The process of copper ions sorption by potassium humate has been studied. The possibility of using electrochemical extraction from solutions obtained after desorption has been demonstrated. By measuring the concentration of Cu2+ ions using atomic emission spectroscopy with inductively coupled plasma, it was established that to achieve sorption equilibrium between the solution and the sorbent, a contact duration of one hour is sufficient. The extraction of copper ions from sulfate solutions increases with increasing mass of added potassium humate; the maximum extraction degree of copper ions is 70.9%. Polarization measurements revealed inhibition of the rates of copper reduction in solutions obtained after desorption, in comparison with those in model solutions. Probably, the inhibition of the cathodic reduction process is associated with the formation of copper compounds with potassium humate, which are not active at the cathode. Experimental data on the electrochemical extraction of copper, obtained by galvanostatic coulometry, showed that during electrolysis, a deposit of copper metal occurs at the cathode. Electrolysis leads to a decrease in the concentration of copper ions to values close to the maximum permissible for industrial and drinking water. The process of electrochemical extraction of copper from such solutions is questionable from an economic point of view, but is promising for the treatment of copper-containing industrial wastewater, where considerations of environmental feasibility come to the fore.

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Electrochemical Сopper Extraction from Sulfate Solutions Obtained by Its Desorption from Compounds with Potassium Humate

  • Oleksii Pylypenko,
  • Inna Zaitseva,
  • Pavlo Karnozhitskiy,
  • Pavlo Karnozhitskiy,
  • Kateryna Rudneva

摘要

The process of copper ions sorption by potassium humate has been studied. The possibility of using electrochemical extraction from solutions obtained after desorption has been demonstrated. By measuring the concentration of Cu2+ ions using atomic emission spectroscopy with inductively coupled plasma, it was established that to achieve sorption equilibrium between the solution and the sorbent, a contact duration of one hour is sufficient. The extraction of copper ions from sulfate solutions increases with increasing mass of added potassium humate; the maximum extraction degree of copper ions is 70.9%. Polarization measurements revealed inhibition of the rates of copper reduction in solutions obtained after desorption, in comparison with those in model solutions. Probably, the inhibition of the cathodic reduction process is associated with the formation of copper compounds with potassium humate, which are not active at the cathode. Experimental data on the electrochemical extraction of copper, obtained by galvanostatic coulometry, showed that during electrolysis, a deposit of copper metal occurs at the cathode. Electrolysis leads to a decrease in the concentration of copper ions to values close to the maximum permissible for industrial and drinking water. The process of electrochemical extraction of copper from such solutions is questionable from an economic point of view, but is promising for the treatment of copper-containing industrial wastewater, where considerations of environmental feasibility come to the fore.