Abstract
New methods for extracting cobalt and zinc ions from sulfuric acid solutions, of silver and lead ions from nitric acid solutions, and of copper ions from hydrochloric acid solutions with liquid membranes based on di(2-ethylhexyl)phosphoric acid under conditions of galvanostatic electrodialysis with cathodic electrodeposition of metals are presented. Almost complete (93–100%) extraction from aqueous solutions with an initial concentration of metal salts of 0.01 M was achieved within 0.5–5.0 h of electrodialysis. The criterion of complete extraction of metal ions into a liquid membrane is an abrupt voltage rise in the galvanostatic mode of the process. The effects of the composition of the cathode solution, metal and acid concentration in the initial solution, composition of the organic liquid membrane, and current density of electrodialysis on the rate of extraction and electrodeposition of metal ions were studied. The optimum conditions for the processes were determined. Finely crystalline cobalt, silver, and lead cathode deposits with good adhesion to the electrode were obtained by electrodeposition from dilute perchloric acid solutions; high-quality copper coatings were obtained from sulfuric acid solutions; and zinc coatings, from hydrochloric acid solutions.
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Sadyrbaeva, T.Z. Membrane Extraction of Ag(I), Co(II), Cu(II), Pb(II), and Zn(II) Ions with Di(2-Ethylhexyl)phosphoric Acid under Conditions of Electrodialysis with Metal Electrodeposition. Theor Found Chem Eng 55, 1204–1220 (2021). https://doi.org/10.1134/S0040579521060105
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DOI: https://doi.org/10.1134/S0040579521060105