Dihydric Phenol Photochemical Oxidation in Aqueous Solutions using the Persulphate

Abstract

Dihydric phenols are the highly toxic ecotoxicants. Due to their high detection frequency and potential risk to the aquatic environment and human health, special attention is being paid to methods of their disposal. High-intensity oxidation processes could become the effective methods in removing phenols from the aqueous medium due using the free radicals formation. The paper presents kinetic patterns of resorcinol, pyrocatechol and hydroquinone photooxidation under simultaneous exposure to ultraviolet radiation and peroxodisulfate. Using the dihydric phenols in photo destruction as an example, it was established that additional introduction of a strong oxidizing agent, i.e., peroxodisulfate, led to appearance of a coupled mechanism in the radical chain reactions. That caused formation of the synergistic mechanism. It was established that efficiency of the diatomic phenols photooxidation reached 99.9 %. Complete photooxidation period and rate constants of the catechol, resorcinol and hydroquinone destruction were calculated under the synergistic action (ultraviolet radiation/peroxodisulfate) at various micro-doses of the peroxodisulfate. Peroxodisulfate introduction into the system most effectively affected the degree and depth of the aqueous solutions photo degradation with pyrocatechol, resorcinol and hydroquinone. The obtained kinetic data are characterizing the phenols photochemical degradation processes and could be introduced in selecting the main criteria for scaling the process in pilot testing

Please cite this article in English as:

Karataeva P.R., Ivantsova N.A., Dubrovina V.N. Dihydric phenol photochemical oxidation in aqueous solutions using the persulphate. Herald of the Bauman Moscow State Technical University, Series Natural Sciences, 2023, no. 5 (110), pp. 122--136 (in Russ.). DOI: https://doi.org/10.18698/1812-3368-2023-5-122-136

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