Combined kinetic and spectroscopic study of oxidation of azo dyes in surfactant solutions by hypochlorite

Oakes, John; Gratton, Peter; Gordon-Smith, Toby

doi:10.1016/s0143-7208(00)00051-6

Cited by 38 publications

(31 citation statements)

References 6 publications

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“…It is also clear that DTAC enhances the reactivity of hypochlorite. This is in line with conclusions from homogeneous studies of dye oxidation [9] and the enhancement is likewise attributed partly to effects of detergency, i.e. enhanced wetting/stain removal.…”

Section: Resultssupporting

confidence: 90%

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Kinetic and spectroscopic study of heterogeneous oxidation of azo dyes using hypochlorite

Oakes

Gratton

Wilkes

et al. 2001

Coloration Technology

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A combined kinetic and spectroscopic investigation is described of the heterogeneous oxidation (by hypochlorite) of an azo dye (Remazol Red RB) reactively bound to cotton. It is shown that the physical state of bound dye (e.g. its pKA and tautomeric form) and its oxidation profile with pH are similar to those of dye in homogeneous solution. Analyses are presented which suggest that the mechanism of oxidation in the two environments is similar. The oxidation of azo dyes of pyrazolone and pyridone types occurs at similar rates to arylazonaphthol dyes. This suggests that oxidation kinetics are independent of groups attached either side of the azo linkage, confirming that the site of attack is the more nucleophilic nitrogen atom of the azo group of the common anion.

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Section: Resultssupporting

confidence: 90%

“…The percentage change in reflectance at 540 nm (DR 540 ) was calculated by subtracting the reflectance at 540 nm after washing from that from a control wash at pH 8 with no bleach. Experimental details for homogeneous oxidation have been given previously [9].…”

Section: Dye Bleachingmentioning

confidence: 99%

Kinetic and spectroscopic study of heterogeneous oxidation of azo dyes using hypochlorite

Oakes

Gratton

Wilkes

et al. 2001

Coloration Technology

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“…10 ÿ5 M dye solutions obtained at different pH values were used in the determination of pK a values of the dye at 298.15 K according to the procedure found elsewhere [12].…”

Section: Methodsmentioning

confidence: 99%

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

2006

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“…Details of spectroscopic experiments, including pK A determinations, and solution preparations have been given previously [1,2,5]. The relative affinity of the dye for cotton and the colour yield (K/S) of the dye bound to cotton (with or without surfactant) were carried out as described previously for systems with or without polymers [3].…”

Section: Methodsmentioning

confidence: 99%

Solubilisation of dyes by surfactant micelles. Part 3; A spectroscopic study of azo dyes in surfactant solutions†

Oakes

Gratton

Dixon

2003

Coloration Technology

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A spectroscopic study (UV–vis and adsorption) has been made of the interactions of select model azo dyes with a range of surfactant types or their mixtures both above and below their respective critical micelle concentrations. All surfactants inhibit adsorption of the dyes to cotton above their critical micelle concentrations due to incorporation in micelles. However, formation of 1;1 complexes between dyes and cationic or zwitterionic surfactants in sub‐micellar regions results in enhanced deposition on cotton. It is shown that attractive or repulsive electrostatic interactions play a key role in dye binding to micelles. Unusually, spectra of complexes formed between the dye and cationic surfactant are typical of those of the azo tautomeric form as opposed to the hydrazone form that is prevalent in aqueous media. Addition of anionic surfactant to micellar solutions of nonionic or zwitterionic surfactants results in successive displacement of dye from the respective micelles, i.e. binding is competitive.

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Combined kinetic and spectroscopic study of oxidation of azo dyes in surfactant solutions by hypochlorite

Cited by 38 publications

References 6 publications

Kinetic and spectroscopic study of heterogeneous oxidation of azo dyes using hypochlorite

Kinetic and spectroscopic study of heterogeneous oxidation of azo dyes using hypochlorite

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

Solubilisation of dyes by surfactant micelles. Part 3; A spectroscopic study of azo dyes in surfactant solutions†

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