Destruction of 2,4-Dichlorophenol in Water Solution Using a Combined Process of Sorption and Plasma Exposure to DBD
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Destruction of 2,4‑Dichlorophenol in Water Solution Using a Combined Process of Sorption and Plasma Exposure to DBD Andreiy A. Gushchin1 · Grigoriy I. Gusev1 · Vladimir I. Grinevich1 · Tatiana V. Izvekova1 · Elena Yu. Kvitkova1 · Vladimir V. Rybkin2 Received: 20 May 2020 / Accepted: 6 October 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The results of studies of the decomposition of 2,4-dichlorophenol (2,4-DCP) in its aqueous solution under the action of atmospheric pressure DBD in an oxygen flow are presented. A new reactor design was used in which the discharge zone was filled with a sorbent (diatomite). It was found that the kinetics of decomposition obeys a first-order kinetic equation for the concentration of 2,4-DCP. The presence of an adsorbent significantly improves the parameters of the decomposition process. Decomposition rates, rate constants and energy efficiency are doubled. So, at a specific discharge power of 1.8 W/cm3 in the presence of a sorbent, the rate constant was ~1 s−1, and without it, ~0.5 s−1. The energy efficiency was 0.031 and 0.016 molecules per 100 eV, respectively. The parameters of the treated solution are improved in terms of its potential toxicity. The concentrations of the main decomposition products (aldehydes, carboxylic acids) in the presence of a sorbent are significantly less than without it. This is due to an increase in the rate of conversion of these products into carbon dioxide molecules. It was also shown that the decomposition of one 2,4-DCP molecule leads to the formation of two chloride ions in solution, and the ozone formed in the discharge does not significantly affect the destruction process. Keywords 2,4-dichlorophenol · Dielectric barrier discharge · Decomposition · Kinetics
Introduction Chlorinated phenols are groups of organic pollutants that are widespread in water bodies, soils [1], filtrates from landfills [2], which are highly toxic compounds, and, most importantly, resistant to biodegradation [3, 4], which leads to difficulties when treating contaminated water [3]. For this reason, plasma-chemical methods for the decomposition of such compounds are very promising. * Vladimir V. Rybkin [email protected] 1
Department of Industrial Ecology, Ivanovo State University of Chemistry and Technology, Sheremetiev ave., 7, Ivanovo 153000, Russia
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Department of Microelectronic Devices and Materials, Ivanovo State University of Chemistry and Technology, Sheremetiev ave., 7, Ivanovo 153000, Russia
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Plasma Chemistry and Plasma Processing
In [5], the destruction of 2,4-dichlorophenol (2,4-DCP) in its aqueous solution in the DBD reactor was studied. The effect of the type of plasma-forming gas, the applied voltage and the pH value on the destruction process was studied. Intermediates resulting from the degradation of 2,4-DCP were identified using GC–MS and a mechanism of degradation processes was proposed. The study showed that DBD using different plasma-forming gases (Ar and N 2) can quickly and effi
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