Electrodiffusion of ions in ion exchange membranes: Finite element simulations and experiments

Electrodiffusion of ions in both cation (CEM) and anion exchange membranes (AEM) has been studied with theoretical calculations and experimental studies. Calculations are based on the Finite Element Method (FEM) using COMSOL Multiphysics® software. Nernst-Planck equations are solved in multi-ionic s...

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Autores principales:	Kuldeep, Pertti Kauranen, Heikki Pajari, Risto Pajarre, Lasse Murtomäki
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Nernst-Planck equation Multi-ionic transport Ion-exchange membranes Finite element method Simulation Chemical engineering TP155-156
Acceso en línea:	https://doaj.org/article/82b42443ef6e46c38c8351db0ee3c6ea
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spelling	oai:doaj.org-article:82b42443ef6e46c38c8351db0ee3c6ea2021-11-18T04:53:01ZElectrodiffusion of ions in ion exchange membranes: Finite element simulations and experiments2666-821110.1016/j.ceja.2021.100169https://doaj.org/article/82b42443ef6e46c38c8351db0ee3c6ea2021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2666821121000855https://doaj.org/toc/2666-8211Electrodiffusion of ions in both cation (CEM) and anion exchange membranes (AEM) has been studied with theoretical calculations and experimental studies. Calculations are based on the Finite Element Method (FEM) using COMSOL Multiphysics® software. Nernst-Planck equations are solved in multi-ionic systems where no closed form solutions are available. Simulations are compared with laboratory-scale experiments in terms of current efficiency and membrane selectivity. Simulations revealed unexpected features in transport, due to coupling of ionic fluxes when the local electroneutrality condition is assumed. Transport of weak electrolytes showed the importance of involving ionic equilibria along the concentration profiles in both solutions and membranes, compelling to consider ionic constituents. The advantage of the COMSOL simulations is the ease to find concentration and potential profiles across the entire system, and to split fluxes to diffusion and migration contributions, showing their coupling even in the absence of electric current. KuldeepPertti KauranenHeikki PajariRisto PajarreLasse MurtomäkiElsevierarticleNernst-Planck equationMulti-ionic transportIon-exchange membranesFinite element methodSimulationChemical engineeringTP155-156ENChemical Engineering Journal Advances, Vol 8, Iss , Pp 100169- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Nernst-Planck equation Multi-ionic transport Ion-exchange membranes Finite element method Simulation Chemical engineering TP155-156
spellingShingle	Nernst-Planck equation Multi-ionic transport Ion-exchange membranes Finite element method Simulation Chemical engineering TP155-156 Kuldeep Pertti Kauranen Heikki Pajari Risto Pajarre Lasse Murtomäki Electrodiffusion of ions in ion exchange membranes: Finite element simulations and experiments
description	Electrodiffusion of ions in both cation (CEM) and anion exchange membranes (AEM) has been studied with theoretical calculations and experimental studies. Calculations are based on the Finite Element Method (FEM) using COMSOL Multiphysics® software. Nernst-Planck equations are solved in multi-ionic systems where no closed form solutions are available. Simulations are compared with laboratory-scale experiments in terms of current efficiency and membrane selectivity. Simulations revealed unexpected features in transport, due to coupling of ionic fluxes when the local electroneutrality condition is assumed. Transport of weak electrolytes showed the importance of involving ionic equilibria along the concentration profiles in both solutions and membranes, compelling to consider ionic constituents. The advantage of the COMSOL simulations is the ease to find concentration and potential profiles across the entire system, and to split fluxes to diffusion and migration contributions, showing their coupling even in the absence of electric current.
format	article
author	Kuldeep Pertti Kauranen Heikki Pajari Risto Pajarre Lasse Murtomäki
author_facet	Kuldeep Pertti Kauranen Heikki Pajari Risto Pajarre Lasse Murtomäki
author_sort	Kuldeep
title	Electrodiffusion of ions in ion exchange membranes: Finite element simulations and experiments
title_short	Electrodiffusion of ions in ion exchange membranes: Finite element simulations and experiments
title_full	Electrodiffusion of ions in ion exchange membranes: Finite element simulations and experiments
title_fullStr	Electrodiffusion of ions in ion exchange membranes: Finite element simulations and experiments
title_full_unstemmed	Electrodiffusion of ions in ion exchange membranes: Finite element simulations and experiments
title_sort	electrodiffusion of ions in ion exchange membranes: finite element simulations and experiments
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/82b42443ef6e46c38c8351db0ee3c6ea
work_keys_str_mv	AT kuldeep electrodiffusionofionsinionexchangemembranesfiniteelementsimulationsandexperiments AT perttikauranen electrodiffusionofionsinionexchangemembranesfiniteelementsimulationsandexperiments AT heikkipajari electrodiffusionofionsinionexchangemembranesfiniteelementsimulationsandexperiments AT ristopajarre electrodiffusionofionsinionexchangemembranesfiniteelementsimulationsandexperiments AT lassemurtomaki electrodiffusionofionsinionexchangemembranesfiniteelementsimulationsandexperiments
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Electrodiffusion of ions in ion exchange membranes: Finite element simulations and experiments

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