Reduction of nitrite by sulfamic acid and sodium azide from aqueous solutions treated by gliding arc discharge

Marouf-Khelifa, Kheira; Abdelmalek, Fatiha; Khelifa, Amine; Belhadj, Mohamed; Addou, A.; Brisset, Jean‐Louis

doi:10.1016/j.seppur.2005.12.012

Cited by 41 publications

(31 citation statements)

References 20 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: 93%

“…[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: 93%

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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“…The order of magnitude of the parameters for the kinetic constant were in the range of k = 2.62-5.52 m 3 kmol -1 s -1 , higher than those found by Mahfud et al [2] and Marouf-Khelifa et al [7], 0.24 and 0.29 m 3 kmol -1 s -1 , respectively.…”

Section: Effects Of Operational Conditionscontrasting

confidence: 57%

Biphasic kinetic evaluation of the wet treatment of nitrogenated effluents

Queiroz

Knoechelmann

Medeiros

et al. 2010

Reac Kinet Mech Cat

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In this work, in addition to the nitrous acid formed by reactive uptake of nitrogen dioxide (NO 2 ) in water, it is proposed to reduce the nitrous ions levels by amino sulfonic acid (HSO 3 NH 2 ) in a mechanically agitated reactor. To this end, the following parameters were considered: agitation speed, pH, temperature, initial concentration of the reagents and their stoichiometric ratios. It was observed that the nitrous acid conversion (98.54%) was enhanced in acidic medium (pH \ 2.5), obeying a first-order reaction in relation to both reagents. A heterogeneous model for nitrogen production was proposed and the kinetics for the gas-liquid process was formulated, where the kinetic rate constants were in the range of 2.62-5.52 m 3 kmol -1 s -1 and the gas-liquid mass transfer coefficients were in the range of 0.00502-0.00825 s -1 .

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“…Effective inactivation was achieved in non-buffered purified water, as a result of the reduction of water pH of 7 to a pH of 3 (Chen et al, 2008). It was suggested that plasma acidification may involve the formation of nitrous acid (HNO2) and nitric acid (HNO3) from NO via NO2 (Marouf-Khelifa et al, 2006;Doubla et al, 2008). Bacteria inactivation using gaseous NO in a liquid phase was demonstrated by Ghaffari et al (2006).…”

Section: Role Of Plasma Species and Functional Moleculesmentioning

confidence: 99%