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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| Auteurs principaux: | , , , , , |
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| Format: | article |
| Langue: | EN |
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MDPI AG
2021
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| Accès en ligne: | https://doaj.org/article/888a7c6e8a0543a99a5ca368565ceda7 |
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| Résumé: | 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. |
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