Thermodynamic model for a reversible desalination cycle using weak polyelectrolyte hydrogels

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F18%3A10386201" target="_blank" >RIV/00216208:11310/18:10386201 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.desal.2018.05.002" target="_blank" >https://doi.org/10.1016/j.desal.2018.05.002</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.desal.2018.05.002" target="_blank" >10.1016/j.desal.2018.05.002</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Thermodynamic model for a reversible desalination cycle using weak polyelectrolyte hydrogels

Popis výsledku v původním jazyce

The recently proposed use of hydrogels for water desalination is based on the decrease of salt concentration in the gel upon compression. In the first experiments, desalination cycles using hydrogels involved an irreversible mixing step, which inevitably reduced the thermodynamic efficiency. This approach could become competitive with membrane-based desalination methods if it could work close to maximum thermodynamic efficiency. In this work, we develop a thermodynamic model for compression of weak polyelectrolyte hydrogels in open and closed systems. We use this model to design a fully reversible desalination cycle which can, in principle, achieve maximum thermodynamic efficiency. We also show that compressing weak polyelectrolyte hydrogels at low salinity decreases their ionization, thereby leading to a non-monotonic dependence of salt concentration on the gel compression. Therefore, our model shows how to redesign the desalination cycle when using weak polyelectrolytes at low salinities.

Název v anglickém jazyce

Thermodynamic model for a reversible desalination cycle using weak polyelectrolyte hydrogels

Popis výsledku anglicky

The recently proposed use of hydrogels for water desalination is based on the decrease of salt concentration in the gel upon compression. In the first experiments, desalination cycles using hydrogels involved an irreversible mixing step, which inevitably reduced the thermodynamic efficiency. This approach could become competitive with membrane-based desalination methods if it could work close to maximum thermodynamic efficiency. In this work, we develop a thermodynamic model for compression of weak polyelectrolyte hydrogels in open and closed systems. We use this model to design a fully reversible desalination cycle which can, in principle, achieve maximum thermodynamic efficiency. We also show that compressing weak polyelectrolyte hydrogels at low salinity decreases their ionization, thereby leading to a non-monotonic dependence of salt concentration on the gel compression. Therefore, our model shows how to redesign the desalination cycle when using weak polyelectrolytes at low salinities.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

<a href="/cs/project/GJ17-02411Y" target="_blank" >GJ17-02411Y: Modelování responzivních polymerních gelů na různých škálách</a><br>

Návaznosti

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

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

Desalination

ISSN

0011-9164

e-ISSN

—

Svazek periodika

442

Číslo periodika v rámci svazku

December

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

12

Strana od-do

32-43

Kód UT WoS článku

000438003900004

EID výsledku v databázi Scopus

2-s2.0-85047188334