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Issue 42, 2016
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Controlled positioning of MOFs in interfacially polymerized thin-film nanocomposites

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Abstract

An advanced synthesis protocol for the preparation of Thin-Film Nanocomposite (TFN) membranes is presented. The Evaporation-controlled Filler Positioning (EFP) method carefully pre-positions the filler (ZIF-8 nanoparticles) exactly at the water/solvent interface before the initiation of the interfacial polymerization. A permeance increase of 220% compared to the counterpart without filler is observed, corresponding to the highest ever reported permeance increase upon filler incorporation for MOF-based TFN membranes without rejection loss. Moreover, optimal membrane performance is already obtained at a MOF concentration as low as 0.005 w/v%, which represents an 80 times reduction in the required amount of filler compared to other reported ZIF-8 based TFN membranes. This explicitly proves the importance of pre-positioning the filler right where it is needed, i.e. at the organic/water interface, before the interfacial polymerization. ZIF-8 based TFN membranes are prepared via both the EFP and the conventional synthesis method and a comparison between both protocols was made. Additionally, the influence of the size of the filler is investigated. All prepared membranes are further characterized using SEM, TEM, ATR-FTIR and XPS. The EFP-method is found to lead to better and more reproducible filtration performances.

Graphical abstract: Controlled positioning of MOFs in interfacially polymerized thin-film nanocomposites

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Publication details

The article was received on 20 Jun 2016, accepted on 19 Aug 2016 and first published on 19 Aug 2016


Article type: Paper
DOI: 10.1039/C6TA05175H
Citation: J. Mater. Chem. A, 2016,4, 16368-16376
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    Controlled positioning of MOFs in interfacially polymerized thin-film nanocomposites

    C. Van Goethem, R. Verbeke, S. Hermans, R. Bernstein and I. F. J. Vankelecom, J. Mater. Chem. A, 2016, 4, 16368
    DOI: 10.1039/C6TA05175H

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