Overlimiting behavior of surface-modified heterogeneous anion-exchange membranes

Kód výsledku v 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>

Nalezeny alternativní kódy

RIV/49777513:23640/20:43959561

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Overlimiting behavior of surface-modified heterogeneous anion-exchange membranes

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Overlimiting behavior of surface-modified heterogeneous anion-exchange membranes

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20401 - Chemical engineering (plants, products)

Projekt

<a href="/cs/project/GA18-13491S" target="_blank" >GA18-13491S: Interakce nabitých polymerů s heterogenními iontově-výměnnými membránami</a><br>

Návaznosti

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

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

Journal of Membrane Science

ISSN

0376-7388

e-ISSN

—

Svazek periodika

610

Číslo periodika v rámci svazku

SEP 1 2020

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

10

Strana od-do

—

Kód UT WoS článku

000555548500002

EID výsledku v databázi Scopus

2-s2.0-85085936404