Abstract
Development of mixed matrix membranes (MMMs) with excellent permeance and selectivity applied for gas separation has been the focus of world attention. However, preparation of high-quality MMMs still remains a big challenge due to the lack of enough interfacial interaction. Herein, ionic liquid (IL)-modified UiO-66-NH2 filler was first incorporated into microporous organic polymer material (PIM-1) to prepare dense and defect-free mixed matrix membranes via a coating modification and priming technique. IL [bmim][Tf2N] not only improves the hydrophobicity of UiO-66-NH2 and facilitates better dispersion of UiO-66-NH2 nanoparticles into PIM-1 matrix, but also promotes the affinity between MOFs and polymer, sharply reducing interface non-selective defects of MMMs. By using this strategy, we can not only facilely synthesize high-quality MMMs ignoring non-selective interfacial voids, but also structurally regulate MOF nanoparticles in the polymer substrate and greatly improve interface compatibility and stability of MMMs. The method also gives suitable level of generality for fabrication of versatile defect-free MMMs based on different combination of MOFs and PIMs. The prepared UiO-66-NH2@IL/PIM-1 membrane exhibited outstanding gas separation behavior with large CO2 permeation of 8283.4 Barrer and high CO2/N2 selectivity of 22.5.
Highlights
With the development of the economy, the soaring increase of greenhouse-gas emissions generated from industrial activities poses a huge threat to human society
To increase the practicability of polymer membranes based on polymers of intrinsic microporosity, the design concept of introducing porous fillers into the polymer matrix for preparing high-quality mixed matrix membranes (MMMs) is proposed [10,11]
UiO-66-NH2 @ionic liquid (IL) was obtained by blending UiO-66-NH2 and [bmim][Tf2 N] via solventimmersion method
Summary
With the development of the economy, the soaring increase of greenhouse-gas emissions generated from industrial activities poses a huge threat to human society. To increase the practicability of polymer membranes based on polymers of intrinsic microporosity, the design concept of introducing porous fillers into the polymer matrix for preparing high-quality mixed matrix membranes (MMMs) is proposed [10,11]. After reducing the size of UiO-66 by functionalizing MOF walls and water modulation, MOF particles of 20–30 nm were synthesized and a prepared MMM with better separation efficiency was obtained [10] Another way to improve the adhesion of polymers to MOF is to modify the outer surface of a MOF with functional groups that can form strong or weak interactions with specific polymers. The of ionic liquids is an effective solution to break through the interfacial bottlenecks between ing technique to synthesize high-quality amino-functional UiO-66/PIM-1 mixed matrix polymers and fillers. 2@IL/PIM-1 MMM by coating modification and priming technique
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