OXIDATION OF SUPERTOXICANTS IN A DIELECTRIC BARRIER DISCHARGE IN THE PRESENCE OF FERRATES

The oxidation processes under the action of ferrates and combined plasma action in the presence of ferrates on aqueous solutions of phenol and 2,4-dichlorophenol (with initial concentrations of organic compounds of 1-100 mg/l) were studied. The ferrate used in the process of cleaning model solutions was synthesized chemically by dissolving Fe(NO3)3·9H2O in an alkaline solution of NaClO4, followed by heating the resulting mixture. The ferrate concentration in the experiments was constant and amounted to 0.1 g/l. The volume ratio in the "processed solution - ferrate" systems was 10:1. When ferrates acted on the studied solutions, the destruction of 2,4-dichlorophenol proceeds more efficiently than in the case of using a dielectric barrier discharge (the destruction efficiency is 43% and 59%, respectively). For model phenol solutions, the destruction efficiency was the same (no more than 37%). Introduction of ferrate into the discharge zone of plasma resulted in significant increase in the destruction efficiency of the organic compounds under study (up to 86% for phenol and 92% for 2,4-dichlorophenol). It was shown that destruction of organic compounds is described by a 1st order kinetic equation, solution of which allowed estimating effective rate constants and rates of phenol and 2,4-dichlorophenol decomposition. The mechanism of synergistic effect of organic compound oxidation in the plasma-ferrate system is due to interaction of the following systems: 1) effect of dielectric barrier discharge on aqueous solutions, resulting in formation of active particles; 2) chemical reactions between FeO24- present in solution and active plasma particles; 3) reactions of oxidizing agents with organic compounds, which include direct oxidation with ferrate (VI) (with a redox potential of 2.20 V) and active particles formed in the combined process. For citation: Klipov N.V., Kvitkova E.Yu., Izvekova T.V., Gusev G.I., Le Thi Mai Huong, Gordina N.E., Gushchin A.A. Oxidation of supertoxicants in a dielectric barrier discharge in the presence of ferrates. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2025. V. 68. N 9. P. 126-133. DOI: 10.6060/ivkkt.20256809.7273.