Polyelectrolyte Hydrogels as Draw Agents for Desalination of Solutions with Multivalent Ions

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F22%3A10448723" target="_blank" >RIV/00216208:11310/22:10448723 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=Th5E0j_9qM" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=Th5E0j_9qM</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/acs.macromol.1c02266" target="_blank" >10.1021/acs.macromol.1c02266</a>

Result language
angličtina
Original language name
Polyelectrolyte Hydrogels as Draw Agents for Desalination of Solutions with Multivalent Ions
Original language description
We model a process of seawater desalination that employs compression of a weak polyelectrolyte hydrogel as the drawing force for ion transfer. We model seawater as an aqueous solution containing mono- and divalent ions, Na(+), Cl(-), and Ca(2+). We demonstrate that the compression of hydrogel in equilibrium with a bath containing such a solution creates two types of ion flow. The first type is the exchange of divalent Ca(2+) by monovalent Na(+). The charge density during this process is preserved, so that per one absorbed Ca(2+) two Na(+) are released. The second type is the desalination itself which leads to the uptake of Na(+) and Cl(-) pairs from the surrounding solution. The first flow predominates when Ca(2+) are in excess; however, as their fraction in the solution decreases, desalination flow becomes more significant. We have shown that although the gel is a weak polyelectrolyte, its compression in the presence of divalent ions does not influence its ionization degree. This is caused by a significant screening of electrostatic interactions by divalent ions. When the density of Ca(2+) is small, the gel compression may lead to its discharge and to the release of counterions, which shows up in an increase of the solution ionic strength.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10403 - Physical chemistry

Project
<a href="/en/project/GJ19-17847Y" target="_blank" >GJ19-17847Y: Development of effective desalination methods using polyelectrolyte hydrogels</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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