Kinetics and mechanism of azo dye destruction in advanced oxidation processes

Wojnárovits, László; Pálfi, T.; Takács, Erzsébet

doi:10.1016/j.radphyschem.2007.02.060

Cited by 28 publications

(11 citation statements)

References 17 publications

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“…The absorption band recorded during radiation-induced discolouration of RR2 (Fig. 8) at wavelength range above 570 nm can be assigned to dye molecule containing an extra OH group in the conjugated part of the molecule as it was suggested by Wojnarovits et al [35]. The visible bands of both dyes can be decreased to the minimum value for doses in the range 15-16 kGy (inset in Fig.…”

Section: Radiolysissupporting

confidence: 57%

“…Experiments of pulse radiolysis were carried out in order to determine intermediate products of the reaction with The hydroxyl radical can react with RR2 and RB81 by hydrogen abstraction or by addition to various parts of the dye molecule with diffusion-limited rate coefficients. The most probable position of the • OH addition is an aromatic ring in several positions (ortho-, meta-, para-) or the azo group in the dye molecule [35]. Therefore, the observed spectra are composite ones.…”

Section: Radiolysismentioning

confidence: 99%

“…7) result from the • OH addition to the aromatic ring in the dye molecule. This is due to the fact that cyclohexadienyl and naphthoxyl-type radicals show typical absorbance bands in the wavelengths between 300 and 400 nm [35,38].…”

Section: Radiolysismentioning

confidence: 99%

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Electrochemical discolouration and degradation of reactive dichlorotriazine dyes: reaction pathways

et al. 2010

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Results of electrochemical oxidation of two reactive dichlorotriazine dyes: Reactive Red 2 and Reactive Blue 81, are presented in this paper. Two electrode materials: Ti/TiO 2 (70%)-RuO 2 (30%) and carbon felt, were applied in the investigations as anodes. Voltammetric measurements show that Reactive Blue 81 electrooxidation proceeds easier and with higher rate than electrooxidation of Reactive Red 2. Both dyes are oxidised irreversibly in at least one electrode step before oxygen evolution starts at the electrode. Effectiveness of electrochemical oxidation under potentiostatic conditions achieved for Reactive Blue 81 was higher than for Reactive Red 2, with application of a carbon felt anode. Pulse radiolysis measurements prove addition of • OH radical to the dye molecule and formation of cyclohexadienyl and naphthoxyl radicals. Results of voltammetric analysis, pulse radiolysis measurements and GC-MS identification of intermediate products suggest two possible pathways of the dyes electrochemical oxidation.

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Section: Radiolysissupporting

confidence: 57%

Section: Radiolysismentioning

confidence: 99%

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Electrochemical discolouration and degradation of reactive dichlorotriazine dyes: reaction pathways

et al. 2010

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“…Removal efficiencies of pollutants during gamma radiation are in dependence on the kind of active species [23]. The predominant species from water radiolysis vary with solution pH.…”

Section: Effect Of Ph On Removal Of Four Halomethanesmentioning

confidence: 99%

Radiation removals of low-concentration halomethanes in drinking water

Guo

Zhang

et al. 2009

Journal of Hazardous Materials

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“…These processes need to be environmentally safe, providing the elimination of contaminants and not just promoting a phase transfer, ensuring the reuse of water (Hermann & Guillard, 2002;Machado et al, 2003a;Sattler et al,, 2004;Wojnárovits et al, 2007).…”

Section: Introductionmentioning

confidence: 99%