Physicochemical Properties of Plasma — Solution Systems and Prospects for Their Use in Technology

Abstract

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Investigation of the opportunity for increasing the yield of hydrogen peroxide in plasma-solution systems

“…The action of the glowing discharge on the solution leads to reducing the pH of the electrolyte solutions [1]. However, in the case of using the electrolyte solutionalcohol mixtures, acidification of the solution as a result of the plasma treatment either proceeded to a much smaller degree or was not observed at all (Fig.…”

“…Glowing and sliding glowing discharges with the electrolyte electrodes related to them, as well as such discharges generated within the volume of the solution, act as the diaphragm and end ones [1,2]. The chemical processes initiated by the action of glowing discharge in a solution may proceed under the action of OH radicals in a small area of the direct effect of the discharge on the solution only (in the cathode spot); in the rest of the solution volume, the reactions proceed with the participation of hydrogen peroxide [1], and, hence, the increase in the yield of H 2 O 2 has a practical value. Formation of hydrogen peroxide under the action of glowing discharge was sufficiently studied in detail by us earlier [1,3,4].…”

“…The chemical processes initiated by the action of glowing discharge in a solution may proceed under the action of OH radicals in a small area of the direct effect of the discharge on the solution only (in the cathode spot); in the rest of the solution volume, the reactions proceed with the participation of hydrogen peroxide [1], and, hence, the increase in the yield of H 2 O 2 has a practical value. Formation of hydrogen peroxide under the action of glowing discharge was sufficiently studied in detail by us earlier [1,3,4]. The action of gliding discharge on a solution of electrolytes was investigated in [5][6][7].…”

“…Plasma-solution systems are very promising with respect to the development of effective methods of purification and sterilization of water, aqueous solutions, and products [1]. The mechanisms of such processes may be sufficiently complex, but, as a rule, they include reactions of OH radicals, which are generated in the solution under the action of plasma, and the product of their dimerization-hydrogen peroxide.…”

“…The yield of H 2 O 2 in a plasma-solution system obviously depends on both the discharge characteristics and the chemical composition and concentration of the electrolyte solution [1,2]. Some alcohols are known to be effective traps for OH radicals and are used in investigations of the processes of hydroxyl radicals and hydrogen peroxide formation in plasma-solution systems [8,9].…”