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Oxidative decolorisation of Eriochrome Black T with Chloramine-T : kinetic, mechanistic, and spectrophotometric approaches / Adalegere S. Manjunatha in COLORATION TECHNOLOGY, Vol. 130, N° 5 (10/2014)
[article]
Titre : Oxidative decolorisation of Eriochrome Black T with Chloramine-T : kinetic, mechanistic, and spectrophotometric approaches Type de document : texte imprimé Auteurs : Adalegere S. Manjunatha, Auteur ; Anu Sukhdev, Auteur ; Puttaswamy, Auteur Année de publication : 2014 Article en page(s) : p. 340-348 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants -- Oxydation
Décoloration
Eaux usées -- RecyclageTags : 'Milieu acide' alcalin' 'Chloramine-T' 'Eriochrome Black T' 'Sodium N-chloro-p-toluenesulfonamide' Index. décimale : 667.3 Teinture et impression des tissus Résumé : The kinetics and mechanism of oxidative decolorisation of Eriochrome Black T (EBT) with sodium N-chloro-p-toluenesulfonamide or Chloramine-T (CAT), catalysed by osmium tetroxide [Os(VIII)] in alkaline medium and uncatalysed in acid medium, have been spectrophotometrically investigated at 303 K. The reaction exhibited a first-order dependence of rate on [CAT]0 and [EBT]0 in both media, and also with respect to [H+]. The order with respect to [OH-] and [Os(VIII)] was fractional. Activation parameters were deduced. It was observed that the uncatalysed decolorisation reaction was ca. eightfold faster in acid medium in comparison with alkaline medium, while the Os(VIII)-catalysed reaction was ca. sevenfold faster than the uncatalysed reaction. Mechanisms and rate laws were determined. The chemical oxygen demand of Eriochrome Black T dye was also determined. Importantly, the developed oxidative decolorisation method is simple, efficient, inexpensive, requires less time, and is environmentally benign. Hence, it can be adapted for treating Eriochrome Black T present in industrial and laboratory wastewater. Note de contenu : - EXPERIMENTAL : 1. Materials and methods - 2. Stoichiometry and characterisation of products
- RESULTS AND DISCUSSION : 1. Reactive species of Chloramine-T - 2. Tautomerism of Eriochrome Black T - 3. Reaction scheme and rate law in acid medium - 4. Reaction scheme and rate law in alkaline mediumDOI : 10.1111/cote.12104 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12104 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22072
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