Metal organic framework membranes
AssigneesMonash University, Commonwealth Scientific and Industrial Research Oganisation, Board of Regents, The University of Texas System
InventorsHuanting Wang, Huacheng Zhang, Xingya Li, Jun Lu, Benny Freeman, Anita Joyce Hill
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Abstract
Disclosed herein is an ion selective separation membrane including: a metal organic framework layer formed on, in, and/or around a substrate, the metal organic framework having a crystal structure that includes a first surface and a second surface and includes ion transport channels formed between respective pore windows in the first surface and the second surface; first and second electrodes to apply a potential difference across the membrane; wherein the respective pore windows have a pore size that is less than the hydrated diameter of the ion for which the ion selective separation membrane is selective.
Claims23
An ion selective separation membrane comprising:
- a metal organic framework layer formed on, in, and/or around a substrate, the metal organic framework having a crystal structure that includes a first surface and a second surface and includes ion transport channels formed between respective pore windows in the first surface and the second surface, wherein the substrate is a porous substrate having a plurality of channels, and the metal organic framework layer is formed as a plug of metal-organic framework material within each of the channels of the substrate, wherein the channels of the substrate taper from a first diameter at a first surface of the substrate to a second diameter at a second surface of the substrate, wherein the first diameter is greater than the second diameter;
- first and second electrodes to apply a potential difference across the membrane;
- wherein the respective pore windows have a pore size that is less than the hydrated diameter of the ion for which the ion selective separation membrane is selective;
- and
- wherein the substrate is formed from a 2D layered material selected from the group consisting of graphene oxide, zeolite, MoS2, WS2, and BN.
A method for selectively separating ions in a polar solution, the method comprising:
- providing an ion selective separation membrane comprising:
- a metal organic framework layer formed on, in, and/or around a substrate, the metal organic framework having a crystal structure that includes a first surface and a second surface and includes ion transport channels formed between respective pore windows in the first surface and the second surface, wherein the substrate is a porous substrate having a plurality of channels, and the metal organic framework layer is formed as a plug of metal-organic framework material within each of the channels of the substrate, wherein the channels of the substrate taper from a first diameter at a first surface of the substrate to a second diameter at a second surface of the substrate, wherein the first diameter is greater than the second diameter;
- and
- first and second electrodes to apply a potential difference across the membrane;
- wherein the respective pore windows have a pore size that is less than the hydrated diameter for which the ion selective separation membrane is selective;
- exposing a polar solution containing a plurality of ions to the first surface;
- and
- applying a potential difference from 10 mV to 2 V across the membrane to selectively transport ions into a pore window in the first surface, through the ion transport channel, and out of a pore window in the second surface.
An ion selective separation membrane comprising:
- a nanoporous substrate having a plurality of nanochannels, the nanochannels extending through the nanoporous substrate from openings in a first surface of the nanoporous substrate to openings in a second surface of the nanoporous substrate, wherein the nanochannels taper from a first diameter at the first surface of the nanoporous substrate to a second diameter at the second surface of the nanoporous substrate, wherein the first diameter is greater than the second diameter;
- and
- a plug of a metal-organic framework material within each of the plurality of nanochannels;
- the metal-organic framework having a crystal structure that includes a first surface and a second surface and including ion transport channels between respective pore windows in the first surface and the second surface;
- and
- wherein the respective pore windows have a pore size that is less than the hydrated diameter for which the ion selective separation membrane is selective.
A method of forming an ion selective separation membrane comprising:
- crystallizing a metal-organic framework material from a metal ion and an organic ligand to plug nanochannels of a nanoporous substrate, the nanochannels extending through the nanoporous substrate from openings in a first surface of the nanoporous substrate to openings in a second surface of the nanoporous substrate, wherein the nanochannels taper from a first diameter at the first surface of the nanoporous substrate to a second diameter at the second surface of the nanoporous substrate, wherein the first diameter is greater than the second diameter;
- wherein the metal-organic framework has a crystal structure that includes a first surface and a second surface and includes ion transport channels formed between respective pore windows in the first surface and the second surface;
- and
- wherein the respective pore windows have a pore size that is less than the hydrated diameter for which the ion selective separation membrane is selective.
Dependencies are inferred from the claim text.