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Selective ion separation by capacitive deionization (CDI) based technologies: A state-of-the-art review

Abstract

Selective ion extraction from aqueous solution is of great significance for water purification as well as resource recovery. Capacitive deionization (CDI), as an emerging desalination technology, has been introduced to selectively remove target ionic contaminants in the past few years. Due to tailorable electrode material and interface and flexible operation, CDI exhibits great superiority in regulating the ion electrosorption process thus realizing considerable selective adsorption for target contaminant. In this paper, we propose an overview of current status of selective ion adsorption in CDI systems. The mechanism of selectivity is mainly illustrated through regulating ion migration on electrode interface or adsorption in bulk electrode. The applied materials and strategies include (pseudo) capacitive materials, interface membranes/coatings, faradaic reactions and operation optimization. This review also discusses the prospect of selective CDI including its performance evaluation, purpose, application scope, challenge etc., which helps to inform future research in terms of addressing knowledge gaps in developing and applying selective CDI systems.

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Publication details

The article was received on 20 Sep 2019, accepted on 01 Nov 2019 and first published on 04 Nov 2019


Article type: Critical Review
DOI: 10.1039/C9EW00835G
Environ. Sci.: Water Res. Technol., 2019, Accepted Manuscript

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    Selective ion separation by capacitive deionization (CDI) based technologies: A state-of-the-art review

    X. Zhang, K. Zuo, X. Zhang, C. Zhang and P. Liang, Environ. Sci.: Water Res. Technol., 2019, Accepted Manuscript , DOI: 10.1039/C9EW00835G

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