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 536515
Title Capacitive deionization with wire-shaped electrodes
Author(s) Mubita, T.M.; Porada, S.; Biesheuvel, P.M.; Wal, A. van der; Dykstra, J.E.
Source Electrochimica Acta 270 (2018). - ISSN 0013-4686 - p. 165 - 173.
Department(s) Sub-department of Environmental Technology
Publication type Refereed Article in a scientific journal
Publication year 2018
Keyword(s) Amphoteric donnan model - Capacitive deionization - Dynamic ion adsorption theory - Wire-shaped electrodes
Abstract Capacitive deionization is a desalination technology to remove ions from aqueous solution in a cyclic manner by applying a voltage between pairs of porous electrodes. We describe the dynamics of this process by including a possible rate limitation in the transport of ions from the interparticle pore space in the electrode into intraparticle pores, where electrical double layers are formed. The theory includes the effect of chemical surface charge located in the intraparticle pores, which is present in the form of acidic and basic groups. We present dynamic data of salt adsorption for electrodes with and without coated ion-exchange membranes. Experiments were conducted in a CDI cell geometry based on wire-shaped electrodes placed together. The electrodes consisted of graphite rods coated with a layer of porous carbon. To fabricate this layer, we examined two procedures that involve the use of different solvents: acetone and N-methyl-2-pyrrolidone (NMP). We found that electrodes prepared with acetone had a lower salt adsorption compared to electrodes prepared with NMP. At equilibrium, the theory is in agreement with data, and this agreement underpins the effect of chemical surface groups on electrode performance. Under dynamic conditions, our theory describes reasonably well desalination cycles.
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