Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 582, Issue -, Pages 442-453Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2019.02.016
Keywords
Nanofiltration; Interfacial initiation of polymerization; Poly(epoxyether); Chlorine-resistance; Extreme conditions; TFC-membranes
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Funding
- KU Leuven [OT/11/061]
- Belgian Federal Government [IAP 6/27]
- Flemish Government [Nanomexico AIO/150474/SBO]
- Research Foundation Flanders (FWO) [1S00917N]
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Membrane technology is currently still excluded from separations in more aggressive feeds due to limited chemical robustness. To extent its applicability, a novel thin-film composite (TFC) membrane was synthesized via the homopolymerization of epoxide monomers, resulting in robust poly(epoxyether) top-layers with > 90% rose bengal (MW = 1017 Da) and 70% methyl orange (MW = 327 Da) retention with reasonable water fluxes (> 2 Lm(-2) h(-1) bar(-1)). The superior chemical stability of this novel nanofiltration membrane type was proven via treatments in pH 1 and 500 ppm NaOCl (pH 4) for, respectively, 48 h and 2.5 h, after which an unchanged or even improved membrane performance was observed. Additionally, the synthesis of the thin top-layer occurred via an interfacial initiation of the polymerization (IIP), rather than via state-of-the-art interfacial polymerization (IP). This IIP approach allowed to convert well-known monophasic bulk epoxide polymerization (commonly used in e.g. the automotive and coating industry), into the synthesis of thin, yet cross-linked top-layers.
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