Some Aspects of the Light Fastness of Reactive Azo‐dyes on Cellulose under Wet Conditions

Datyner, A.; Nicholls, C. H.; Pailthorpe, M.T.

doi:10.1111/j.1478-4408.1977.tb03349.x

Cited by 21 publications

(2 citation statements)

References 12 publications

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“…All fragments are hydroxylated derivatives of dye 1, and their chemical structures are detected and are shown in Table 2. As proposed by Datyner et al., 29 in the aqueous environment, photofading of azo dyes is induced by hydroxyl radicals. The hydroxyl radical, as a kind of electrophile, has been detected in dye solution, and would attack the dye molecules selectively.…”

Section: Resultsmentioning

confidence: 88%

Study of degradation products and degradation pathways of sulfonated azo dyes under ultraviolet irradiation

Wang

et al. 2017

Textile Research Journal

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Monitoring the light-induced decomposition course of azo dyes is essential to understand their degradation pathways and mechanisms. In this study, two model dyes are synthesized and used for stimulating the photodegradation processes of azo and hydrazone dyes, respectively. Their intermediates formed during initial and final fading processes are characterized by high-performance liquid chromatography-electrospray ionization-mass spectrometry, gas chromatography-mass spectrometry and ion chromatography. Results reveal that no dramatic differences are observed between the two dyes, although hydrazone dye would undergo a more complicated degradation process. Hydroxyl radicals are the dominant reactive species involved in the photodegradation of both model dyes under ultraviolet irradiation. In the initial steps, the intermediates are almost hydroxylated derivatives, while low-molecular-weight dicarboxylic acids and their hydroxylated and esterified derivatives, as well as non-volatile inorganic ions, are detected and evidenced in the final steps. Furthermore, photodegradation pathways and mechanisms for the two model dyes are proposed accordingly.

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Section: Resultsmentioning

confidence: 88%

Study of degradation products and degradation pathways of sulfonated azo dyes under ultraviolet irradiation

Wang

et al. 2017

Textile Research Journal

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“…In the aqueous environment, photoejection of electrons and hydroxyl radical (OH) induced reaction were the main mechanisms for the photofading of reactive azodyes, as proposed by Datyner et al 19 In order to confirm the mechanism of NaCl concentrations on the photodecoloration of dyes, spin trapping agent DMPO was used to react with radicals that may be present in the RB5 solutions with 0, 1 and 300 g/L NaCl, respectively. As shown in Figure 3(a), the EPR signal of the DMPO-OH adduct is detected in the RB5 solution without the addition of NaCl using the EPR spectrometer.…”

Section: Proposed Mechanism Of Dye Photodecoloration In the Presence Of Naclmentioning

confidence: 99%

Effect of NaCl concentrations on the photodecoloration of reactive azo-dyes and their cotton dyeings

Chen

Dong

et al. 2014

Textile Research Journal

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The color fastness of reactive cotton dyeings under simultaneous exposure to light and saline water, as well as light and perspiration, is one of the most important characteristics especially for summer-time sportswear. In order to illustrate the dual effects (i.e. favorable or adverse) of saline water on the photofading of reactive azo-dyes, the degradation mechanism and reaction kinetics of dye photodecoloration in the presence of various NaCl concentrations were investigated in simulated experiments. Experimental results indicated that the photodecoloration of dye solution was mainly attributed to the hydroxyl radical. Due to the quenching of the hydroxyl radical by the chloride ion, the dye photodecoloration rate decreased with low NaCl concentration (<10 g/L). Nevertheless, higher NaCl concentration (>50 g/L) was beneficial to produce reactive chlorine species, resulting in a significant increase of the photodecoloration rate. Moreover, reaction kinetic analysis demonstrated that the observed first-order rate constant for the photodecoloration of dye solution consistently increased with the increasing NaCl concentration.

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Factors influencing the photofading of commercial anthraquinone dyes in solution

Allen¹,

Fatinikun²,

Davies³

et al. 1981

Dyes and Pigments

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Some Aspects of the Light Fastness of Reactive Azo‐dyes on Cellulose under Wet Conditions

Cited by 21 publications

References 12 publications

Study of degradation products and degradation pathways of sulfonated azo dyes under ultraviolet irradiation

Study of degradation products and degradation pathways of sulfonated azo dyes under ultraviolet irradiation

Effect of NaCl concentrations on the photodecoloration of reactive azo-dyes and their cotton dyeings

Factors influencing the photofading of commercial anthraquinone dyes in solution

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