Ozonation of the reactive dye intermediate 2-naphthylamine 3,6,8-trisulphonic acid (K-Acid) : kinetic assessment, ozonation products and ecotoxicity / Idil Arslan-Alaton in COLORATION TECHNOLOGY, Vol. 128, N° 5 (2012)  

[article]  inCOLORATION TECHNOLOGY > Vol. 128, N° 5 (2012) . - p. 387-394 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 [article]

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