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Photo-switchable smart metal–organic framework membranes with tunable and enhanced molecular sieving performance

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Abstract

Developing a novel MOF membrane material with switchable separation performance is an exciting and challenging research project. In the present work, we report preparation of a new kind of light induced smart MOF membrane, i.e., Cu(AzDC)(4,4′-BPE)0.5 membrane, which shows (i) enhanced molecular sieving performance, and (ii) is able to respond quickly to external light stimuli. Two photo-switchable moieties are addressed in the Cu(AzDC)(4,4′-BPE)0.5 membrane: azobenzene and bis(4-pyridyl)ethylene. When the Cu(AzDC)(4,4′-BPE)0.5 membrane is in situ irradiated with Vis and UV light, the separation factor of a H2/CO2 mixture can be switched reversibly between 21.3 and 43.7. This switching effect is mainly caused by reduced CO2 adsorption in the UV-cis state as proven by independent adsorption studies. For a steric reason, adsorption of CO2 is limited for the UV-cis state. In full agreement with this model, the adsorption of other gases H2, CH4 and N2 as well as their permeation behaviour is not observably influenced by the transcis switching.

Graphical abstract: Photo-switchable smart metal–organic framework membranes with tunable and enhanced molecular sieving performance

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Publication details

The article was received on 02 Nov 2018, accepted on 21 Nov 2018 and first published on 22 Nov 2018


Article type: Paper
DOI: 10.1039/C8TA10541C
Citation: J. Mater. Chem. A, 2018, Advance Article
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    Photo-switchable smart metal–organic framework membranes with tunable and enhanced molecular sieving performance

    C. Liu, Y. Jiang, C. Zhou, J. Caro and A. Huang, J. Mater. Chem. A, 2018, Advance Article , DOI: 10.1039/C8TA10541C

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