Journal
ACS Applied Materials & Interfaces
Volume 8, Issue 46, Pages 32041-32049Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b11074
Keywords
metal-organic frameworks; mixed matrix membrane; interfacial binder; ionic liquid; gas separation
Funding
- Australian Research Council [FT120100720]
- CSC from China
- Australian Research Council [FT120100720] Funding Source: Australian Research Council
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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, thefavorableMOF/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 CO2 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.
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