Overlimiting behavior of surface-modified heterogeneous anion-exchange membranes

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F20%3A43921532" target="_blank" >RIV/60461373:22340/20:43921532 - isvavai.cz</a>

Alternative codes found

RIV/49777513:23640/20:43959561

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S0376738820308693?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0376738820308693?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.memsci.2020.118291" target="_blank" >10.1016/j.memsci.2020.118291</a>

Result language

angličtina

Original language name

Overlimiting behavior of surface-modified heterogeneous anion-exchange membranes

Original language description

Electrochemical and electrokinetic behavior of ion-exchange systems as a result of electrostatic interactions between the fixed charge and the ionic species present in the electrolyte can significantly vary with the type of electrolyte and the membrane composition. In this paper, we studied experimentally the effect of surface modification of a heterogeneous anion-exchange membrane on its properties and overlimiting behavior. The surface modification of the anion-exchange membrane included carboxylation of its surface through benzophenone-based photochemistry followed by covalent linkage of single stranded DNA molecules. Such surface chemistry produced molecular layers of negative charge on the positively charged membrane surface. We investigated the membrane samples with different two levels of surface modification after their exposure either to KCl solutions or solutions containing a biopolymer serving as a model membrane foulant. The surface modification resulted in larger system resistances that were especially pronounced in the limiting and overlimiting region. Water splitting reaction on both the pristine and the modified membranes occurred approximately to the same extent. Unlike water splitting, electroconvection, as another mechanism driving overlimiting current, tracked by the PIV method was largely suppressed upon surface modification especially with DNA molecules. The membranes with the chemically modified surfaces showed smaller susceptibility towards fouling. © 2020 Elsevier B.V.

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/GA18-13491S" target="_blank" >GA18-13491S: Interactions of charged polymers with heterogeneous ion-exchange membranes</a><br>

Continuities

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

Publication year

2020

Confidentiality

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

Name of the periodical

Journal of Membrane Science

ISSN

0376-7388

e-ISSN

—

Volume of the periodical

610

Issue of the periodical within the volume

SEP 1 2020

Country of publishing house

US - UNITED STATES

Number of pages

10

Pages from-to

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UT code for WoS article

000555548500002

EID of the result in the Scopus database

2-s2.0-85085936404