Current–voltage characteristics in a hybrid electrodialysis–ion exchange system for the recovery of cesium ions from ammonium molybdophosphate-polyacrylonitrile

A hybrid electrodialysis–ion exchange (EDIX) method was investigated for the recovery of cesium from cesium-sorbed ammonium molybdophosphate-polyacrylonitrile (AMP-PAN) ion exchange resin. Concentration polarization was studied by observing current–voltage (I–V) characteristics of a three compartmen...

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Bibliographic Details
Published in:Desalination 2014-11, Vol.353, p.8-14
Main Authors: Mahendra, Ch, Satya Sai, P.M., Anand Babu, C.
Format: Article
Language:English
Subjects:
Anolytes
Applied sciences
Cesium
Chemical engineering
Concentration polarization
Constraining
Current density
Electrodialysis
Electrolytes
Electrolytic cells
Exact sciences and technology
Flow rate
Ion exchange
Ion exchangers
Limiting currents
Membrane separation (reverse osmosis, dialysis...)
Pollution
Recovery
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Summary:A hybrid electrodialysis–ion exchange (EDIX) method was investigated for the recovery of cesium from cesium-sorbed ammonium molybdophosphate-polyacrylonitrile (AMP-PAN) ion exchange resin. Concentration polarization was studied by observing current–voltage (I–V) characteristics of a three compartment electrodialysis cell containing AMP-PAN in the middle compartment. The effect of process parameters such as flow rates of electrolytes and anolyte concentration on the current–voltage behavior was examined. Limiting currents, determined using Cowan plots, increased with electrolyte flow rates and anolyte concentration. In the present study, limiting current density (LCD) was measured for the electrodialysis system as a function of linear velocity and anolyte concentration using the equation ilim=aCub. Coefficients a and b for relating limiting current density and flow velocity were evaluated for different anolyte concentrations and electrolyte flow rates. Application of overlimiting currents resulted in lower recovery of cesium from AMP-PAN. During continuous operation of the cell, the onset of concentration polarization was detected by observing the pH of the acidic catholyte which turned to alkaline. •I–V curves of EDIX for Cs recovery showed three regions as in electrodialysis.•Limiting currents increased with electrolyte flow rates and anolyte concentrations.•Operation at 80% LCD gave highest Cs recovery.•Catholyte pH changed to alkaline at overlimiting currents, serving as indicator.
ISSN:0011-9164
1873-4464
DOI:10.1016/j.desal.2014.08.025