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Issue 36, 2018
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Metal–organic frameworks for dye sorption: structure–property relationships and scalable deposition of the membrane adsorber

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Abstract

Metal–organic frameworks (MOFs) are increasingly being used for the sorption of dye molecules. Researchers have demonstrated the high sorption performance of several MOFs; however, their structure–property relationships have yet to be fully elucidated. Furthermore, the lack of a generalized deposition method for the fabrication of MOF membranes limits the industrial-scale application of MOF-based sorbents. In this work, we used a polymorphic system with three MOFs, ZIF-8, ZIF-L, and dia(Zn), to identify the key factors affecting the dye sorption performance. We found that ZIF-L, which possesses free imidazole molecules that leach into water during sorption, had the highest sorption capacity for the dye molecule rose bengal. We developed a wet deposition method for the creation of ZIF-L membranes on a porous alumina substrate using stabilized suspensions of ZIF-L. Tubular alumina supports cast with ZIF-L were used as a membrane adsorber for the removal of rose bengal under continuous-flow conditions. Finally, we investigated the influence of the membrane adsorber synthesis conditions on the sorption characteristics.

Graphical abstract: Metal–organic frameworks for dye sorption: structure–property relationships and scalable deposition of the membrane adsorber

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Publication details

The article was received on 29 Jun 2018, accepted on 05 Aug 2018 and first published on 13 Aug 2018


Article type: Paper
DOI: 10.1039/C8CE01066H
Citation: CrystEngComm, 2018,20, 5465-5474
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    Metal–organic frameworks for dye sorption: structure–property relationships and scalable deposition of the membrane adsorber

    H. Chi, S. Hung, M. Kan, L. Lee, C. H. Lam, J. Chen and D. Kang, CrystEngComm, 2018, 20, 5465
    DOI: 10.1039/C8CE01066H

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