Organic dye removal from aqueous solution by glidarc discharges

Burlică, Radu; Kirkpatrick, Mike; Finney, W.C.; Clark, Ronald J.; Locke, Bruce R.

doi:10.1016/j.elstat.2004.05.007

Cited by 104 publications

(68 citation statements)

References 5 publications

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“…These two properties of plasma treated water (acidity and oxidation) are indicative of plasma acid's potential application in industrial and medical setting for surface cleaning or inactivation of bacteria, proteins, etc. Although the low pH values of water after plasma treatment has been shown before, [9,10,[20][21][22][23]28] it is still not clear what the source of acidity was. It was previously suggested that the acidity of plasma treated water might be the result of nitric and nitrous acid formation.…”

Section: Discussionmentioning

confidence: 99%

“…[16][17][18] Although ozone is a good oxidizer, direct exposure of deionized water to plasma, which contains not only ozone but also charged species, reactive oxygen species, and radicals, [19] creates a much stronger oxidizer than ozone. [20][21][22][23] It has been reported that water treated by various plasma discharges becomes acidic, [9][10][11][20][21][22][23][24] which leads to antimicrobial effects. [9][10][11][24][25][26][27] The important question is which acid is created in water treated by plasma.…”

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confidence: 99%

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Retraction: Plasma Acid: Water Treated by Dielectric Barrier Discharge

Shainsky

Dobrynin

Ercan

et al. 2012

Plasma Processes & Polymers

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It is demonstrated that direct exposure of deionized water to a dielectric barrier discharge (DBD) plasma creates an acid (pH % 2) and is in fact, a strong oxidizer (providing, e.g., peroxidation of a cell membrane). This study addresses the question: which acid is created in water by plasma treatment. Two major possibilities are considered: nitric/nitrous acid and an acid which consist of a hydrogen cation (H þ ) and a superoxide anion (O À 2 ), which, for the lack of a better term, we call plasma acid. The presence of nitric/nitrous acid in the water after plasma treatment in air is confirmed, although the observed pH % 2 cannot be completely explained by the production of nitric acid. Moreover, experiments with oxygen-plasma treatment of water also lead to high acidity, without production of nitrogen based acids at all. Therefore, O À 2 , the conjugate base of the plasma acid, is at least partially responsible for both lowering of the pH and the increase in the oxidizing power of the solution. Experiments indicate that peroxides such as H 2 O 2 and O À 2 , together with an acidic environment are likely to be responsible for the oxidation properties of the plasma treated water. This plasma acid remains stable for at least a day, depending on the gas where plasma is generated, but the effect is temporal. Existence of a temporal and stable oxidizer created using the plasma treatment of pure water not only raises interesting scientific questions and possibilities, but is also likely to provide many applications in situations where direct plasma treatment may be difficult to achieve. Plasma Process. Polym. 2012,

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Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

Retraction: Plasma Acid: Water Treated by Dielectric Barrier Discharge

Shainsky

Dobrynin

Ercan

et al. 2012

Plasma Processes & Polymers

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“…Il est ainsi possible, entre autres applications et en opérant à la pression atmosphérique, de dégrader totalement des solvants d'extraction usés tels que le tributylphosphate ou des hydrocarbures aliphatiques (MOUSSA et BRISSET, 2003) -qu'ils soient ou non chlorés (FANMOE et al, 2003). Une autre application réside dans la diminution notable (ABDELMALEK et al, 2004;BURLICA et al, 2004) de la teneur en solutés organiques polluants d'effluents industriels (des colorants de l'industrie textile par exemple). Les exemples de molécules cibles dégradées par décharge électrique sont nombreux et concernent des composés à structure aliphatique ou aromatique.…”

Section: Cadre De L'étude Et Objectifsunclassified

Destruction plasmachimique d’urée et de thiourée par décharge électrique à pression atmosphérique

