Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 27 for “"deionization"”.
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Sugar cane juice deionization
Thesis: M.S., Massachusetts Institute of Technology, Department of Chemical Engineering, 1954
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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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Enhanced membrane distillation : analytical and deionization applications
Membrane distillation (MD) is a newer technology that is being investigated for applications such as seawater desalination and concentration of fruit and sucrose solutions. The major advantage of MD over traditional thermal distillation is that it requires a substantially lower thermal energy …
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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
… 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 from …
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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
… 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 electrochemical principle …
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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 …
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Engineering efficient desalination systems: Materials development and systems analysis in capacitive deionization
… 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 limit of …
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Characterization and performance of vertically-aligned carbon nanotubes in capacitive deionization systems
… 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 and salt …
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An Experimental Study of Deionization in a Gas Containing Solid and Liquid Impurities
Made available in DSpace on 2014-12-09T17:13:34Z (GMT). No. of bitstreams: 1 6507091.pdf: 3350941 bytes, checksum: de132763403c21655d58540a404198ce (MD5) Previous issue date: 1965
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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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TCAQ-based polymer for electrochemically mediated separations
… literature values for capacitive or redox deionization systems.
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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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Selective Ion Separations Using Shock Electrodialysis
… lanthanides for catalytic processes; the extreme deionization of wastewaters, such as radioactive process water from nuclear power plants; and the recovery of lithium compounds and valuable metals for applications in mining and electronic waste recycling. These emerging trends have motivated the …
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Block Copolymer Derived Porous Carbon Fiber for Energy and Environmental Science
… undesirable ions such as salts and pollutants. Deionization or electrosorption is an electrochemical method for water purification via ion removal. I employed the PCFs as an electrode for deionization because of their high surface area and tunable pore size. Important for deionization, the …
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Nonlinear ion transport at high electric currents in shock electrodialysis and ion-intercalation memories
… porous media can lead to the formation of deionization shock, which is the key physics for shock ED. The main contribution of this thesis to shock ED is the modeling of multicomponent ion separation. In addition, in this thesis, it is proposed that the CP in multiphase ion-intercalation …
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Functionalized Polymeric Coatings for Enhanced Selective Removal of Ions in Electric-Field Driven Processes
… 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 prevent the …
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