[article]
Titre : |
Ozonation of the reactive dye intermediate 2-naphthylamine 3,6,8-trisulphonic acid (K-Acid) : kinetic assessment, ozonation products and ecotoxicity |
Type de document : |
texte imprimé |
Auteurs : |
Idil Arslan-Alaton, Auteur ; Gulcan Basar, Auteur ; Tugba Olmez, Auteur |
Année de publication : |
2012 |
Article en page(s) : |
p. 387-394 |
Note générale : |
Bibliogr. |
Langues : |
Anglais (eng) |
Catégories : |
Colorants -- Oxydation Colorants réactifs Ozonation
|
Index. décimale : |
667.3 Teinture et impression des tissus |
Résumé : |
Ozonation of the commercially important, recalcitrant reactive dye intermediate 2-naphthylamine 3,6,8-trisulphonic acid (K-Acid) was investigated. Ozonation performance was examined by following ozone absorption rates and K-Acid, chemical oxygen demand and total organic carbon removals. Mean oxidation states and unidentified organic products were also determined. At pH 3, where direct ozone reactions are dominant, the second-order rate constant between K-Acid and molecular ozone was determined as 20 m?1 s?1 for steady-state aqueous ozone concentration. The competition kinetics approach was also adopted where a reference compound, phenol, and K-Acid were subjected to ozonation. By applying this method, the second-order reaction rate constant was found to be 76 m?1 s?1. Common oxidation products formed during ozonation at pH 3, pH 7 and pH 7 with 1 mm hydrogen peroxide were identified as methoxy-phenyl-oxime, phenol, benzene, benzaldehyde and oxalic acid via high-performance liquid chromatography and gas chromatography/mass spectrometry analyses. Continuous nitrate and sulphate evolution were observed during K-Acid ozonation as a consequence of the abrupt release and subsequent oxidation of its amino and sulphonate groups. The number and amount of reaction products were most intensive for K-Acid ozonation at pH 7 with 1 mm hydrogen peroxide. According to the acute toxicity tests conducted with Vibrio fischeri, ozonation products were not less toxic than the original K-Acid solution that caused only 15% inhibition. |
Note de contenu : |
- EXPERIMENTAL : Materials - Ozonation experiments - Oxidation products identification - Other analytical procedures - Acute toxicity
- RESULTS AND DISCUSSION : Baseline experiments - Kinetic assessment - Ozonation products and acute toxicity assessment - Changes i acute toxicity |
DOI : |
10.1111/j.1478-4408.2012.00392.x |
En ligne : |
http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2012.00392.x/pdf |
Format de la ressource électronique : |
Pdf |
Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15807 |
in COLORATION TECHNOLOGY > Vol. 128, N° 5 (2012) . - p. 387-394
[article]
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