Electrodeionization of low-concentrated multicomponent Ni2+-containing solutions using organic–inorganic ion-exchanger

Organic–inorganic ion-exchangers have been obtained by modification of gel-like flexible resin with zirconium hydrophosphate, which form both single and aggregated nanoparticles in the polymer matrix. Insertion of the inorganic constituent into the resin up to 40 mass % was found to increase electri...

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Bibliographic Details
Published in:Desalination 2014-06, Vol.342, p.43-51
Main Authors: Dzyazko, Yu.S., Ponomaryova, L.N., Rozhdestvenskaya, L.M., Vasilyuk, S.L., Belyakov, V.N.
Format: Article
Language:English
Subjects:
Aggregates
Constituents
Electrical resistivity
Electrodeionization
Electrodialysis
Ion transport
Ion-exchange membrane
Ion-exchange resin
Nanoparticles
Organic–inorganic ion-exchanger and membrane
Polymers
Resins
Resistivity
Zirconium
Zirconium hydrophosphate
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Summary:Organic–inorganic ion-exchangers have been obtained by modification of gel-like flexible resin with zirconium hydrophosphate, which form both single and aggregated nanoparticles in the polymer matrix. Insertion of the inorganic constituent into the resin up to 40 mass % was found to increase electrical conductivity of the resin from 0.2 to 0.7Ω−1m−1. Total ion-exchange capacity also increases from 600 to 1800molm−3. The organic–inorganic ion-exchanger with the highest amount of the inorganic constituent was used for electrodeionization processes to remove Ni2+ from low-concentrated solutions containing also hardness ions and organic substances. The “once-through” processes have been developed based on ion transport investigation under variation of the initial pH, concentration, and flow velocity of the solution being purified. Residual Ni2+ content in the solution was 0.7–0.9ppm, the energy consumptions have been estimated 0.4–0.7kWh per 1m3. The organic–inorganic ion-exchanger was found to demonstrate stability against fouling with organic substances as opposed to the unmodified resin. [Display omitted] •Composite ion exchanger was obtained by modification of flexible cation-exchange resins with zirconium phosphate.•This material was applied to electrodeionization processes.•The method of Ni2+ removal from combining solutions, which contain also Ca2+ and Mg2+, has been developed.
ISSN:0011-9164
1873-4464
DOI:10.1016/j.desal.2013.11.030