| 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 -- Recyclage
|
| Tags : |
'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 medium |
| DOI : |
10.1111/cote.12104 |
| En ligne : |
https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12104 |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22072 |
in COLORATION TECHNOLOGY > Vol. 130, N° 5 (10/2014) . - p. 340-348
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