An electrical analogue for electrodialysis

Belfort, Georges; Guter, Gerald A.

doi:10.1016/s0011-9164(00)80104-6

Cited by 26 publications

(5 citation statements)

References 5 publications

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“…This theory is based on a boundary layer analysis of the steady convection–diffusion equation for an uncharged binary electrolyte, , where the flow is assumed to be fully developed and unidirectional and axial diffusion is neglected, as is usual for forced convection in straight pipes and channels. , Similar boundary layer approximations can be derived for membraneless flow batteries with forced convection over (selective) redox electrodes instead of IEMs . Extensions for turbulent flow, including effects of screen spacers to promote turbulent mixing, were incorporated in a general equivalent circuit model of ED by Belfort and Guter . Theoretical models were also used to calculate the pH profile and analyze ion selectivity (e.g., K + versus Ca 2+ , NO 3 – versus Cl – ) in ED.…”

Section: Electrokinetic Separationsmentioning

confidence: 99%

“…363 Extensions for turbulent flow, 364 including effects of screen spacers to promote turbulent mixing, 365 were incorporated in a general equivalent circuit model of ED by Belfort and Guter. 366 Theoretical models were also used to calculate the pH profile 367 and analyze ion selectivity (e.g., K + versus Ca 2+ , 348 NO 3 − versus Cl −368 ) in ED. In practical systems, the ideal diffusion-limited current is always exceeded when the applied voltage is sufficiently high, and possible mechanisms of this "overlimiting current" have been extensively studied in membrane science.…”

Section: Basic Principles Of Electrodialysismentioning

confidence: 99%

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Electrochemical Methods for Water Purification, Ion Separations, and Energy Conversion

et al. 2022

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Agricultural development, extensive industrialization, and rapid growth of the global population have inadvertently been accompanied by environmental pollution. Water pollution is exacerbated by the decreasing ability of traditional treatment methods to comply with tightening environmental standards. This review provides a comprehensive description of the principles and applications of electrochemical methods for water purification, ion separations, and energy conversion. Electrochemical methods have attractive features such as compact size, chemical selectivity, broad applicability, and reduced generation of secondary waste. Perhaps the greatest advantage of electrochemical methods, however, is that they remove contaminants directly from the water, while other technologies extract the water from the contaminants, which enables efficient removal of trace pollutants. The review begins with an overview of conventional electrochemical methods, which drive chemical or physical transformations via Faradaic reactions at electrodes, and proceeds to a detailed examination of the two primary mechanisms by which contaminants are separated in nondestructive electrochemical processes, namely electrokinetics and electrosorption. In these sections, special attention is given to emerging methods, such as shock electrodialysis and Faradaic electrosorption. Given the importance of generating clean, renewable energy, which may sometimes be combined with water purification, the review also discusses inverse methods of electrochemical energy conversion based on reverse electrosorption, electrowetting, and electrokinetic phenomena. The review concludes with a discussion of technology comparisons, remaining challenges, and potential innovations for the field such as process intensification and technoeconomic optimization.

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Section: Electrokinetic Separationsmentioning

confidence: 99%

Section: Basic Principles Of Electrodialysismentioning

confidence: 99%

Electrochemical Methods for Water Purification, Ion Separations, and Energy Conversion

et al. 2022

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“…The limiting current density i lim,K of a cation-exchange membrane introduced based on the Nernst-diffusion model is represented as Eq. (1), which is applied extensively for discussing the transport phenomena [6][7][8][9][10][11][12][13][14] …”

Section: Limiting Current Density Of An Ion-exchange Membranementioning

confidence: 99%

Limiting current density of an ion-exchange membrane and of an electrodialyzer

Tanaka¹

2005

Journal of Membrane Science

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“…As ions of the same charge move to the same electrode so their separation is closely related to the characteristics of the ion‐exchange membrane, especially its permselectivity in the system being used 15. Several papers have been published on the preferential transport of ions through an ion‐exchange membrane with electrodialysis in the absence of a complexing agent in which the permselectivities of both cation‐exchange and anion‐exchange membranes were studied 16–20. A metal ion separation process which combines the electrodialysis technique and complexing reactions has recently received attention 21–24.…”

Section: Introductionmentioning

confidence: 99%

Separation of strontium and cadmium ions from nitrate medium by ion‐exchange membrane in an electrodialysis system

Gasser

Nowier

2003

J of Chemical Tech & Biotech

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The separation of strontium and cadmium ions in a system containing ethylenediaminetetraacetic acid (EDTA) as a complexing agent has been studied using a three-compartment electrolytic cell. The results suggest that under the influence of an electric field, Sr ions were exclusively transported to the cathode as positively charged uncomplexed cations while cadmium ions removed from the middle compartment of the electrolytic cell migrated to the anode as negatively charged complexes. The effect of the EDTA complexing agent on the separation was studied within the pH range 2-4 at 100 mA (12.4 mA cm −2 ).

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An electrical analogue for electrodialysis

Cited by 26 publications

References 5 publications

Electrochemical Methods for Water Purification, Ion Separations, and Energy Conversion

Electrochemical Methods for Water Purification, Ion Separations, and Energy Conversion

Limiting current density of an ion-exchange membrane and of an electrodialyzer

Separation of strontium and cadmium ions from nitrate medium by ion‐exchange membrane in an electrodialysis system

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