Metal-organic framework supported on porous polymer

摘要

The growth of continuous MOF membranes on porous polymeric supports is reported, wherein a dip-coating procedure is used to deposit a layer of seed MOF nanocrystals on the surfaces of porous polymers, preferably in the form of hollow fibers, and polycrystalline MOF membranes are subsequently grown at temperatures as low as 65° C. from precursor solutions. The present work opens the road to inexpensive and scalable fabrication of MOF membranes for large-scale separation applications.

主权项

1. A method of preparing a MOF-membrane-polymer, comprising:
a) dip-coating a porous polymer with a seed solution comprising MOF nanocrystals of average size <1 micron suspended in a first solvent that can penetrate the porous polymer, wherein the seed solution comprises about 0.4 wt % MOF nanocrystals in the first solvent, and wherein the first solvent is selected from the group consisting of water, methanol, ethanol, propanol, butanol, chloroform, toluene, hexane, and combinations thereof, with the proviso that the first solvent does not solubilize the porous polymer; b) drying the dip-coated porous polymer; c) growing larger MOF crystals on the dip-coated porous polymer at less than 100° C. in a growth solution to make a MOF-membrane-polymer, the growth solution comprising MOF precursors solubilized in a second solvent, wherein the growth solution comprises 0.5-1.0 wt % ligand and 0.5-1.0 wt % zinc in the second solvent, and wherein the second solvent is independently selected from the group consisting of ethanol, propanol, butanol, chloroform, toluene, hexane, and combinations thereof, with the proviso that the second solvent does not solubilize the porous polymer; and d) rinsing and drying the MOF-membrane-polymer.