Gliding arc plasma assisted photocatalytic degradation of anthraquinonic acid green 25 in solution with TiO2

Ghezzar, Mouffok Rédouane; Abdelmalek, Fatiha; Belhadj, Mohamed; Benderdouche, N.; Addou, A.

doi:10.1016/j.apcatb.2006.11.008

Cited by 91 publications

(61 citation statements)

References 33 publications

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“…Hence, the combination of electrical discharge plasma with TiO 2 photocatalysis can be an effective approach to increase the decomposition rates of the plasma induced degradation process by utilizing of ultraviolet radiation from the discharge. Ghezzar et al [21] and Marouf-Khelifa et al [22] similarly have proved the enhancement of contaminants degradation in GAD plasma process in combination with TiO 2 .…”

Section: Introductionmentioning

confidence: 90%

“…The degradation of AO7 starts with the breaking of azo bond, the most active and chromospheres group in the structure, to form intermediate product [40]. So decolorization is the initial manifestation of AO7 degradation process and the kinetics of decolorization of AO7 could be represented by the variation of AO7 concentration based on the disappearance of visible band located at 484 nm [21]. Results of regression analysis for the pseudo-first order kinetics were displayed in Table 1.…”

Section: Study Of Decolourizationmentioning

confidence: 99%

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Degradation of Acid Orange 7 by Gliding Arc Discharge Plasma in Combination with Advanced Fenton Catalysis

Zhang

Wang

et al. 2010

Plasma Chem Plasma Process

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A new plasma-catalysis process of gliding arc discharge (GAD) plasma with zero-valent iron (ZVI) was examined. Because GAD plasma creates an acidic environment, solid iron releases ferrous ions which act as a catalyst for the decomposition of the hydrogen peroxide. A comparative study of the catalytic effects between Fe 2? and Fe 0 in GAD plasma was investigated. The decolorization reactions of Acid Orange 7 (AO7) followed pseudo-first-order kinetics. And the rate constants for the process of GAD with ZVI was increased by 30% and by 19%, respectively, compared with the process of GAD alone and the process of GAD with ferrous. The investigations of solution pH and hydrogen peroxide both demonstrated that the GAD plasma induced conditions are much suitable for advanced Fenton reactions. The corrosion of ZVI in GAD plasma can give continuous ferrous ions to sustain Fenton reaction. Also, ZVI was demonstrated to have favorable reusable feature.

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Section: Introductionmentioning

confidence: 90%

Section: Study Of Decolourizationmentioning

confidence: 99%

Degradation of Acid Orange 7 by Gliding Arc Discharge Plasma in Combination with Advanced Fenton Catalysis

Zhang

Wang

et al. 2010

Plasma Chem Plasma Process

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“…La constante apparente de la cinétique de disparition du NET obtenue est de 0,0178 min -1 . Cette constante est similaire à diverses autres constantes obtenues dans les études portant sur la dégradation des colorants azoïques par plasma où elles varient de 0,008 min -1 à 0,033 min -1 (ABDELMALEK et al, 2004;GHEZZAR et al, 2007).…”

Section: Mesures Spectrophotométriquesunclassified

Élimination du Noir Eriochrome T par plasma glidarc

Djepang

Laminsi

Iya-Sou

et al. 2014

rseau

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Résumé L’élimination d’une solution aqueuse de Noir Eriochrome T (NET), composé organique largement utilisé en industrie textile, a été effectuée par plasma glidarc. Ce procédé d’oxydation avancée (POA) met en jeu les espèces gazeuses actives créées dans la décharge, principalement les radicaux OH°, son dimère H2O2 et le peroxynitrite ONOO- (dérivé de l’oxyde nitrique). Ces espèces induisent des propriétés fortement oxydantes qui sont largement employées pour la destruction de déchets organiques. Outre les espèces oxydantes, certains composés issus du radical NO°(HONO et ONOOH) et présents en solution confèrent également au plasma des propriétés acidifiantes qui accélèrent ainsi les réactions d’oxydation. L’étude spectrophotométrique d’une solution de NET (15 µM) exposée à la décharge électrique a permis de révéler qu’aux premiers instants du traitement (t < 3 min), il se forme un composé intermédiaire qui absorbe à λ = 752 nm; la cinétique de décoloration observée présente une loi de variation d’ordre global égal à un avec une constante de vitesse k = 2,11 min‑1. Après 45 min de traitement, un taux de décoloration de 85,1 % est obtenu. Au bout du même temps, le composé présent initialement en solution à 15 µM se minéralise à 57,3 % avec une constante de vitesse k1 = 0,0188 min‑1. L’obtention d’un abattement de 67 % de la demande chimique en oxygène (DCO) avec une constante de vitesse k2 = 0,0253 min‑1 permet de confirmer que le composé se dégrade bien sous l’effet de la décharge. Par ailleurs, bien que la cinétique de disparition d’une solution plus concentrée (150 µM) soit plus lente (k3 = 0,0178 min‑1), le composé se décolore à 82,0 % et un taux de dégradation de 86,6 % est obtenu après une durée d’exposition de 50 min. Les analyses qualitatives effectuées juste après arrêt de la décharge ont également révélé la présence en solution des ions minéraux issus de la dégradation de la molécule.

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“…A magnetic stirrer was used continuously to guarantee the good mixing of the solution. Irradiation experiments were performed using a 6W medium pressure In agreement with previous literatures [18,19], the degradation of DVO-4 dye fitted with pseudo-first order kinetics [ln(C/C0) =−kt] (where C0 and C are the initial dye concentration and at time t, respectively, and (k, min −1 ), is the reaction rate constant). The rate constant, k, was calculated from the slopes of the straight-line portion of the plots [ln(C/C0) vs. time].…”

Section: Catalytic Activity Testsmentioning

confidence: 99%

Degradation of Azo Dye C. I. Direct Violet- 4 by Vanadium Modified Mfi Zeoltie Powder Adsorption and Photooxidation in Aqueous Solution

Thabet

2011

Al-Azhar Bulletin of Science

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Vanadium modified zeolite was synthesized using the chemical liquid deposition (CLD) and wet exchange methods refer by V/ZCLD, V/Zwet . The obtained materials were calcined at 550°C and characterized using XRD, FTIR, and nitrogen adsorption. The characterized materials were applied for the photo-decolorization of direct violet-4 (DVO-4) as a member of azo dye family, in aqueous medium using hydrogen peroxide and/or UV irradiation (254 nm). The effects of time and catalyst concentration on the decolorization of DVO-4 dye were investigated. The decolorization of (DVO-4) dye and the decreasing in concentration of the dye have been followed using UV-vis spectrophotometry. Results showed that the addition of V/ZCLD, V/Zwet and H2O2 to the dye solution enhanced the rate of degradation. The decolorization followed the pseudo first order kinetics model and a significant mineralization of (DVO-4) was observed.

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Gliding arc plasma assisted photocatalytic degradation of anthraquinonic acid green 25 in solution with TiO2

Cited by 91 publications

References 33 publications

Degradation of Acid Orange 7 by Gliding Arc Discharge Plasma in Combination with Advanced Fenton Catalysis

Degradation of Acid Orange 7 by Gliding Arc Discharge Plasma in Combination with Advanced Fenton Catalysis

Élimination du Noir Eriochrome T par plasma glidarc

Degradation of Azo Dye C. I. Direct Violet- 4 by Vanadium Modified Mfi Zeoltie Powder Adsorption and Photooxidation in Aqueous Solution

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