A comparative study of ozonation on aqueous reactive dyes and reactive-dyed cotton / Mengru Li in COLORATION TECHNOLOGY, Vol. 137, N° 4 (12/07/2021)  

[article]  inCOLORATION TECHNOLOGY > Vol. 137, N° 4 (12/07/2021) . - p. 376-388 Titre : A comparative study of ozonation on aqueous reactive dyes and reactive-dyed cotton Type de document : texte imprimé Auteurs : Mengru Li, Auteur ; Zhenglei He, Auteur ; Jie Xu, Auteur Année de publication : 2021 Article en page(s) : p. 376-388 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants réactifs Coton Le coton est une fibre végétale qui entoure les graines des cotonniers "véritables"(Gossypium sp.), un arbuste de la famille des Malvacées. Cette fibre est généralement transformée en fil qui est tissé pour fabriquer des tissus. Le coton est la plus importante des fibres naturelles produites dans le monde. Depuis le XIXe siècle, il constitue, grâce aux progrès de l'industrialisation et de l'agronomie, la première fibre textile du monde (près de la moitié de la consommation mondiale de fibres textiles). Ozonation Teinture -- Fibres textiles Index. décimale : 667.3 Teinture et impression des tissus Résumé : Ozonation is increasingly being used and reported in recent years. This paper investigates ozonation on aqueous reactive dyes and their dyed cotton comparatively. The effects, including pH, temperature and initial dye concentration (for aqueous dyes)/water pick-up (for dyed cotton), on Reactive Blue FL-RN, Reactive Red FL-2BL and Reactive Yellow FL-2RN, were studied via Fourier Transform–infrared spectroscopy, ultraviolet-visible absorption and k/s curves. The kinetic results indicated that all the aqueous dyes were of pseudo-first order kinetics, while dyed cotton represented pseudo-secondary or pseudo-third order kinetics. Based on their different mechanisms, there was a dramatic gap between dyes and dyed cotton in ozonation performance. The curve of rate constant vs pH of dye ozonation exhibited a U-shape with the minimum value at pH 7, but for dyed cotton ozonation, the curve showed a Λ-shape optimised at pH 10. Also, high temperature resulted in hydrolysis of dyes in aqueous solution, whereas this was not applicable to dyed cotton. The effect of pick-up (0%-150% with an interval of 75%) on reactive-dyed cotton was greater than the effect of initial dye concentration (which varied from 120 to 40 mg/L) on the colour yield of aqueous reactive dyes. Note de contenu : - EXPERIMENTAL : Material - Apparatus - Pretreatments and dyeing of cotton fabrics - Ozonation - Analytical methods - Kinetics studies - RESULTS AND DISCUSSION : UV-vis absorption and K/S curves - Colour yield mechanism and FTIR analysis - Kinetics reaction order of ozonation - The change in rate constants with pH during the ozonation of reactive dyes and reactive-dyed cotton - The change in rate constants with temperature in the ozonation of reactive dyes and reactive-dyed cotton - The change in rate constants with initial dye concentration during the ozonation of reactive dyes and pick-up of ozonation on reactive-dyed cotton - Table 1 : Chemical structure λ max of the dyes' dominant sector DOI : https://doi.org/10.1111/cote.12534 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12534 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36102 [article]

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