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Showing 1 to 15 of 15 for “"Capacitive deionization"”.
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Carbon nanotube electrodes for capacitive deionization
Capacitive deionization (CDI) is a desalination method where voltage is applied across high surface area carbon, adsorbing salt ions and removing them from the water stream. CDI has the potential to be more efficient than existing desalination technologies for brackish water, and more portable due …
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Organic fouling in membrane capacitive deionization systems
Membrane capacitive deionization (MCDI) is an emerging desalination technology that stores ions in the electrical double layer of porous electrodes. For most low-salinity water treatment technologies, fouling is a central issue, but few studies examine the its impact on MCDI. Fouling was evaluated …
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Development of a Predictive and Mechanistic Model for Capacitive Deionization
… develop a mechanistic and predictive model for capacitive deionization (CDI). The commonly-known Gouy Chapman Stern (GCS) model was modified to account for finite ion size and pore geometry by including the Carnahan-Starling (CS) equation of state and considering boundary conditions resulting …
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Incorporation of charged polysaccharide binders to improve capacitive deionization performance
Capacitive deionization (CDI) is a desalination technology which has been subject to a proliferation in research in recent years for its potential to be more energy efficient than reverse osmosis for the treatment of brackish water. One efficiency-limiting phenomenon is the repulsion of co-ions, …
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Effect of permeation of discharge characteristics of capacitive deionization process
… to the annual water use. In recent years, capacitive deionization (CDI) has been reported to potentially solve some of the crucial issues that have plagued the classical desalination processes. CDI is a low-pressure, non-membrane desalination technology that employs the basic …
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Engineering efficient desalination systems: Materials development and systems analysis in capacitive deionization
… in most desalination processes worldwide, capacitive deionization (CDI) — wherein salt ions are removed from solution and stored in electric double layers — is a class of alternative electrochemical desalination technologies that can operate at energy consumption near the thermodynamic …
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Characterization and performance of vertically-aligned carbon nanotubes in capacitive deionization systems
… crisis. As one strategy for water desalination, capacitive deionization (CDI) could prove optimal for brackish water treatment, due to its higher energy efficiencies compared to reverse osmosis and its more inherent resistance to fouling. CDI is a developing technology where adsorption capacity …
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Understanding ionic transport in the macrostructure of polysaccharide bound electrodes for capacitive deionization
Capacitive deionization (CDI) is increasingly being considered as a promising desalination alternative to reverse osmosis and other well-established technologies, especially when it comes to treating low salinity water, such as groundwater. Lifetime and charge efficiency (CE) are the two metrics …
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Capacitive deionization performance of bi-tortuous activated carbon electrodes coated with asymmetrically charged polyelectrolytes
Capacitive deionization (CDI) is an electrochemical desalination technology in which porous carbon electrodes are polarized to reversibly store ions from a brackish water feed in electrical double layers in the electrodes. CDI is an attractive alternative to commonly used brackish water …
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A combined modeling and experimental study assessing the impact of fluid pulsation and operating schemes on charge and energy efficiency in capacitive deionization
Cell-cycling performance in capacitive deionization (CDI) can suffer from various charge-efficiency loss mechanisms. In conventional CDI, we show that salt residue within electrodes introduces a temporal lag between charge and desalination stages of a CDI cycle. Without accounting for this effect …
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Carbon-based electric double layer capacitors for water desalination
In capacitive deionization (CDI), salt water is passed through two polarized electrodes, whereby salt is adsorbed onto the electrode surface and removed from the water stream. This approach has received renewed interest for water desalination due to the development of new high-surface area, …
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Functionalized Polymeric Coatings for Enhanced Selective Removal of Ions in Electric-Field Driven Processes
… membrane-based technologies (i.e., membrane capacitive deionization (MCDI) and electrodialysis (ED)) are actively utilized to extract ions for water purification purposes. These electrified filtration systems have ion-exchange membranes placed in front of each electrode, or chamber, to …
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Characterization of manganese oxide coated porous carbon aerogel to isolate the effects of electro-less deposition time, li+ -ion exchange, and heat treatment on ion selectivity and specific capacitance
… on an up and coming desalination technique. Capacitive deionization (CDI) is a novel method based on the general concept of ion electro-sorption, with two electrodes acting as capacitors [1]. When polarized in charge/discharge cycles, these cells will remove foreign ions out of brackish water …
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Application of scalable and inexpensive modification on carbon in clean technologies
… for applications in water desalination by capacitive deionization (CDI) and electrochemical H₂O₂ synthesis via oxygen reduction reaction (ORR). In the first application, a systematic study has been conducted for controllable and quantifiable impregnation of a cationic surfactant cetyl …
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Characterization of redox active materials to enable electrochemical separations through faradaic deionization
Faradaic deionization (FDI) is an emerging electrochemical separations technique which has received tremendous research interest in the past decade. Established electrochemical separations techniques such as capacitive deionization are limited by low charge storage capacity due to electric double …