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Degradation of reactive red 194 and reactive yellow 145 azo dyes by O3 and H2O2/UV-C processes / Sermin Gül in Chemical engineering journal, Vol. 155 N° 3 (Decembre 2009) 

Public ISBD [article]  in Chemical engineering journal > Vol. 155 N° 3 (Decembre 2009) . - pp. 684-690 Titre : Degradation of reactive red 194 and reactive yellow 145 azo dyes by O3 and H2O2/UV-C processes Type de document : texte imprimé Auteurs : Sermin Gül, Auteur ; Ozlem Ozcan-Yildirim, Auteur Année de publication : 2010 Article en page(s) : pp. 684-690 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Ozonation  Hydrogen  peroxide/UV-C  Reactive  Red  194  Reactive  Yellow  145  Decolorization  Dearomatization Index. décimale : 660 Résumé : Reactive Red 194 (RR194), Reactive Yellow 145 (RY145) azo dyes and synthetic textile dye-bath effluent were treated with O3 and H2O2/UV-C processes. The operating parameters such as dye concentration, hydrogen peroxide concentration and pH values were evaluated to find the optimum conditions for the H2O2/UV-C processes. It was observed that while H2O2/UV-C process was more pH dependent in decolorization and dearomatization reactions, ozonation was less selective and more effective in both decolorization and dearomatization reactions. Results indicated that the decolorization and dearomatization rate of each dye are well defined by pseudo-first order reaction kinetics. In general, decolorization reactions were faster than dearomatization reactions in both systems, though ozonation had faster reaction rates in both decolorization and dearomatization compared to the corresponding reaction rates taking place during the application of the H2O2/UV-C process. According to decolorization efficiency it can be inferred that effect of OH radical scavengers (e.g. CO32−, Cl−) present in the synthetic dye-bath as well as radical formation promoter (e.g. OH−) was probably hidden due to complexity of the synthetic dye-bath matrix. DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4X4RWW8-3&_user=6 [...] [article] Degradation of reactive red 194 and reactive yellow 145 azo dyes by O3 and H2O2/UV-C processes [texte imprimé] / Sermin Gül, Auteur ; Ozlem Ozcan-Yildirim, Auteur . - 2010 . - pp. 684-690. Génie Chimique Langues : Anglais (eng) in Chemical engineering journal > Vol. 155 N° 3 (Decembre 2009) . - pp. 684-690 Mots-clés : Ozonation  Hydrogen  peroxide/UV-C  Reactive  Red  194  Reactive  Yellow  145  Decolorization  Dearomatization Index. décimale : 660 Résumé : Reactive Red 194 (RR194), Reactive Yellow 145 (RY145) azo dyes and synthetic textile dye-bath effluent were treated with O3 and H2O2/UV-C processes. The operating parameters such as dye concentration, hydrogen peroxide concentration and pH values were evaluated to find the optimum conditions for the H2O2/UV-C processes. It was observed that while H2O2/UV-C process was more pH dependent in decolorization and dearomatization reactions, ozonation was less selective and more effective in both decolorization and dearomatization reactions. Results indicated that the decolorization and dearomatization rate of each dye are well defined by pseudo-first order reaction kinetics. In general, decolorization reactions were faster than dearomatization reactions in both systems, though ozonation had faster reaction rates in both decolorization and dearomatization compared to the corresponding reaction rates taking place during the application of the H2O2/UV-C process. According to decolorization efficiency it can be inferred that effect of OH radical scavengers (e.g. CO32−, Cl−) present in the synthetic dye-bath as well as radical formation promoter (e.g. OH−) was probably hidden due to complexity of the synthetic dye-bath matrix. DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4X4RWW8-3&_user=6 [...]