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STUDY OF THE MECHANISM AND KINETICS OF OXIDATION OF Fe(II), Mn(II) and Ce(III) IONS BY LOW-TEMPERATURE PLASMA

Roman Yakushin

Abstract

The treatment of model solutions containing Fe(II), Mn(II) and Ce(III) salts in the range of metal ions concentrations of 20-500 mg/dm3 was carried out at the laboratory set of water purification by low-temperature plasma discharge during the registration of changes in the Red-Ox potential and pH of solutions, the ions concentration and the emission discharge spectrum. The ions concentration was measured by atomic absorption spectroscopy. The characteristic of discharge was measured with the methods of emission spectroscopy. Deciphering the emission spectra of the discharge with a liquid cathode showed the presence of OH-radical emission bands and molecular nitrogen N2, as well as lines of atomic hydrogen H and oxygen O. Electrical parameters of the discharge were also measured. The discharge occurred at atmospheric pressure in the air. During the experiments, data on the residual concentration of ions from the time of exposure of solutions, which are curves characteristic of the development of branched chain reactions, were obtained. To explain the observed regularities, a possible mechanism of the oxidation process of metal ions, including the branching stage, was assumed.

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