Electrodialytic Extraction and Electrodeposition of Copper(II) in Systems with Di(2-Ethylhexyl)Phosphoric-Acid-Based Liquid Membranes

T. Zh. Sadyrbaeva T. Zh. Sadyrbaeva
Российский электрохимический журнал
Abstract / Full Text

A new process for the copper(II) ion extraction from hydrochloric acid solutions using di(2-ethyl-hexyl)phosphoric-acid-containing liquid membranes with tri-n-octylamine additives under electrodialysis conditions, accompanied with cathodic metal electrodeposition, is presented. The effects of hydrochloric acid and copper(II) concentrations in the feed solution, the organic liquid membrane and the cathodic aqueous solution compositions, as well as the electrodialysis current density and the electrode material, on the extraction and the metal ion electrodeposition rates is studied. The almost complete (96–100%) removal of copper(II) ions by the liquid membranes from the feed solution containing 0.01 M CuCl2 is shown being achieved after 0.5–3.0 h of electrodialysis; it is accompanied by a sharp rise in voltage when operating in the galvanostatic mode. The maximal obtained degree of the copper(II) back-extraction into the cathodic solution is 94%; the maximum electrodeposition degree, 74%. Dense, bright or matte cathodic copper deposits, well adhered to the electrode, are obtained during the electrodeposition from the sulfuric, hydrochloric, perchloric, nitric, and acetic acids’ dilute solutions.

Author information
  • Institute of Inorganic Chemistry, Riga Technical University, LV-1048, Riga, Latvia

    T. Zh. Sadyrbaeva

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