Catalysts based on carbon material «Sibunit» for deep oxidation of organic toxicants in aqueous solutions. (2) Liquid-phase peroxide oxidation in the presence of oxidized carbon catalysts

For the first time we studied the effect of the surface chemical composition of the carbon catalysts on the basis of carbon material series «Sibunit» («Sibunit-4»), prepared by oxidative treatment by various oxidants on their catalytic properties in liquid-phase oxidation of formic acid by hydrogen peroxide. We detect the activity of «pure» carbon samples in the decomposition of hydrogen peroxide and oxidation of organic substrates by hydrogen peroxide, which decreases with increasing number of carboxyl and lactone groups on the surface of the carbon catalyst. The rates of these processes in the presence of carbon catalysts are lower than in the presence of even small quantities of homogenous ion Fe3+. It is shown that the carbon samples, depending on the ratio of surface carboxyl and lactone groups and Fe3+ ions in the reaction solution, accelerate, or on the contrary, inhibit the reaction of peroxide oxidation of organic substrates catalyzed by iron ions. Possible mechanisms of acceleration and inhibition of peroxidation reactions of carbon catalysts are discussed. Established influence of the chemical properties of the carbon catalysts surface should be taken into account in the development of catalysts and processes for the oxidative treatment of industrial effluents.

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