electrolysis

The accumulation of highly mineralized waters and brines in the mining-industrial regions of Ukraine carry a threat of salt pollution of underground and surface water sources. Low-waste processing of these waters is prevented by iron compounds, hydrogen sulfide and sulfur-containing organic compounds. The process of accumulation of iron compounds in brines and groundwater in the presence of hydrogen sulfide has been studied. Comparative calculations of the thermodynamic potentials of the corresponding reactions have been carried out.

The results of the electrochemical separation of sulfate and zinc chloride regeneration solutions; the pH influence on the electrolysis process and the extracting efficiency of metallic zinc are presented in the work. It has been established that electrolysis should be carried out in a two-cell electrolyzer to remove metals effectively.

Cadmium reduction in solutions at steady-state and pulse electrolysis has been studied. It was established that polarization results in cadmium formation at potentials 1 V larger than equilibrium one. In 0.25-1.0 molar solutions of CdCl2 concentrated depolarization leads to removement of the beginning of cadmium reduction by 0.3 V. Photographs of SEM are presented and effect of electrolysis characteristics on the morphology of cathode deposit is shown.

The electrolysis of TeCl4 solutions in dimethylsulfoxide, dimethylformamide and acetonitrile using soluble tellurium anodes has been investigated. At 313 K in 0.05 M TeCl4 over graphic undercoat the formation of compact tellurium deposit took place at cathode potentials less than 1.0 V and formation of dispersed deposit – at values more than 1.25-1.5 V. Using results of SEM researches it was established that dispersed tellurium formed

Polymer hydroxyethylcellulose matrix modification was made by mechanochemical method using copper containing nanoparticles, obtained by electrochemical reduction from copper sulphate solutions in water- ethanol medium. Interactions of copper containing nanoparticles with hydroxyethylcellulose were studies. Antimicrobial effect of the nanocomposites obtained was found.