Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 561577
Title Nickel hexacyanoferrate electrodes for high mono/divalent ion-selectivity in capacitive deionization
Author(s) Singh, Kaustub; Qian, Zexin; Biesheuvel, P.M.; Zuilhof, Han; Porada, Slawomir; Smet, Louis C.P.M. de
Source Desalination 481 (2020). - ISSN 0011-9164
DOI https://doi.org/10.1016/j.desal.2020.114346
Department(s) Organic Chemistry
VLAG
Publication type Refereed Article in a scientific journal
Publication year 2020
Keyword(s) Capacitive deionization - Ion-selective intercalation - Mono/divalent selectivity - Prussian blue analogues
Abstract

Selective ion removal has been a point of focus in capacitive deionization because of its industrial applications such as water purification, water softening, heavy metal separation and resource recovery. Conventionally, carbon is used as electrode material for selectivity. However, recent developments focus on intercalation materials such as Prussian Blue Analogues, due to their size-based preference towards cations. Selectivity of nickel hexacyanoferrate electrodes from a mixture of Na+, Mg2+, and Ca2+ ions was studied in this work. Here, a CDI cell with two identical NiHCF electrodes was operated in two desalination modes: (a) cyclic, in which ions are removed from and released into the same water reservoir and thus, the ion concentration remains the same after one cycle, and (b) continuous, in which ions are removed from one water reservoir and released back in a different reservoir. An average separation factor of ≈15 and 25, reflecting the selectivity of the electrodes, was obtained for Na+ over Ca2+ and Mg2+ from an equimolar solution of Na+, Ca2+ and Mg2+ in both, cyclic and continuous desalination. It was concluded that NiHCF, used in a symmetric CDI cell, is a promising material for highly selective removal of Na+ from a multivalent ion mixture.

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