Mechanism and application of ozone fading: Oxidative decolorisation of disperse dyes and waste-dyed polyester fabrics / Jiangfei Lou in COLORATION TECHNOLOGY, Vol. 139, N° 3 (06/2023)  

[article]  inCOLORATION TECHNOLOGY > Vol. 139, N° 3 (06/2023) . - p. 338-349 Titre : Mechanism and application of ozone fading: Oxidative decolorisation of disperse dyes and waste-dyed polyester fabrics Type de document : texte imprimé Auteurs : Jiangfei Lou, Auteur ; Lamei Ren, Auteur ; Jiugang Yuan, Auteur ; Jing Xu, Auteur ; Zhengbiao Gu, Auteur ; Xuerong Fan, Auteur Année de publication : 2023 Article en page(s) : p. 338-349 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bleu (couleur) Caractérisation Colorants -- Oxydation Décoloration Fibres textiles -- Surfaces Mesure Orange (couleur) Ozone Polyesters Textiles et tissus teints Index. décimale : 667.3 Teinture et impression des tissus Résumé : As the most common synthetic fibre, polyester has consistently been in high demand and usage, but its recycling has always been a problem for the textile industry. The decolorisation of dyed polyester is the key to expanding its recycling use, and there is no rapid, effective and simple decolorisation method. In this study, ozone was used to decolorise dispersed dyes developed for polyester. Ozone was effective in decolorising CI Disperse Orange 30 and CI Disperse Blue 60, and the process was extended to the decolorisation of dyed polyester fabric. Based on single factor analysis, the optimum decolorisation technological conditions were: an ozone feed rate of 130 mg L−1 min−1, treatment time of 2 hours, wet pick-up of 100% and pH value of 3, with which the decolorisation rate and colour difference values could exceed 45% and 6%, respectively. The changes in dye structure during the process of ozone decolorisation were analysed using scanning electron microscopy, X-ray diffraction and Fourier Transform–infrared spectroscopy, and the mechanism of ozone decolorisation was also investigated. The results showed that the crystallinity decreased from 41.18% to 36.30% with a strength retention rate of above 80%, and demonstrated that ozone can be used on polyester fabric and dye simultaneously. The aim of entering the fibre was achieved by etching the polyester and decolorisation was achieved by oxidising the chromaticity groups. Note de contenu : - EXPERIMENTAL : Materials and chemicals - Dyeing of the PET fabrics - Monitoring of the ozone feed rate - Optimum decolorisation technological conditions - Exploration of the decolorisation mechanism - Characterisation and measurement - RESULTS AND DISCUSSION : Optimum decolorisation technological conditions - Application of the optimum decolorisation technological conditions - Surface morphology of PET fabrics treated with ozone - Decolorisation of dispersed dye with ozone - Table 1 : Names, classes and structures of the dyes used in this study - Table 2 : Ozone feed rates used in this study - Table 3 : Dyeing conditions of treated samples - Table 4 : CIElab values of the ozone-treated and reference-dyed PET DOI : https://doi.org/10.1111/cote.12654 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12654 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39543 [article]

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