Doubla

Tsagou-Sobze

Moussa

et al. 2007

rseau

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Le traitement à la pression atmosphérique de solutions aqueuses d’urée et de thiourée par plasma d’arc rampant en atmosphère d’air humide conduit à la dégradation totale de ces composés. Les cinétiques globales d’ordre nul ont des constantes voisines proches de 3•10‑6 s‑1. Le procédé met en jeu les espèces actives créées dans la décharge, les radicaux OH et NO, responsables des caractères chimiques principaux du plasma : oxydation du fait de la présence de OH (E°OH H2O = 2,85 V/ENH) et acidification, provenant de la formation d’acides nitreux et nitrique en solution. Ces résultats sont relatifs à des molécules modèles, mais suggèrent l’extension du procédé à la dégradation de molécules toxiques et d’effluents industriels soufrés.Electric discharges in humid air (i.e., a gliding arc discharge at atmospheric pressure and quasi-ambient temperature) are considered in the context of evaluating new techniques for pollution abatement. An electric discharge in a gas under specific conditions gives rise to a plasma, which involves activated gas species with enhanced reactivity. The main chemical properties of a discharge in humid air are attributed to NO and OH radicals formed in the discharge, which are able to react with solutes at the plasma/liquid interface. These activated species are formed in advanced oxidation processes and are respectively responsible for acid and oxidizing effects in the target solution: NO gives rise to nitrous and nitric acids, and OH is strongly oxidising [E°(OH/H2O) = 2.85 V/NHE].To examine the degradation power of the plasma treatment on molecules of the same family and to evaluate the ability of the gliding arc system to oxidize sulphur-containing solutes (2 x 10‑3 M) in batch conditions, aqueous urea and thiourea were selected as suitable target solutions. The solutes were completely degraded within 180‑200 minutes of treatment and the concentrations decreased linearly with increasing exposure times in the discharge. This trend accounts for overall zero-order kinetic schemes with the relevant rate constants of kurea = 5.28 x 10‑6 s‑1 and kthiourea = 2.03 x 10‑6 s‑1.The evolution of solutes with time was followed by total organic carbon (TOC) measurements for urea, and by the conductometric titration of the sulphate ions formed in the case of thiourea. Spectrophotometric measurements of the treated solutions at the solute absorption peaks were found to be unsuitable for analysis purposes due to the formation of nitrite/nitrate ions which absorb in the same wavelength range.The extension of a gliding arc system from the laboratory level to an industrial scale for pollution abatement of industrial effluents is considered

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“…The • OH radicals are responsible for the decontamination and strong oxidizing properties, whereas the NO • radicals are known as parent molecules for acid derivatives HNO 2 and HNO 3 , which induce acid effect [22][23][24][25][26]. Based on the advantages of electrical discharges in gas-liquid medium and the characteristics of humid air gliding arc discharge, several gas-liquid gliding arc discharge plasma reactors have been devised [27][28][29][30]. Wastewater is sprayed directly into the plasma zone formed between two electrodes through an atomizing nozzle in the gas-liquid gliding arc plasma reactor.…”

Section: Introductionmentioning

confidence: 99%

Degradation of 4-Chlorophenol using a Gas–Liquid Gliding Arc Discharge Plasma Reactor

Du¹,

Yan

Chéron

2007

Plasma Chem Plasma Process

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The gas-liquid gliding arc discharge plasma is used directly to study degradation and dechlorination of 4-Chlorophenol (4-CP) in solution. The typical AC waveforms of discharge voltage and current revealed that the discharge behavior was not definitely periodic. The chemical oxygen demand (COD) abatement of 4-CP solution with stainless steel electrode is higher than that with aluminum or brass electrode; When air was used as carrier gas the COD abated from 1,679.2 to 190 mg/L (i.e., 88.68% abatement) after 76 min plasma treatment; Increasing gas-liquid mixing rate could also increase the degradation of 4-CP; adding appropriate amounts of Fe 2+ or iron chips to the solution were found to be favorable for 4-CP degradation. The main intermediates of 4-CP degradation are p-benzoquinone, hydroquinone, 4-chlorocatechol, p-chloronitrobenzene, and ring cleavage products (acetic acid, glycol, propanone, and others). Furthermore, possible pathways of 4-CP degradation in solution are proposed.

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Organic dye removal from aqueous solution by glidarc discharges

Cited by 104 publications

References 5 publications

Retraction: Plasma Acid: Water Treated by Dielectric Barrier Discharge

Retraction: Plasma Acid: Water Treated by Dielectric Barrier Discharge

Destruction plasmachimique d’urée et de thiourée par décharge électrique à pression atmosphérique

Degradation of 4-Chlorophenol using a Gas–Liquid Gliding Arc Discharge Plasma Reactor

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