Kinetic investigation of an azo dye oxidation by hydrogen peroxide in aqueous surfactant solution

Menek, Necati; Eren, Erdal; Topçu, Saim

doi:10.1016/j.dyepig.2005.01.010

Cited by 22 publications

(13 citation statements)

References 14 publications

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“…10 TAR and MTAR can be considered as triprotic acids. Deprotonated forms of these ADRs are stable in alkaline media (pK 1 (TAR) = 9.3, 56, 62 pK 1 (MTAR) = 11.8 57 ). Monoprotonated forms of TAR and MTAR predominate in neutral and weakly acidic solutions (pK 2 (TAR) = 6.0; 56,62 pK 2 (MTAR) = 5.6 57 ); the proton is bound to the oxygen atom in ortho-position to the azo group.…”

Section: Chemical Equations and Extraction Characteristicsmentioning

confidence: 99%

Extraction-Chromogenic Systems for Vanadium(V) Based on Azo Dyes and Xylometazoline Hydrochloride

Hristov¹,

Milcheva²,

Gavazov³

2019

ACSi

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Liquid-liquid extraction-chromogenic systems for vanadium(V) based on xylometazoline hydrochloride (XMZ) and azo derivatives of resorcinol (ADRs) were studied. The following ADRs were used: 4-(2-thiazolylazo)resorcinol (TAR), 5-methyl-4-(2-thiazolylazo)resorcinol (MTAR), and 6-hexyl-4-(2-thiazolylazo)resorcinol (HTAR). Concentration of the reagents, pH of the aqueous medium and shaking time were subjects of optimization experiments. The chloroform-extracted ternary complexes were of composition 1:1:1. The molar absorptivity coefficients (ε λ), absorption maxima (λ), constants of extraction (Log K), and fractions extracted (E%) were found to be ε 553 = 2.50 × 10 4 dm 3 mol-1 cm-1 , Log K = 3.5, and E = 96% (ADR = TAR); ε 550 = 1.88 × 10 4 dm 3 mol-1 cm-1 , Log K = 3.4, and E = 98% (ADR = MTAR); and ε 554 = 2.62 × 10 4 dm 3 mol-1 cm-1 , Log K = 5.0, and E = 99.5% (ADR = HTAR). The Sandell's sensitivities and Beer's law limits were determined as well.

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Section: Chemical Equations and Extraction Characteristicsmentioning

confidence: 99%

Extraction-Chromogenic Systems for Vanadium(V) Based on Azo Dyes and Xylometazoline Hydrochloride

Hristov¹,

Milcheva²,

Gavazov³

2019

ACSi

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“…They are used in various fields such as paper printing, electronic photography, color formers, dyeing, bleaching, polymers, liquid crystal displays, laser technology, data storage and solar energy conversion [1][2][3][4][5][6][7][8][9][10]. Recently, there is a rapidly growing interest in the potential of their biological-medical applications.…”

Section: Introductionmentioning

confidence: 99%

The triazine-based azo-azomethine dyes; synthesis, characterization, spectroscopy, solvatochromism and biological properties of 2,2′-(((6-methoxy-1,3,5-triazine-2,4-diyl)bis(sulfanediyl)bis(2,1-phenylene))bis(azanylylidene)bis(methanylylidene))bis(4-(phenyldiazenyl)phenol)

Ghasemian

Kakanejadifard

Azarbani

et al. 2015

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…4.9 can be attributed to incomplete complex formation due to the prevalence of protonated TAO species in the solution. 31 The decrease in absorbance at pH-values higher than ca. 5.2 can be explained by the formation of non-extractable negatively charged vanadium-containing species of the type [V(O) x (TAO) y ] n− (where n > 1 and vanadium oxidation state is +5).…”

Section: Lle-spectrophotometric Optimizationmentioning

confidence: 99%

Liquid-Liquid Extraction-Chromogenic System for Vanadium(V) Based on 4-(2-thiazolylazo)orcinol (TAO) and Aliquat 336

Toncheva

Milcheva

Gavazov

2018

ACSi

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The quaternary ammonium salt Aliquat 336 (A336; R 4 N + Cl −) and the azo dye 4-(2-thiazolylazo)orcinol (ТАО) were examined as constituents of a water-isobutanol extraction-chromogenic system for vanadium(V). Under the optimum conditions (c TAO = 1.6×10-3 mol dm-3 , c A336 = 1.3×10-2 mol dm-3 and pH 5.0), vanadium(V) is extracted as a ternary complex which can be represented by the formula (R 4 N +)[VO 2 (TAO 2−)]. The key extraction-spectrophotometric characteristics were determined. The interfering effect of foreign ions was studied as well. The wavelength of maximum absorption (λ max), molar absorptivity (ε max), constant of extraction (K ex) and fraction extracted (E) were found to be λ = 547 nm, ε = 3.1 × 10 4 dm 3 mol-1 cm-1 , Log K ex = 2.8 and E = 90.2%, respectively. Beer's law was obeyed in the range of 0.084-2.0 µg cm-3 and the limit of detection was 25 ng cm-3 of vanadium(V).

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Kinetic investigation of an azo dye oxidation by hydrogen peroxide in aqueous surfactant solution

Cited by 22 publications

References 14 publications

Extraction-Chromogenic Systems for Vanadium(V) Based on Azo Dyes and Xylometazoline Hydrochloride

Extraction-Chromogenic Systems for Vanadium(V) Based on Azo Dyes and Xylometazoline Hydrochloride

The triazine-based azo-azomethine dyes; synthesis, characterization, spectroscopy, solvatochromism and biological properties of 2,2′-(((6-methoxy-1,3,5-triazine-2,4-diyl)bis(sulfanediyl)bis(2,1-phenylene))bis(azanylylidene)bis(methanylylidene))bis(4-(phenyldiazenyl)phenol)

Liquid-Liquid Extraction-Chromogenic System for Vanadium(V) Based on 4-(2-thiazolylazo)orcinol (TAO) and Aliquat 336

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