Ionic Liquids as the MOFs/Polymer Interfacial Binder for Efficient Membrane Separation

Abstract

Obtaining strong interfacial affinity between filler and polymer is critical to the preparation of mixed matrix membranes (MMMs) with high separation efficiency. However, it is still a challenge for micron-sized metal organic frameworks (MOFs) to achieve excellent compatibility and defect-free interface with polymer matrix. Thin layer of ionic liquid (IL) was immobilized on micron-sized HKUST-1 to eliminate the interfacial nonselective voids in MMMs with minimized free ionic liquid (IL) in polymer matrix, and then the obtained IL decorated HKUST-1 was incorporated into 4,4'-(hexafluoroisopropylidene)diphthalic anhydride-2,3,5,6-tetramethyl-1,3-phenyldiamine (6FDA-Durene) to fabricate MMMs. Acting as a filler/polymer interfacial binder, the favorable MOF/IL and IL/polymer interaction can facilitate the enhancement of MOF/polymer affinity. Compared to MMM with only HKUST-1 incorporation, MMM with IL decorated HKUST-1 succeeded in restricting the formation of nonselective interfacial voids, leading to an increment in CO selectivity. The IL decoration method can be an effective approach to eliminate interfacial voids in MMMs, extending the filler selection to a wide range of large-sized fillers.

Improving Gas Separation Performance of ZIF-8 by [BMIM][BF4] Incorporation: Interactions and Their Consequences on Performance

“…[8][9] IL-MOF combinations have been considered recently in the gas separation field. [10][11][12][13][14][15][16] For instance, Chen et al 17 incorporated IRMOF-1 composite and reported a CO 2 /N 2 selectivity of 70 at ambient conditions. To understand the effect of different types of ILs on the separation performances of IL-MOF systems, ILs with the same cations but different anions were studied.…”

Mixed‐Matrix Membranes Formed from Multi‐Dimensional Metal–Organic Frameworks for Enhanced Gas Transport and Plasticization Resistance

“…[3] As af iller,m etal-organic frameworks (MOFs) are an attractive class of crystalline materials, which are composed of metal ions or metal clusters bridgedb yo rganic ligands. [8][9][10][11] This MOF hasavariety of attractive features for small molecule separations includingp ore channels of only 9 (Figure S1, see the Supporting Information) [12] and coordinatively unsaturated (open)m etal sites, which endows this material with exceptional adsorption-based selectivities. [6,7] Among the hundreds of thousands of known MOFs, [6,7] HKUST-1i sacommonly investigated MOF for MMM applications.…”

Preparation of Liquid Crystalline Molecularly Imprinted Polymer Coated Metal Organic Framework for Capecitabine Delivery

“…All the composites showed the Type H3 hysteresis loop with adsorption limiting at high P / P 0 , suggesting slit shaped pores due to the aggregates of plate‐like particles. In Table 1 , compared to the HKUST‐1, the value of Brunauer–Emmett–Teller (BET) surface area and pore volume showed a significant decrease for the HKUST‐1@LC‐MIP, this may be attributed to the MIP layer on the HKUST‐1 and the blocking effect of LC MIP on the pore . These results could also suggest that the LC MIP may affect the morphology of HKUST‐1.…”