Color changes accompanying one-electron reduction and oxidation of the azo dyes

Zielonka, Jacek; Czerwińska, Małgorzata; Sikora, Adam; Sokołowska, Jolanta; Marcinek, Andrzej

doi:10.1016/j.jphotochem.2004.01.006

Cited by 16 publications

(8 citation statements)

References 32 publications

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“…The color changes accompanying one-electron reduction and oxidation of the azo dyes have also been reported in the literature [81]. Under cryogenic conditions, the radical anion of the dye 4-N,N-diethylaminoazobenzene, have been spectroscopically characterized by the electronic absorption spectra and color changes of the solution.…”

Section: Pulse Radiolysis Of Dye Solutionsmentioning

confidence: 74%

Radiation induced degradation of dyes—An overview

Rauf

Ashraf

2009

Journal of Hazardous Materials

244

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Section: Pulse Radiolysis Of Dye Solutionsmentioning

confidence: 74%

Radiation induced degradation of dyes—An overview

Rauf

Ashraf

2009

Journal of Hazardous Materials

244

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“…Otherwise, a large amount of the supplied current will be wasted in producing O 2 , leading to a low CE. In this respect, several anode materials such as graphite and platinum which do not have a sufficient O 2 evolution over potential have been tested, but some of them presented a rapid loss of activity due to surface fouling and others showed a limited service life [22,23]. In fact, there are very few electrodes currently available that have high O 2 evolution over potential.…”

Section: Introductionmentioning

confidence: 99%

Indium tin oxide coated conducting glass electrode for electrochemical destruction of textile colorants

Bandara¹,

Wansapura²,

Jayathilaka³

2007

Electrochimica Acta

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“…2a). This mechanism seems to be a highly probable explanation of N,N-dialkylated aromatic amine photodegradation, since the reaction intermediates namely cation radicals and radicals were observed using spectroscopic methods (Görner and Döpp 2002;Zielonka et al 2004;Podsiadły et al 2007). On the other hand, when ODPABA degradation is carried out in the presence of NaOCl, the reaction probably proceeds via ionic mechanism.…”

Section: Resultsmentioning

confidence: 96%

Studies on the formation of formaldehyde during 2-ethylhexyl 4-(dimethylamino)benzoate demethylation in the presence of reactive oxygen and chlorine species

Studziński

Gackowska

Przybyłek

et al. 2017

Environ Sci Pollut Res

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In order to protect the skin from UV radiation, personal care products (PCPS) often contain chemical UV-filters. These compounds can enter the environment causing serious consequences on the water ecosystems. The aim of this study was to examine, the effect of different factors, such as UV light, the presence of NaOCl and H2O2 on the formaldehyde formation during popular UV filter, 2-ethylhexyl 4-(dimethylamino)benzoate (ODPABA) demethylation. The concentration of formaldehyde was determined by VIS spectrophotometry after derivatization. The reaction mixtures were qualitatively analyzed using GC/MS chromatography. The highest concentration of formaldehyde was observed in the case of ODPABA/H2O2/UV reaction mixture. In order to describe two types of demethylation mechanisms, namely, radical and ionic, the experimental results were enriched with Fukui function analysis and thermodynamic calculations. In the case of non-irradiated system containing ODPABA and NaOCl, demethylation reaction probably proceeds via ionic mechanism. As it was established, amino nitrogen atom in the ODPABA molecule is the most susceptible site for the HOCl electrophilic attack, which is the first step of ionic demethylation mechanism. In the case of irradiated mixtures, the reaction is probably radical in nature. The results of thermodynamic calculations showed that abstraction of the hydrogen from N(CH3)2 group is more probable than from 2-ethylhexyl moiety, which indicates higher susceptibility of N(CH3)2 to the oxidation.Electronic supplementary materialThe online version of this article (doi:10.1007/s11356-017-8477-8) contains supplementary material, which is available to authorized users.

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Color changes accompanying one-electron reduction and oxidation of the azo dyes

Cited by 16 publications

References 32 publications

Radiation induced degradation of dyes—An overview

Radiation induced degradation of dyes—An overview

Indium tin oxide coated conducting glass electrode for electrochemical destruction of textile colorants

Studies on the formation of formaldehyde during 2-ethylhexyl 4-(dimethylamino)benzoate demethylation in the presence of reactive oxygen and chlorine species

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