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Metal-organic frameworks for dye sorption: structure-property relationships and scalable deposition of membrane adsorber

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, the 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 factor affecting 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 membrane adsorber synthesis conditions on the sorption characteristics.

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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, Accepted Manuscript
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    Metal-organic frameworks for dye sorption: structure-property relationships and scalable deposition of membrane adsorber

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

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