Preparation of Amino-Functional UiO-66/PIMs Mixed Matrix Membranes with [bmim][Tf2N] as Regulator for Enhanced Gas Separation

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.

Assembling ionic liquids in MOF “Monomer” based membranes to trigger CO2/CH4 separation

“…1c can be assigned to the symmetric and asymmetric extension of the –CH 2 – group in the [BMIM] (+) alkyl chain. 30–32 These results confirmed the successful loading of ILs into M1–M3. Compared with M0, the –COOH characteristic peak of M1–M3 membranes shifted from 1700 cm −1 to 1670 cm −1 (Fig.…”

Highly stable Pebax® Renew® thin-film nanocomposite membranes with metal organic framework ZIF-94 and ionic liquid [Bmim][BF4] for CO2 capture

“…25 Interestingly, this approach has been followed to prepare a mix of both solid particles and ILs, which is now gaining special attention due to the possibility of boosting the gas separation performance of membranes by combining their properties. Lu et al 26 prepared PIM-1 mixed matrix membranes (MMMs) with an IL-modified UiO-66-NH 2 filler. They found that the IL improved not only the hydrophobicity of UiO-66-NH 2 , thus facilitating the dispersion of the particles into the polymer, but also the affinity between the MOF and polymer.…”

“…25 Interestingly, this approach has been followed to prepare a mix of both solid particles and ILs, which is now gaining special attention due to the possibility of boosting the gas separation performance of membranes by combining their properties. Lu et al 26 prepared PIM-1 mixed matrix membranes (MMMs) with a Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, Zaragoza 50018, Spain. E-mail: coronas@unizar.es b Chemical and Environmental Engineering Department, Universidad de Zaragoza, Zaragoza 50018, Spain † Electronic supplementary information (ESI) available.…”

Fabrication of a Cation-Exchange Membrane via the Blending of SPES/N-Phthaloyl Chitosan/MIL-101(Fe) Using Response Surface Methodology for Desalination

“…This nature provides an opportunity for improving the mechanical and thermal stabilities of the hybrid membranes, as well as their ionic conductivity [23]. To sum up, incorporating MOFs in hybrid ion exchange membranes would acquire unique advantages over other nanostructure materials [24,25]. Incorporating acid-grafted inorganic fillers into the polymer matrix can increase the proton conductivity and interfacial compatibility of the composite membranes.…”