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Porous PVDF/PANI ion-exchange membrane (IEM) modified by polyvinylpyrrolidone (PVP) and lithium chloride in the application of membrane capacitive deionisation (MCDI)

Yiming Zhang, Wei Zhang Orcid Logo, Luis F. Cházaro-Ruiz

Water Science and Technology, Volume: 77, Issue: 9, Pages: 2311 - 2319

Swansea University Author: Wei Zhang Orcid Logo

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DOI (Published version): 10.2166/wst.2018.152

Abstract

In this work, polyvinylidene fluoride (PVDF)/polyaniline (PANI) heterogeneous anion-exchange membranes filled with pore-forming agents polyvinylpyrrolidone (PVP) and lithium chloride were prepared by the solution-casting technique using the solvent 1-methyl-2-pyrrolidone (NMP) and a two-step phase i...

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Published in: Water Science and Technology
ISSN: 0273-1223 1996-9732
Published: 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa44308
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Abstract: In this work, polyvinylidene fluoride (PVDF)/polyaniline (PANI) heterogeneous anion-exchange membranes filled with pore-forming agents polyvinylpyrrolidone (PVP) and lithium chloride were prepared by the solution-casting technique using the solvent 1-methyl-2-pyrrolidone (NMP) and a two-step phase inversion procedure. Key properties of the as-prepared membranes, such as hydrophilicity, water content, ion exchange capacity, fixed ion concentration, conductivity and transport number were examined and compared between membranes in different conditions. The pore-forming hydrophilic additives PVP and lithium chloride to the casting solution appeared to improve the ion-exchange membranes (IEMs) by increasing the conductivity, transport number and hydrophilicity. The effects of increasing membrane drying time on the porosity of the as-prepared membranes were found to lower membrane porosity by reducing membrane water content. However, pore-forming agents were found to be able to stabilise membrane transport number with different drying times. As-prepared PVDF/PANI anion-exchange membrane with pore-forming agent is demonstrated to be a more efficient candidate for water purification (e.g. desalination) and other industrial applications.
Keywords: ion-exchange membranes, membrane capacitive deionisation, PANI, PVDF, water purification
College: College of Engineering
Issue: 9
Start Page: 2311
End Page: 2319