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Nanosheets of MIL-53(Al) applied in membranes with improved CO2/N2 and CO2/CH4 selectivities

AuthorsPerea-Cachero, Adelaida; Sánchez-Laínez, Javier; Zornoza, Beatriz; Romero-Pascual, Enrique; Téllez, Carlos; Coronas, Joaquín
Issue Date2019
PublisherRoyal Society of Chemistry (UK)
CitationDalton Transactions 48(10): 3392-3403 (2019)
AbstractMIL-68(Al) and MIL-53(Al) are carboxylate-based metal–organic frameworks (MOFs) with the same chemical composition but different structures (polymorphs). In this study, MIL-53(Al) nanosheets of ca. 150 nm in size with an average thickness of 3.5 ± 0.9 nm were obtained after immersion of a sample composed of MIL-68(Al) and MIL-53(Al) in water under different conditions (ultrasound, stirring, reflux, 60 °C and room temperature). The disaggregated MIL-53(Al) nanosheets produced under more severe conditions were suspended in a PDMS solution and then deposited on asymmetric polyimide P84® supports under vacuum filtration to form supported mixed matrix membranes (MMMs). When applied to the separation of CO2/CH4 and CO2/N2 mixtures, the MMM with MIL-53(Al) nanosheets improved the CO2/CH4 (28.4–28.7 vs. 22.4) and CO2/N2 (19.9–23.2 vs. 17.5) selectivities of the conventional MIL-53(Al) MMM with higher CO2 permeances (20.8–29.6 GPU vs. 9.5 GPU for CO2/CH4 and 17.7–26.8 GPU vs. 11.2 GPU for CO2/N2).
Publisher version (URL)https://doi.org/10.1039/C8DT03774D
Appears in Collections:(ICMA) Artículos
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