E. S. Bobkova

Mechanism of hydrogen peroxide formation in electrolytic-cathode atmospheric-pressure direct-current discharge

The kinetics of buildup of hydrogen peroxide in an atmospheric pressure direct-current discharge with a distilled-water cathode has been experimentally measured. A kinetic reaction scheme has been proposed and analyzed to calculate peroxide concentrations in accordance with experimental data.

Destruction of Sulfonol in Its Aqueous Solutions by Contact Glow Discharge Treatment: 1. Product Formation Kinetics

Degradation of the anionic surfactant Sulfonol (sodium alkylbenzenesulfonate) in its aqueous solutions acting as a liquid cathode of atmospheric-pressure dc discharge in air has been studied. The products of plasma-chemical decomposition of Sulfonol in the liquid phase have been identified. The kinetic characteristics of the formation of products of plasma-chemical reactions at a substrate concentration of 5 × 10−3 g/L (0.014 mmol/L) and a discharge current of 40 mA have been determined.

Mechanism of phenol degradation processes induced by direct-current atmospheric-pressure discharge in air

The phenol degradation kinetics and the buildup kinetics of the products hydroxyphenols, nitrophenols, carboxylic acids, and formaldehyde in electrolytic-cathode direct-current discharge have been studied, as well as the formation of nitric acid. On the basis of the results, a scheme of the processes has been proposed; calculations according to this scheme describe well the experimental data on the degradation kinetics of phenol and the formation/decay kinetics of its transformation products.

Degradation kinetics of phenol and its decomposition products in the electrolyte cathode of direct-current atmospheric-pressure discharge

The degradation kinetics of phenol and the formation kinetics of its decomposition products in the liquid cathode (distilled water) of direct-current atmospheric-pressure discharge in air have been experimentally measured. The processes occurring in the liquid phase have been simulated on the basis of the previously proposed reaction kinetics scheme complemented by phenol decomposition reactions and the formation/decay reactions of its degradation products.

Decomposition of Aqueous Solution of Acetic Acid under the Action of Atmospheric-Pressure Dielectric Barrier Discharge in Oxygen

Decomposition of an aqueous solution of acetic acid under the action of an atmospheric-pressure dielectric barrier discharge in oxygen in a flow-through reactor was studied. A mechanism of chemical reactions is suggested, which describes the decomposition of the acid and formation of the reaction products observed.

Kinetics of DC discharge-induced degradation of phenol in aqueous solutions

The influence of discharge parameters and phenol concentration on the kinetics of phenol degradation in an aqueous solution by the action of direct-current discharge with an electrolyte cathode has been studied. The degradation rate constants of phenol as a function of its initial concentration at different discharge parameters and volumes of the treated solution have been obtained. The energy efficiency of the degradation process has been determined, and the dependences of the rate constants on the concentration, the discharge current, and the volume of the solution have been explained.

Destruction of sulfonol in its aqueous solutions by contact glow discharge treatment: 2. Mechanisms and kinetic simulation

A mechanism for the degradation of Sulfonol in its aqueous solutions acting as a liquid cathode of atmospheric-pressure dc discharge in air and for the formation of the products has been proposed, and the chemical kinetics of the degradation processes has been numerically simulated.

Reduction of chromium(VI) in aqueous solution by treatment with direct-current discharge at atmospheric-pressure in air

The kinetics of reduction of Cr(VI) by treating its aqueous solution in atmospheric pressure dc discharge in air has been studied at the discharge current range of 20–80 mA and the concentration range of 1.25–12.5 mg/L. The solution has served as the discharge cathode. It has been shown that the discharge treatment leads to a decrease in the Cr(VI) concentration to its steady-state value, with the latter depending on the discharge current and the initial concentration of the solution. The effective rate constants of the forward and reverse processes have been determined, the energy efficiency of the process has been evaluated, and possible mechanisms of the reactions involved have been discussed.

Influence of parameters of oxygen atmospheric-pressure dielectric barrier discharge on the degradation kinetics of sulfonol in water

The kinetics of the degradation of Sulfonol and the formation of its degradation products by the action of oxygen atmospheric-pressure dielectric barrier discharge on an aqueous solution at discharge powers of 0.4–4 W have been measured. It has been shown that the degradation products are carboxylic acids and aldehydes in the liquid phase and carbon dioxide in the gas phase. The energy efficiency of the degradation has been found to be (4.4–12.7) × 10−3 molecule per 100 eV of input energy. Mechanisms for the processes have been proposed.

Features of phenol degradation in aqueous solution in dielectric-barrier discharge in oxygen

The kinetics of phenol degradation in aqueous solution in an atmospheric-pressure dielectric-barrier discharge in oxygen at different power inputs to the discharge has been investigated. On the basis of these data, the energy yields of degradation and their dependence on the discharge parameters and initial concentration have been determined. The problem of comparing the energy efficiencies of different types of discharges has been discussed. The decomposition of phenol has been shown to result in the formation of carboxylic acids and aldehydes in the solution and carbon dioxide in the gas phase.