Electrochemical Removal of Cesium Ions via Capacitive Deionization Using an Ion-Exchange Layer Coated on a Carbon Electrode

This study was conducted to evaluate the feasibility of using electrosorption to remove cesium (Cs<sup>+</sup>) ions from aqueous solutions using the membrane capacitive deionization (MCDI) process. The electrochemical properties were analyzed using cyclic voltammetry (CV) and impedance...

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Autores principales:	Sang-Hun Lee, Mansoo Choi, Jei-Kwon Moon, Songbok Lee, Jihoon Choi, Seonbyeong Kim
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	capacitive deionization electrosorption Cs<sup>+</sup> ion removal ion-exchange layer Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/888a7c6e8a0543a99a5ca368565ceda7
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spelling	oai:doaj.org-article:888a7c6e8a0543a99a5ca368565ceda72021-11-11T15:07:20ZElectrochemical Removal of Cesium Ions via Capacitive Deionization Using an Ion-Exchange Layer Coated on a Carbon Electrode10.3390/app1121100422076-3417https://doaj.org/article/888a7c6e8a0543a99a5ca368565ceda72021-10-01T00:00:00Zhttps://www.mdpi.com/2076-3417/11/21/10042https://doaj.org/toc/2076-3417This study was conducted to evaluate the feasibility of using electrosorption to remove cesium (Cs<sup>+</sup>) ions from aqueous solutions using the membrane capacitive deionization (MCDI) process. The electrochemical properties were analyzed using cyclic voltammetry (CV) and impedance spectroscopy (EIS). The activated carbon electrode coated by a polymer layer showed higher specific adsorption capacity (SAC) and removal efficiency of Cs<sup>+</sup> than the AC electrode. The effects of potential, flow rate, initial Cs<sup>+</sup> concentration, and pH values were investigated to optimize the electrosorption performance. The electrosorption capacity increased with an increase in the applied potential and the concentration of Cs<sup>+</sup> in the influent water. The pH value is an important parameter on electrosorption performance. The removal of Cs<sup>+</sup> ions was affected by the pH of the influent water because H<sup>+</sup> ions acted as competing ions during the electrosorption process. Cs<sup>+</sup> was preferentially adsorbed to the electrode in the early stages of adsorption but was later replaced by H<sup>+</sup>. A higher presence of H<sup>+</sup> ions could reduce the adsorption capacity of Cs<sup>+</sup> ions. The ion-exchange layer coated AC electrode was shown to be favorable for the removal of Cs<sup>+</sup>, despite the limited electrosorption ability in a highly acidic solution.Sang-Hun LeeMansoo ChoiJei-Kwon MoonSongbok LeeJihoon ChoiSeonbyeong KimMDPI AGarticlecapacitive deionizationelectrosorptionCs<sup>+</sup> ion removalion-exchange layerTechnologyTEngineering (General). Civil engineering (General)TA1-2040Biology (General)QH301-705.5PhysicsQC1-999ChemistryQD1-999ENApplied Sciences, Vol 11, Iss 10042, p 10042 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	capacitive deionization electrosorption Cs<sup>+</sup> ion removal ion-exchange layer Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
spellingShingle	capacitive deionization electrosorption Cs<sup>+</sup> ion removal ion-exchange layer Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 Sang-Hun Lee Mansoo Choi Jei-Kwon Moon Songbok Lee Jihoon Choi Seonbyeong Kim Electrochemical Removal of Cesium Ions via Capacitive Deionization Using an Ion-Exchange Layer Coated on a Carbon Electrode
description	This study was conducted to evaluate the feasibility of using electrosorption to remove cesium (Cs<sup>+</sup>) ions from aqueous solutions using the membrane capacitive deionization (MCDI) process. The electrochemical properties were analyzed using cyclic voltammetry (CV) and impedance spectroscopy (EIS). The activated carbon electrode coated by a polymer layer showed higher specific adsorption capacity (SAC) and removal efficiency of Cs<sup>+</sup> than the AC electrode. The effects of potential, flow rate, initial Cs<sup>+</sup> concentration, and pH values were investigated to optimize the electrosorption performance. The electrosorption capacity increased with an increase in the applied potential and the concentration of Cs<sup>+</sup> in the influent water. The pH value is an important parameter on electrosorption performance. The removal of Cs<sup>+</sup> ions was affected by the pH of the influent water because H<sup>+</sup> ions acted as competing ions during the electrosorption process. Cs<sup>+</sup> was preferentially adsorbed to the electrode in the early stages of adsorption but was later replaced by H<sup>+</sup>. A higher presence of H<sup>+</sup> ions could reduce the adsorption capacity of Cs<sup>+</sup> ions. The ion-exchange layer coated AC electrode was shown to be favorable for the removal of Cs<sup>+</sup>, despite the limited electrosorption ability in a highly acidic solution.
format	article
author	Sang-Hun Lee Mansoo Choi Jei-Kwon Moon Songbok Lee Jihoon Choi Seonbyeong Kim
author_facet	Sang-Hun Lee Mansoo Choi Jei-Kwon Moon Songbok Lee Jihoon Choi Seonbyeong Kim
author_sort	Sang-Hun Lee
title	Electrochemical Removal of Cesium Ions via Capacitive Deionization Using an Ion-Exchange Layer Coated on a Carbon Electrode
title_short	Electrochemical Removal of Cesium Ions via Capacitive Deionization Using an Ion-Exchange Layer Coated on a Carbon Electrode
title_full	Electrochemical Removal of Cesium Ions via Capacitive Deionization Using an Ion-Exchange Layer Coated on a Carbon Electrode
title_fullStr	Electrochemical Removal of Cesium Ions via Capacitive Deionization Using an Ion-Exchange Layer Coated on a Carbon Electrode
title_full_unstemmed	Electrochemical Removal of Cesium Ions via Capacitive Deionization Using an Ion-Exchange Layer Coated on a Carbon Electrode
title_sort	electrochemical removal of cesium ions via capacitive deionization using an ion-exchange layer coated on a carbon electrode
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/888a7c6e8a0543a99a5ca368565ceda7
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_version_	1718437154898575360

Electrochemical Removal of Cesium Ions via Capacitive Deionization Using an Ion-Exchange Layer Coated on a Carbon Electrode

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