Investigation of hybrid ion-exchange membranes reinforced with non-woven metal meshes for electro-dialysis applications

Allioux, Francois-Marie, He, Li, She, Fenghua, Hodgson, Peter D., Kong, Lingxue and Dumée, Ludovic F. 2015, Investigation of hybrid ion-exchange membranes reinforced with non-woven metal meshes for electro-dialysis applications, Separation and purification technology, vol. 147, pp. 353-363, doi: 10.1016/j.seppur.2015.03.007.

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Title Investigation of hybrid ion-exchange membranes reinforced with non-woven metal meshes for electro-dialysis applications
Author(s) Allioux, Francois-Marie
He, Li
She, FenghuaORCID iD for She, Fenghua
Hodgson, Peter D.
Kong, LingxueORCID iD for Kong, Lingxue
Dumée, Ludovic F.ORCID iD for Dumée, Ludovic F.
Journal name Separation and purification technology
Volume number 147
Start page 353
End page 363
Total pages 11
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2015
ISSN 1383-5866
Keyword(s) Desalination
Hybrid ion-exchange membranes
Interfacial chemistry
Summary Salt and solvent permeations across ion-exchange membranes used in electro-dialysis are directly related to the membrane material structure and chemistry. Although primarily used for aqueous effluents desalination, electro-dialysis was recently shown to be a promising technology for industrial wastewater and co-solvent mixtures purification. The harsh working conditions imposed by these liquid effluents, including high suspended solids, require the development of more chemically and mechanically resistant membranes. In this study, commercial porous stainless steel media filters (240. μm thick) were used as a backbone to prepare hybrid ion-exchange membranes by casting ion-exchange materials within the porous metal structure. The surface of the metal reinforcements was modified by plasma treatment prior to sol-gel silane grafting to improve the interface between the metal and the ion-exchange resins. The morphology of novel hybrid materials and the interface between the metal fibers and the ion-exchange material have been characterized using techniques such as scanning electron microscopy and FTIR mapping. The thickness of the silane coating was found to lie between 1 and 2. μm while water contact angle tests performed on membrane surfaces and corrosion test behaviors revealed the formation of a thin passivating oxide layer on the material surfaces providing anchoring for the silane grafting and adequate surface energy for the proper incorporation of the ion-exchange material. The hybrid membranes desalination performance were then tested in a bench top electro-dialysis cell over a range of flow rate, current densities and salt concentration conditions to evaluate the ability of the novel hybrid materials to desalinate model streams. The performance of the hybrid membranes were benchmarked and critically compared against commercially available membranes (Selemion™). Although the salt transfer kinetics across the hybrid ion-exchange composite membranes were shown to be comparable to that of the commercial membranes, the low porosity of the stainless steel reinforcements, around 60%, was shown to impede absolute salt permeations. The hybrid ion-exchange membranes were however found to be competitive at low current density and low flow velocity desalination conditions.
Language eng
DOI 10.1016/j.seppur.2015.03.007
Field of Research 090404 Membrane and Separation Technologies
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, Elsevier
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Document type: Journal Article
Collections: Institute for Frontier Materials
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