Ion-exchange Assisted Electrodialysis For Copper Ions With Zirconium Phosphate Usage
ION-EXCHANGE ASSISTED ELECTRODIALYSIS FOR COPPER IONS WITH ZIRCONIUM PHOSPHATE USAGE
V. Belyakov1, T. Maltseva1, S. Vasiluk1, F. Lapicque2
1Institute of General and Inorganic Chemistry, Ukrainian National Academy of Sciences, Palladina avenue 32-34, 03680 Kiev, Ukraine
e-mail: membrane@ionc.kar.net
2CNRS, ENSIC 47, rue Deglin F-54042 Nancy France,
e-mail: lapicque@ensic.inpl-nancy.fr
This thesis presents the progress obtained at IGIC, Kiev and CNRS in Nancy, for removal of copper from waste waters. Sorbent ZrPh-205 was prepared at IGIC, then tested in Nancy, for the three-month trainee period of S.Vasiluk. The behaviour of the sorbent for adsorption of cupric species, its regeneration by an electric field application, and for the purification of Cu2+ containing waters, was compared with that exhibited by Dowex HCR-S resins.
For experiments a vertical cell consisting of three compartments: was used the central compartment being 10×15×100 mm3 in dimensions, contained the ion-exchange particles, whereas the cathode and anode compartments which were filled with electrolyte solutions. The compartments were separated using Nafion-117 membrane on the anode and cathode side. Resin (15 cm3), partially loaded with cupric ions by batch impregnation, was placed in the central compartment of the cell for each run.
The commitment of IGIC and CNRS concerned investigations of the capacity of two sorbents toward purification of Cu-containing solutions by ion exchange assisted electrodialysis. Both regeneration of sorbents previously loaded and water purification were studied using two sorbents. In spite of the promising copper ions capacity exhibited by Ukrainian ZrPh-205 grade, and by its possible desorption with an electrical field. The tested commercial resin with a 8 % degree of cross-linking is also suitable for experimental using in a purification cell.
The experiments done should be confirmed and completed by further tests, for the increase of the current yield: the applied
voltage/current is a significant parameter and has to be selected in comparison with the limiting current through the membrane. Average data obtained for each sorbents (respectively Dowex HCR-S and ZrPh-205): current efficiency 13.14 % and 3.55 %; degree of purification 75 % and 97 %, power imputs 150 W and 420W.
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