Estimation of ion adsorption using iterative analytical model in capacitive deionization process

2018 ◽  
Vol 116 ◽  
pp. 75-82 ◽  
Author(s):  
Mohammed Shafiq ◽  
Karthik Laxman ◽  
Joydeep Dutta
Keyword(s):  
Analytical Model ◽  
Ion Adsorption ◽  
Capacitive Deionization

scholarly journals Towards Electrochemical Water Desalination Techniques: A Review on Capacitive Deionization, Membrane Capacitive Deionization and Flow Capacitive Deionization

Membranes ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 96 ◽  
Author(s):  
Gbenro Folaranmi ◽  
Mikhael Bechelany ◽  
Philippe Sistat ◽  
Marc Cretin ◽  
Francois Zaviska
Keyword(s):  
Brackish Water ◽  
Research Area ◽  
Water Desalination ◽  
Ion Adsorption ◽  
Capacitive Deionization ◽  
Major Research ◽  
Modus Operandi ◽  
Solvated Ions ◽  
The 1960S ◽  
Simple Potential

Electrochemical water desalination has been a major research area since the 1960s with the development of capacitive deionization technique. For the latter, its modus operandi lies in temporary salt ion adsorption when a simple potential difference (1.0–1.4 V) of about 1.2 V is supplied to the system to temporarily create an electric field that drives the ions to their different polarized poles and subsequently desorb these solvated ions when potential is switched off. Capacitive deionization targets/extracts the solutes instead of the solvent and thus consumes less energy and is highly effective for brackish water. This paper reviews Capacitive Deionization (mechanism of operation, sustainability, optimization processes, and shortcomings) with extension to its counterparts (Membrane Capacitive Deionization and Flow Capacitive Deionization).

Selective ion adsorption with pilot-scale membrane capacitive deionization (MCDI): arsenic, ammonium and manganese removal

2020 ◽  
Vol 198 ◽  
pp. 163-169
Author(s):  
Edgardo E. Cañas Kurz ◽  
Ulrich Hellriegel ◽  
Vu T. Luong ◽  
Jochen Bundschuh ◽  
Jan Hoinkis
Keyword(s):  
Pilot Scale ◽  
Ion Adsorption ◽  
Capacitive Deionization ◽  
Manganese Removal

scholarly journals Diffusion-bonded CNT carpets for fundamental CDI studies

2012 ◽  
Vol 1407 ◽  
Author(s):  
R. Enright ◽  
R. Mitchell ◽  
H. Mutha ◽  
C. Lv ◽  
M. Christiansen ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Carbon Nanotube ◽  
Pore Structure ◽  
Electrochemical Capacitor ◽  
Water Desalination ◽  
Carbon Electrodes ◽  
Aqueous Electrolytes ◽  
Ion Adsorption ◽  
Capacitive Deionization ◽  
Multi Scale

ABSTRACTUncertainty about future energy and water supplies suggests a pressing need to develop efficient technologies for water desalination. Capacitive deionization (CDI), a method that captures ions in the electrical double layer (EDL) of an electrochemical capacitor, is a promising technology that can potentially fulfill those requirements. Similar to supercapacitors, ideal CDI electrodes should have a large electrolyte-accessible specific surface area available for ion adsorption with rapid charging/discharging characteristics. Unlike supercapacitors, CDI electrodes are required to operate in aqueous electrolytes with low ionic concentrations in a non-linear charging regime. To explore this practically and theoretically important regime, we developed robust, electrochemically-compatible carbon nanotube (CNT) carpet electrodes that posses a well-defined and uniform pore structure that is more readily analyzed in comparison to the random and multi-scale pore structure of typical carbon electrodes. The fabricated electrodes were characterized using cyclic voltammetry and potentiostatic charging in aqueous NaCl solutions (no = 20 - 90 mM) using a three electrode setup. Examination of the CV and potentiostatically-measured capacitances were consistent with EDL behavior dictated by the Stern layer. However, some deviations from the expected behavior were observed with increasing salt concentration during potentiostatic testing.

scholarly journals Capacitive deionization: a promising technology for water defluoridation: a review

2021 ◽  
Author(s):  
Tusekile Alfredy ◽  
Joyce Elisadiki ◽  
Yusufu Abeid Chande Jande
Keyword(s):  
Metal Oxides ◽  
High Selectivity ◽  
Electrode Materials ◽  
Review Paper ◽  
High Surface ◽  
High Surface Area ◽  
Ionic Species ◽  
Ion Adsorption ◽  
Capacitive Deionization ◽  
Commercial Scale

Abstract Capacitive deionization (CDI) is among the promising technologies employed for water purification. CDI has been studied for the removal of various ionic species from water including fluoride ion (F−) with promising results. However, there is no comprehensive literature that summarizes the use of CDI for water defluoridation applications. Therefore, this review paper critically analyzes different electrode materials that have been studied for water defluoridation, their electrosorption capacities and F− removal efficiencies. It further discussed the parameters that influence CDI efficiency during defluoridation and point out the issues of F− selectivity when coexisting with other ions in the solution. We can conclude that different electrode materials have shown different abilities in electrosorption of F−. The carbon-based materials possess high surface area and good electrical conductivity which is paramount for ion adsorption but lack selectivity for F− removal. Metal oxides and hydroxides have been reported with improved electrosorption capacity and high selectivity to F− due to the ion exchange between the F− and the hydroxyls surface of the metal oxides/hydroxides. Apart from the good performance of these materials for defluoridation, the discovery of actual practicability use of the electrode materials for defluoridation for commercial scale is still a need.

scholarly journals Equilibria model for pH variations and ion adsorption in capacitive deionization electrodes

2017 ◽  
Vol 122 ◽  
pp. 387-397 ◽  
Author(s):  
Ali Hemmatifar ◽  
Diego I. Oyarzun ◽  
James W. Palko ◽  
Steven A. Hawks ◽  
Michael Stadermann ◽  
...  
Keyword(s):  
Ion Adsorption ◽  
Capacitive Deionization ◽  
Ph Variations

On-line method to study dynamics of ion adsorption from mixtures of salts in capacitive deionization

Desalination ◽  
2016 ◽  
Vol 390 ◽  
pp. 47-52 ◽  
Author(s):  
J.E. Dykstra ◽  
J. Dijkstra ◽  
A. van der Wal ◽  
H.V.M. Hamelers ◽  
S. Porada
Keyword(s):  
Ion Adsorption ◽  
Capacitive Deionization ◽  
Line Method ◽  
On Line

Corrugated graphene layers for sea water desalination using capacitive deionization

2017 ◽  
Vol 19 (12) ◽  
pp. 8552-8562 ◽  
Author(s):  
Madhavi Dahanayaka ◽  
Bo Liu ◽  
Zhongqiao Hu ◽  
Zhong Chen ◽  
Adrian Wing-Keung Law ◽  
...  
Keyword(s):  
Sea Water ◽  
Water Desalination ◽  
Ion Adsorption ◽  
Capacitive Deionization ◽  
Graphene Layers ◽  
Graphene Membrane

Graphene membrane corrugation highly enhances ion adsorption in the capacitive deionization process.

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