Assessment of degradation of eight commercial reactive azo dyes individually and in mixture in aqueous solution by ozonation

Sarayu, K.; Swaminathan, K.; Sandhya, S.

doi:10.1016/j.dyepig.2006.06.011

Cited by 52 publications

(19 citation statements)

References 31 publications

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“…Several authors have also reported pseudo first-order kinetics for reactions between different dyes and ozone. 7,8,13,14,22 The similar result was observed at 321 nm (not shown) which suggests the same kinetics behavior, but at lower ozonation rate (four times slower) for aromatic degradation. A summary of the kinetics data, pH and conductivity measurements, obtained during Acid Black 1 ozonation, is presented in Table 1.…”

Section: Ozonation Kineticssupporting

confidence: 68%

“…The inverse relation between the dye concentration and the ozonation rate was observed, in accordance with literature. 4,5,8,20 The decrease of pH was expected, due to the formation of inorganic and organic acids during ozonation, confirmed by a significant conductivity increase, more pronounced for high dye concentrations.…”

Section: Ozonation Kineticsmentioning

confidence: 99%

“…5 Despite the fact that ozonation in acid medium is not an AOP, O 3 proved to yield excellent results on dye effluents treatment. [6][7][8][9] Some studies have been reported about destruction of Acid Black 1 by ozonation. [10][11][12][13] However, none of these studies concerned the by-products formation during ozone attack.…”

Section: Introductionmentioning

confidence: 99%

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Ozonation of azo dye acid black 1 under the suppression effect by chloride ion

Paprocki¹,

Santos²,

Hammerschitt³

et al. 2010

J. Braz. Chem. Soc.

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O objetivo deste estudo é determinar a cinética degradação do corante Acid Black 1 por ação oxidante do ozônio e avaliar a influência da contaminação de íons cloreto na degradação deste corante. Foram observadas cinéticas de pseudo-primeira ordem, tanto para a degradação das estruturas cromóforas (620 nm), quanto das aromáticas (321 nm). A completa remoção da coloração foi verificada em 25 min ([corante] 0 = 1,8 × 10 -5 mol L -1 ), enquanto que as estruturas aromáticas foram degradadas com menor velocidade. A presença de íon cloreto, principal impureza do reagente sólido, influencia significantemente a velocidade de ozonização (-42%), mesmo em baixa concentração (5,6 × 10 -4 mol L -1 ). O mecanismo mais provável para o efeito supressor do íon cloreto envolve a direta reação entre O 3 e Cl -gerando HOCl, dentre outros subprodutos. Apesar deste aspecto, a ozonização pode ser um processo de degradação competitivo para este corante.The aim of this study is to determine the kinetics of the Acid Black 1 dye by oxidizing action of ozone and to evaluate the influence of chloride ion contamination on the dye degradation. Pseudofirst order kinetics was observed for both decolorization (620 nm) and aromatic structure (321 nm) degradations. A complete color removal was verified in 25 min ([dye] 0 = 1.8 × 10 -5 mol L -1 ), while aromatic structures degraded at slower rates. The presence of chloride ion, the principal impurity of the solid dye reagents, influences significantly the ozonation rate (-42%), even at low chloride concentration (5.6 × 10 -4 mol L -1 ). The most probable mechanism for the chloride suppression effect involves a direct reaction between O 3 and Cl -generating HOCl, among other by-products. In despite of that, ozonation could be a competitive degradation process for this dye.

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Section: Ozonation Kineticssupporting

confidence: 68%

Section: Ozonation Kineticsmentioning

confidence: 99%

See 1 more Smart Citation

Ozonation of azo dye acid black 1 under the suppression effect by chloride ion

Paprocki¹,

Santos²,

Hammerschitt³

et al. 2010

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

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“…In reality, effluents often contain multiple dyes and the study of the possible interactions between different chromophoric groups during the treatment may be useful (Sarayu et al, 2007). UV-Vis spectra of mixtures of dyes treated with GAD versus time were obtained for all mixtures.…”

Section: Study Of the Mixtures Discoloration By Gad Treatmentmentioning

confidence: 99%

Plasma treatment by gliding arc discharge of dyes/dye mixtures in the presence of inorganic salts

Merouani

Abdelmalek

Taleb

et al. 2015

Arabian Journal of Chemistry

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The gliding arc discharge plasma (GAD) technique was used for discoloration and degradation of an anthraquinone dye Alizarin red S (ARS), an azo dye Orange G (OG) and their mixture. The influence of chloride and sulfate salts on the efficiency of treatment has also been studied. The aim of this study is the discoloration and degradation by GAD of ARS, and OG and their mixture.The GAD plasma generated between two moist air metallic electrodes connected to a high voltage produced chemical species and highly reactive molecules Å OH, NO Å , O Å , O 2 , HO 2 Å , H Å , H 2 O 2 , O 3 . . . and other excited-state neutral molecules. The reactions of discoloration for ARS and OG followed pseudo-first-order kinetics. The apparent kinetic constants of bleaching were found equal to 0.014 and 0.013 min À1 and degradation of 0.008 and 0.010 min À1 , respectively for the ARS and OG. For mixtures, the rate of discoloration was 80% in 120 min of treatment for mixtures III, IV and V, while the rate of COD reduction was fast in the first 30 min since it varied between 35% and 40% for all mixtures but stabilized at 68% toward the end of the treatment. The addition of chloride salts and sulfate showed a decrease in the effectiveness of treatment.

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“…In the literature, for different pH values, ozone doses, and durations, COD and color removal ranges vary between 37 and 60% and between 87 and 99%, respectively [16][17][18][19][20][21]. In particular, the effective elimination of toxic substances in textile effluents was observed with ozonation [22,23].…”

Section: Introductionmentioning

confidence: 99%

Determination of Biological Treatability Processes of Textile Wastewater and Implementation of a Fuzzy Logic Model

Kabuk

Avşar

Kuzu

et al. 2015

International Journal of Photoenergy

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This study investigated the biological treatability of textile wastewater. For this purpose, a membrane bioreactor (MBR) was utilized for biological treatment after the ozonation process. Due to the refractory organic contents of textile wastewater that has a low biodegradability capacity, ozonation was implemented as an advanced oxidation process prior to the MBR system to increase the biodegradability of the wastewater. Textile wastewater, oxidized by ozonation, was fed to the MBR at different hydraulic retention times (HRT). During the process, color, chemical oxygen demand (COD), and biochemical oxygen demand (BOD) removal efficiencies were monitored for 24-hour, 12-hour, 6-hour, and 3-hour retention times. Under these conditions, 94% color, 65% COD, and 55% BOD removal efficiencies were obtained in the MBR system. The experimental outputs were modeled with multiple linear regressions (MLR) and fuzzy logic. MLR results suggested that color removal is more related to COD removal relative to BOD removal. A surface map of this issue was prepared with a fuzzy logic model. Furthermore, fuzzy logic was employed to the whole modeling of the biological system treatment. Determination coefficients for COD, BOD, and color removal efficiencies were 0.96, 0.97, and 0.92, respectively.

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Assessment of degradation of eight commercial reactive azo dyes individually and in mixture in aqueous solution by ozonation

Cited by 52 publications

References 31 publications

Ozonation of azo dye acid black 1 under the suppression effect by chloride ion

Ozonation of azo dye acid black 1 under the suppression effect by chloride ion

Plasma treatment by gliding arc discharge of dyes/dye mixtures in the presence of inorganic salts

Determination of Biological Treatability Processes of Textile Wastewater and Implementation of a Fuzzy Logic Model

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