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Nano-fibrous sulfonated poly(ether ether ketone) membrane for selective electro-transport of ions
K. P. Rajesh
Published in
2010
Volume: 75
   
Issue: 2
Pages: 174 - 182
Abstract
We reported fabrication of electrospun nano-fibrous ion-exchange membrane (IEM) composed of sulfonated poly(ether ether ketone) (SPEEK). Prepared membrane was employed for electro-dialytic separation of Na+ from Mg 2+ or Ca2+, which is an urgent problem for the production potable water from brackish water and chlor-alkali industries. Nano-fibrous membrane was successfully fabricated onto spun-bonded non-woven polypropylene fabric. Electrospun SPEEK (ESPEEK) and SPEEK thin film membrane's suitability, for the electro-dialytic separation of cations, was assessed by their conductivity measurements under different electrolytic environment using electrochemical impedance spectroscopy. Counter-ion transport number and membrane permselectivity were strongly depended on the nature of counter-ions. ESPEEK membrane showed very low selectivity (about negligible) for Mg 2+ and Ca2+, because formation of nano-fibrous pore or channels, which restricted the migration of bi-valent cations. Additionally, very low flux and electro-transport efficiency for bi-valent cations in compare with Na+ across ESPEEK membrane, suggested its possible application for electro-driven separation of mono-valent and bi-valent electrolytes. Electrospun nano-fibrous IEMs may be the promising candidate for electro-dialytic selective separation of ions depending on their charge and hydrated ionic size. © 2010 Elsevier B.V. All rights reserved.
About the journal
JournalSeparation and Purification Technology
ISSN13835866
Open AccessNo
Concepts (32)
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    BRACKISH WATER
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    CHLOR-ALKALI INDUSTRY
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    Conductivity measurements
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    Counterions
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    ELECTRO-DRIVEN SEPARATION EPARATION
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    ELECTROSPUNS
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    ION FLUX
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    Ionic sizes
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    LOW FLUX
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    NANO-FIBROUS MEMBRANE
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    NON-WOVEN
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    OR CHANNELS
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    PERMSELECTIVITIES
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    SELECTIVE SEPARATION
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    SULFONATED POLY(ETHER ETHER KETONE) MEMBRANES
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    SULFONATED POLYETHERETHERKETONE
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    THIN FILM MEMBRANE
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    TRANSPORT EFFICIENCY
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    URGENT PROBLEMS
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    Calcium
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    Electrochemical corrosion
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    Electrochemical impedance spectroscopy
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    Electrospinning
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    Ethers
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    Fibrous membranes
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    Hydrates
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    Ion exchangers
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    Ketones
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    Positive ions
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    Potable water
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    Size separation
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    Ion exchange