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

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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Bibliographic Details
Published in:Water science and technology 2018-05, Vol.77 (9-10), p.2311-2319
Main Authors: Zhang, Yiming, Zhang, Wei, Cházaro-Ruiz, Luis F
Format: Article
Language:English
Subjects:
Additives
Anion exchanging
Anions
Capacity
Chemical reactions
Chemistry
Conductivity
Desalination
Drying
Exchange capacity
Fluorides
Forming
Hydrophilicity
Industrial applications
Ion concentration
Ion exchange
Lithium
Lithium chloride
Membranes
Moisture content
Polyanilines
Polymers
Polyvinylidene fluorides
Polyvinylpyrrolidone
Pore formation
Porosity
Porous materials
Purification
Science
Transport
Water content
Water desalting
Water purification
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Summary: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.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2018.152