Regeneration Mechanism of Ion Exchange Materials in Electrodeionization System

Regeneration Mechanism of Ion Exchange Materials in Electrodeionization System

The regeneration mechanism of an ion exchange fabric inserted between the ion exchange membranes in the electrodeionizer has been investigated. The ion exchange fabric comprising cation- and anion-exchange fibers was introduced into the diluting compartment of a five-compartment electrodialysis cell...

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Veröffentlicht in:Denki kagaku oyobi kōgyō butsuri kagaku 2002/10/05, Vol.70(10), pp.784-788
Hauptverfasser: YOSHIDA, Shoichiro, KANAZAWA, Naoya, QIU, Liang, UMEDA, Masakado, UCHINO, Hajime, FUKUDA, Junji, AOYAGI, Mitsutake, WATANABE, Tadashi
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Sprache:eng ; jpn
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High Purity Water
Ion Exchange Fabric
Ion Exchange Membrane
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container_end_page 788
container_issue 10
container_start_page 784
container_title Denki kagaku oyobi kōgyō butsuri kagaku
container_volume 70
creator YOSHIDA, Shoichiro
KANAZAWA, Naoya
QIU, Liang
UMEDA, Masakado
UCHINO, Hajime
FUKUDA, Junji
AOYAGI, Mitsutake
WATANABE, Tadashi
description The regeneration mechanism of an ion exchange fabric inserted between the ion exchange membranes in the electrodeionizer has been investigated. The ion exchange fabric comprising cation- and anion-exchange fibers was introduced into the diluting compartment of a five-compartment electrodialysis cell. A significant pH change occurred in the adjacent concentrating compartments when a voltage was applied, probably due to migration of H+ and OH− ions generated by water dissociation in the diluting compartment filled with the ion-exchange fabric. By observing the color change in the ion-exchange fabric adsorbed with phenolphthalein, the water dissociation was found to occur at the boundary between the ion-exchange fabric and an ion-exchange membrane. These findings suggest that water molecules dissociate drastically under a strong electric field at the electrical double layer on the surface of ion-exchange membrane, and the H+ and OH− ions thus formed regenerate the ion-exchange material.
doi_str_mv 10.5796/electrochemistry.70.784
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source J-STAGE (Japan Science & Technology Information Aggregator, Electronic) Freely Available Titles - Japanese
subjects High Purity Water
Ion Exchange Fabric
Ion Exchange Membrane
title Regeneration Mechanism of Ion Exchange Materials in Electrodeionization System
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