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Structural transformation of metal-organic framework MIL-68(Al) to obtain nanosheets of MIL-53(Al) applied in membranes with improved CO2/N2 and CO2/CH4 selectivities

Abstract

MIL-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, the structural transformation from MIL-68(Al) to MIL-53(Al) was carried out by immersion in water under different conditions (ultrasound, stirring, reflux, 60 °C and room temperature) following a crackling core model. The transformation process gave rise to MIL-53(Al) nanosheets of ca. 150 nm in size with an average thickness of 3.5 ± 0.9 nm. The disaggregated MIL-53(Al) nanosheets prepared under the 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).

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Publication details

The article was accepted on 05 Oct 2018 and first published on 05 Oct 2018


Article type: Paper
DOI: 10.1039/C8DT03774D
Citation: Dalton Trans., 2018, Accepted Manuscript
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    Structural transformation of metal-organic framework MIL-68(Al) to obtain nanosheets of MIL-53(Al) applied in membranes with improved CO2/N2 and CO2/CH4 selectivities

    A. Perea-Cachero, J. Sánchez-Laínez, B. Zornoza Encabo, E. Romero, C. Téllez Ariso and J. Coronas, Dalton Trans., 2018, Accepted Manuscript , DOI: 10.1039/C8DT03774D

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