ELECTRO RECOVERY OF TELLURUM IONS FROM NON-AQUEOUS N-N DIMETHYLFORMAMIDE ELECTROLYTE

Abstract

The work presents studies of the mechanism of recovery of tellurium ions from non-aqueous N N dimethylformamide. For this, linear and cyclic current-voltage polarization curves have been recorded. The influence on the process of the concentration of tellurium ions, change of potential sweep rate and temperature has been investigated. By recording linear polarization curves, it has been established that the reducing process of tellurium ions is controlled by their diffusion to the cathode surface. The influence of the concentration of its ions in the electrolyte, the rate of change of the potential and the temperature on the tellurium deposition process was studied. By recording the cyclic polarization curve, the potential area where tellurium ions precipitate and its anodic dissolution occurs is determined. It was determined that the increase in the concentration of tellurium ions and the temperature increases the speed of the reduction process of tellurium, and the reduction process itself is controlled by the diffusion of tellurium ions on the cathode surface. To confirm the obtained data, polarization curves have been recorded on a rotating platinum disk electrode. Data received, exactly the linear dependence of ip on the electrode rotation speed (ω) to the power of 0.5, confirms that, that the process of reduction of tellurium electrodes in non-aqueous N-N dimethylformamide is controlled by diffusion polarization.