Phenol decomposition in water cathode of DC atmospheric pressure discharge in air

Bobkova, E. S.; Krasnov, Dmitriy S.; Sungurova, A. V.; Рыбкин, В. В.; Choi, Ho‐Suk

doi:10.1007/s11814-015-0292-7

Cited by 18 publications

(8 citation statements)

References 43 publications

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“…Really, the formation of nitrite and nitrate ions was observed in the study [32] for the same discharge as presented here. The acidity change (Fig.…”

Section: Kinetic Model Kinetic Model For Aqueous Solutionssupporting

confidence: 64%

Kinetics and Mechanism of Cr(VI) Reduction in a Water Cathode Induced by Atmospheric Pressure DC Discharge in Air

Shutov

Sungurova

Choukourov

et al. 2016

Plasma Chem Plasma Process

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The process of reduction of Cr 6? ions (solution of potassium dichromate, K 2 Cr 2 O 7 ) in a water cathode was studied during a DC discharge in air. The concentration range of Cr 6? was (5.7-19) 910 -5 mol/l and discharge current range was 20-80 mA. Cr 6? ions were shown to be reversibly reduced under a discharge action. The equilibrium degree of reduction increased with increasing initial concentration of the solution at fixed discharge current. At fixed initial concentration the reduction degree increased with increasing discharge current. The reduction degrees so obtained were 0.34-0.84. A kinetic scheme of the processes taking place in a solution was proposed. The calculated data obtained as a result of application of this scheme described well the experimental results on Cr 6? kinetics. The main processes of Cr 6? reduction and Cr 3? oxidation were revealed. HO 2 Á radicals and hydrogen peroxide were shown to be responsible for Cr 6? reduction whereas Á OH radicals and O 2 molecules provide the reverse process of Cr 3? oxidation to Cr 6? . The mechanism of action of phenol additives improving the process efficiency is discussed. The efficiency of phenol action as a radical scavenger was shown to be determined with its mass-transfer to the reaction area rather than chemical reaction rate.

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“…Really, the formation of nitrite and nitrate ions was observed in the study [32] for the same discharge as presented here. The acidity change (Fig.…”

Section: Kinetic Model Kinetic Model For Aqueous Solutionssupporting

confidence: 64%

Kinetics and Mechanism of Cr(VI) Reduction in a Water Cathode Induced by Atmospheric Pressure DC Discharge in Air

Shutov

Sungurova

Choukourov

et al. 2016

Plasma Chem Plasma Process

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“…These properties were previously evidenced by microbiologists [60,61]. Rybkin et al [62] recently reported on the nitration of phenol by DBD discharge. The occurrence of such reactions in organic pollutant abatement, as well as in bacterial inactivation, suggests the formation of ions (e.g.…”

Section: Peroxynitrite and Peroxynitrous Acidsupporting

confidence: 52%

Chemical Effects of Air Plasma Species on Aqueous Solutes in Direct and Delayed Exposure Modes: Discharge, Post-discharge and Plasma Activated Water

Brisset

Pawłat

2015

Plasma Chem Plasma Process

171

121

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The chemical interaction between non-thermal plasma species and aqueous solutions is considered in the case of discharges in humid air burning over aqueous solutions with emphasis on the oxidizing and acidic effects resulting from formed peroxynitrite ONOO -and derived species, such as transient nitrite and stable HNO 3 . The oxidizing properties are mainly attributed to the systems ONOOONOOH tentatively splits into reactive species, e.g., nitronium NO ? and nitrosonium NO 2 ? cations. NO ? which also results from both ionization of Á NO and the presence of HNO 2 in acidic medium, is involved in the amine diazotation/nitrosation degradation processes. NO 2 ? requires a sensibly higher energy than NO ? to form and is considered with the nitration and the degradation of aromatic molecules. Such chemical properties are especially important for organic waste degradation and bacterial inactivation. The kinetic aspect is also considered as an immediate consequence of exposing an aqueous container to the discharge. The relevant chemical effects in the liquid result from direct and delayed exposure conditions. The so called delayed conditions involve both post-discharge (after switching off the discharge) and plasma activated water. An electrochemical model is proposed with special interest devoted to the chemical mechanism of bacterial inactivation under direct or delayed plasma conditions.

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“…Therefore, the relationship between the rates of reactions (1) and (2-4) can determine the behaviour of peroxide concentration [12]. Such a course of events seems to describe the simplest situation, but it does not always fit the experimental observations.…”

Section: Peroxide Formationmentioning

confidence: 99%

“…Plasma treatment realised in various forms of plasma discharge is a very effective attractive alternative to the methods of solution treatment mentioned above. Plasma discharge was successfully used to treat wastewaters contaminated with herbicides/pesticides, decompose pharmaceuticals, surfactants, sulfonol, phenol and textile dyes [9][10][11][12]. Many of the researches have focused on the decomposition of organic compounds which are key contaminants in source water.…”

Section: Introductionmentioning

confidence: 99%

Low-Pressure Discharge Plasma Treatment of Aqueous Solutions with Mn, Cr and Fe

Пивоваров¹,

Derkach²,

Скіба³

2019

ChChT

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The effect of low-pressure glow discharge on the formation of peroxide and the degree of oxidation of Mn, Cr and Fe was studied in the aqueous solutions of different compounds. The plasma treatment causes the reduction of Mn(VII) through Mn(IV) to Mn(II), Cr(VI) to Cr(III) and oxidation of Fe(II) to Fe(III). Among other reactive species, peroxide formed under the action of plasma treatment takes an active part in redox reactions. The concentration of peroxide usually increases with treatment time, but its presence is detected only after completion of active redox processes.

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Phenol decomposition in water cathode of DC atmospheric pressure discharge in air

Cited by 18 publications

References 43 publications

Kinetics and Mechanism of Cr(VI) Reduction in a Water Cathode Induced by Atmospheric Pressure DC Discharge in Air

Kinetics and Mechanism of Cr(VI) Reduction in a Water Cathode Induced by Atmospheric Pressure DC Discharge in Air

Chemical Effects of Air Plasma Species on Aqueous Solutes in Direct and Delayed Exposure Modes: Discharge, Post-discharge and Plasma Activated Water

Low-Pressure Discharge Plasma Treatment of Aqueous Solutions with Mn, Cr and Fe

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