0000000000088090

AUTHOR

Victor Nikonenko

showing 3 related works from this author

Modelling the transport of carbonic acid anions through anion-exchange membranes

2003

Electrodiffusion of carbonate and bicarbonate anions through anion-exchange membranes (AEM) is described on the basis of the Nernst � /Planck equations taking into account coupled hydrolysis reactions in the external diffusion boundary layers (DBLs) and internal pore solution. The model supposes local electroneutrality as well as chemical and thermodynamic equilibrium. The transport is considered in three layers being an anion exchange membrane and two adjoining diffusion layers. A mechanism of

Carbonic acidchemistry.chemical_classificationIon exchangeThermodynamic equilibriumGeneral Chemical EngineeringDiffusionBicarbonateInorganic chemistrySalt (chemistry)02 engineering and technology010402 general chemistry021001 nanoscience & nanotechnology01 natural sciences0104 chemical scienceschemistry.chemical_compoundsymbols.namesakeMembranechemistryElectrochemistrysymbols[CHIM]Chemical SciencesNernst equation0210 nano-technologyComputingMilieux_MISCELLANEOUSElectrochimica Acta
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How Electrical Heterogeneity Parameters of Ion-Exchange Membrane Surface Affect the Mass Transfer and Water Splitting Rate in Electrodialysis

2020

Electrodialysis (ED) has been demonstrated as an effective membrane method for desalination, concentration, and separation. Electroconvection (EC) is a phenomenon which can essentially increase the mass transfer rate and reduce the undesirable water splitting effect. Efforts by a number of researchers are ongoing to create conditions for developing EC, in particular, through the formation of electrical heterogeneity on the membrane surface. We attempt, for the first time, to optimize the parameters of surface electrical heterogeneity for ion-exchange membranes used in a laboratory ED cell. Thirteen different patterns on the surface of two Neosepta anion-exchange membranes, AMX and AMX-Sb, w…

Materials scienceSurface PropertiesAnalytical chemistry02 engineering and technology010402 general chemistry01 natural sciencesCatalysisArticleInorganic ChemistryDiffusion layerlcsh:ChemistrychronopotentiometryElectricityMass transferion-exchange membrane[CHIM]Chemical SciencesPhysical and Theoretical ChemistryelectrodialysisMolecular Biologylcsh:QH301-705.5SpectroscopyvoltammetryMembrane methodIon exchangeelectroconvectionOrganic ChemistryWaterMembranes ArtificialGeneral MedicineElectrochemical TechniquesElectrodialysis021001 nanoscience & nanotechnology6. Clean water0104 chemical sciencesComputer Science ApplicationsIon ExchangeMembranelcsh:Biology (General)lcsh:QD1-999Water splittingSurface modification0210 nano-technologyDialysissurface modificationFiltration
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Space charge effect on competitive ion transport through ion-exchange membranes

2002

A mathematical model of the competitive electro-transport of two counter-ions through an ion exchange membrane based on the Nernst-Planck and Poisson equations is developed. A three-layer system is considered: the membrane and two adjacent diffusion layers. Concentration profiles in the three layers, effective transport numbers as functions of the current and current-voltage characteristics are calculated. Deviation from the local electroneutrality in space charge region near the depleted solution/membrane interface is taken into account. It is shown that the space charge region grows with the voltage applied. However the fluxes of the competitive counter-ions at over-limiting currents are …

Ion exchangeChemistryMechanical EngineeringGeneral Chemical EngineeringAnalytical chemistryGeneral ChemistrySpace chargeQuantitative Biology::Cell BehaviorDiffusion layerMembraneDepletion regionChemical physicsGeneral Materials ScienceDiffusion (business)Ion transporterWater Science and TechnologyConcentration polarizationDesalination
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