Overlimiting mechanisms of heterogeneous cation- and anion-exchange membranes: A side-by-side comparison

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F24%3A43931356" target="_blank" >RIV/60461373:22340/24:43931356 - isvavai.cz</a>

Alternative codes found

RIV/49777513:23640/24:43970893

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S0011916423007257?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0011916423007257?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.desal.2023.117093" target="_blank" >10.1016/j.desal.2023.117093</a>

Result language

angličtina

Original language name

Overlimiting mechanisms of heterogeneous cation- and anion-exchange membranes: A side-by-side comparison

Original language description

Overlimiting ionic transfer attainable at ion-exchange membranes is a potential way to intensify electromembrane separation processes, such as electrodialysis. The primary mechanisms responsible for overlimiting current are electroconvection, natural convection, and water splitting. For the first time, the present study experimentally investigates all three mechanisms on heterogeneous anion- and cation-exchange membranes, using direct membrane observation and indirect measurement of pH changes in 0.01 M KCl solution. Although the anion- and cation-exchange systems are designed to exhibit the same behavior with different counterions, our results indicate significant differences in the overlimiting ionic transfer. The strong polarization of cationexchange membranes produced an intensive electroconvective vortex with characteristic velocities in hundreds of mu m/s superimposed by an upward electrolyte motion caused by natural convection. No pH changes associated with the water-splitting reaction were observed. The same conditions applied to the anion-exchange membrane resulted in profound pH changes, weaker electroconvection, and natural convection, reaching similar characteristic velocities to the other studied system. Generally, anion-exchange systems were characterized by more significant fluctuations in measured characteristics and were susceptible to fouling by one of the negatively charged markers. The obtained data provide a unified description of phenomena that may occur in the elec-trodialysis of low-concentrated ionic solutions.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20401 - Chemical engineering (plants, products)

Project

<a href="/en/project/GA20-21263S" target="_blank" >GA20-21263S: Analysis of electrodialysis in milifluidic flow-through systems</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

DESALINATION

ISSN

0011-9164

e-ISSN

1873-4464

Volume of the periodical

571

Issue of the periodical within the volume

117093

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

12

Pages from-to

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UT code for WoS article

001104562300001

EID of the result in the Scopus database

2-s2.0-85175343114