010 heavy ions per square centimeter and an average kinetic energy of 5-25 MeV per nucleon.
15:
- The method of claim 13, wherein the metal ion is present in the first solution at a concentration of 0.01-100 mM and the organic ligand is present in the second solution at a concentration of 0.01-100 mM.
16:
- The method of claim 13, wherein immersing the polymer substrate having pore channels in the first solution comprising the metal ion is performed at a temperature of 4-60° C. for 1-60 min per cycle.
17:
- The method of claim 13, wherein immersing the metal ion coated polymer substrate in the second solution comprising the organic ligand is performed at a temperature of 4-60° C. for 1-60 min per cycle.
18:
- The method of claim 13, wherein the etchant is a solution comprising sodium hydroxide at a concentration of 0.5-5 M.
19:
- A method of recovering a first gas from a gas mixture comprising the first gas and a second gas, the method comprising:
- delivering the gas mixture into a feed side of a chamber comprising the membrane of claim 1 that divides the chamber into the feed side and a permeate side, such that at least a portion of the first gas permeates the membrane;
- and
- recovering from the permeate side a stream enriched in the first gas compared to the gas mixture.
1 more element
20:
- The method of claim 19, wherein the first gas is hydrogen, carbon dioxide, or both, and the second gas is at least one selected from the group consisting of oxygen, nitrogen, methane, ethylene, ethane, propylene, and propane.