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INFLUENCE OF DIELECTRIC-BARRIER DISCHARGE ON THE VALENCE STATE OF IRON AND NICKEL IN AQUEOUS SOLUTIONS
Abstract
Dielectric barrier discharge is low-temperature plasma generated in cases with an dielectric material between the electrodes. The demanding applied task of water treatment is the removal of heavy metal ions, including iron (Fe) and nickel (Ni), ions, from aqueous solutions. The authors of the paper designed a plasma reactor that allows the dielectric-barrier discharge treatment of a solution near the surface of the liquid in the flow-through mode, so that this method can be used for technological purposes. The influence of dielectric-barrier discharge treatment on the valence state of iron (Fe) and nickel (Ni) ions in aqueous solutions of their salts has been studied. The efficiency of recovery of sparingly soluble compounds of iron (Fe) during the treatment of model solutions in a special designed plasma-chemical reactor has been evaluated. The change in the valence state of nickel (Ni) and the redox potential of the system under the action of an electric discharge have been studied. As shown in the article, treatment of this kind affects the valence state of Fe and Ni ions in water. In most cases, they are oxidized to higher forms of oxides and hydroxides, which in turn can be easily removed by filtration. The concentration of hydrogen peroxide in the aqueous solution at dielectric-barrier discharge contact with the liquid surface was determined. The possibility of hydrogen peroxide formation in water by barrier discharge treatment has been shown, and the change in the redox potential of the system has been analyzed.
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