NDLI: Multilayered polyelectrolyte complexes as nanofiltration membranes for anion separation

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Multilayered polyelectrolyte complexes as nanofiltration membranes for anion separation

Content Provider	Semantic Scholar
Author	Ahmadiannamini, Pejman Li, Xianfeng Goyens, Ward Vankelecom, Ivo F. J. Meesschaert, Boudewijn
Copyright Year	2009
Abstract	The layer-by-layer (LBL) deposition of polyelectrolytes (PE) has emerged as a versatile and inexpensive method for the construction of polymeric thin films, often with nanometer-scale control over the spatial distribution of ionized species within the film. This is normally done via the alternating exposure of a charged substrate to solutions of positive or negative PEs. Films prepared via this method are in particular attractive materials for membrane separation for several reasons: (1) film thickness can be controlled to the nanometer scale simply by varying the number of deposited bilayers, and (2) nearly any PE can form these films, enabling easy tuning for a given separation through proper selection of the bilayer constituents. In the present work, alternating deposition of oppositely charged PEs was used to prepare nanofiltration membranes to separate anions. A new combination of PEs, poly(diallyldimethylammonium chloride) (PDDA) and sulfonated poly(ether ether ketone) (SPEEK), is reported from which supported membranes consisting of 5, 10, 15, and 20 bilayers were prepared via the layer-by-layer method at different salt concentrations. The morphology of the membranes was studied in detail by SEM and AFM, showing rougher membrane surfaces with increasing bilayer number. PE complex based membranes were applied in anion separation and the effects of bilayers number and salt concentration on performance of membranes were studied. Prepared membranes showed retentions in range of 1040% for chloride and 70-95% for sulfate and phosphate, confirming the potential of anion separation.
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Alternate Webpage(s)	http://www.mipvlaanderen.be/filedc6c.pdf?id=108
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Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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