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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]
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 teintsIndex. 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 PETDOI : https://doi.org/10.1111/cote.12654 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12654 Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=39543
in COLORATION TECHNOLOGY > Vol. 139, N° 3 (06/2023) . - p. 338-349[article]Réservation
Réserver ce documentA novel strategy to improve the dyeing properties in laccase-mediated coloration of wool fabric / Ting Zhang in COLORATION TECHNOLOGY, Vol. 133, N° 1 (02/2017)
[article]
Titre : A novel strategy to improve the dyeing properties in laccase-mediated coloration of wool fabric Type de document : texte imprimé Auteurs : Ting Zhang, Auteur ; Rubing Bai, Auteur ; Qiang Wang, Auteur ; Xuerong Fan, Auteur ; Ping Wang, Auteur ; Jiugang Yuan, Auteur ; Yuanyuan Yu, Auteur Année de publication : 2017 Article en page(s) : p. 65–72 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorimétrie
LaccasesLes laccases (EC 1.10.3.2) appartiennent à une famille d'enzymes ayant pour cofacteur du cuivre. C'est une oxydase (oxydoréductase, EC 1) que l'on retrouve dans de nombreuses plantes, champignons et micro-organismes.
Le cuivre est lié sur plusieurs sites de la protéine. On distingue trois types. Les types 2 et 3 sont appelés grappe tri-nucléaire. Le cuivre du type 1 est soluble dans l'eau. Le mercure déplace le cobalt complexé dans les laccases. Les complexants du cuivre peuvent le déplacer et le remplacer par du cobalt. Les cyanures complexent également le cuivre, mais dans ce cas il n'est pas possible de réinsérer du cobalt.
Les laccases oxydent les dérivés phénoliques mais d'une façon ménagée qui transforme la lignine en monolignol.
Laine
Microscopie
Polymérisation
Solidité de la couleur
Spectroscopie ultraviolette
Surfaces -- Analyse
Syringique, Acide
Teinture -- Fibres textilesIndex. décimale : 667.3 Teinture et impression des tissus Résumé : Enzymatic coloration of fabrics has received worldwide attention in recent years. In order to improve the dyeing properties of enzymatically coloured fabrics, a novel strategy using 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (EDC), a biological coupling agent, to pretreat wool fabric was employed in this paper. Enzymatic coloration of wool fabrics with syringic acid was carried out in the presence of laccase from Trametes versicolor. The effect of different periods on laccase-catalysed polymerisation of syringic acid was examined by UV-vis spectroscopy. Enzymatic coloration results of dyed wool fabrics were evaluated by means of K/S value and colour difference (?E*). Process parameters, including the dosages of syringic acid and incubation time, that influenced the colour depth were studied. Meanwhile, the colour fastness and levelness of dyed wool fabrics were tested. The results showed that the UV-vis absorbance of reaction solution increased as oxidation time elapsed, and a new peak appeared at 360 nm. After pretreatment, the K/S values and colour difference values of wool fabrics dyed with poly(syringic acid) improved appreciably compared with the control samples without any pretreatment. Moreover, pretreated wool fabrics showed better dyeing fastness and levelness than control samples. Note de contenu : - MATERIALS AND METHODS : Pretreatment of wool fabric - Laccase-mediated coloration of wool fabric - UV-vis spectrum analysis - Colour parameter measurement of dyed wool fabric - Surface morphology - Microscopic analysis of wool yarn cross-section - Colour fastness tests
- RESULTS AND DISCUSSION : UV-vis spectra of phenolic acid compound - Colour characteristics of dyed wool fabrics - Surface morphology of wool fabrics - Effects of monomer concentration and incubation time on the colour depth of dyed wool fabrics - Yarn cross-section microscopic analysis - Colour fastness testsDOI : 10.1111/cote.12252 En ligne : https://drive.google.com/file/d/1haab813CNbkDRxt-GXoKDhFiLU_n87uv/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27882
in COLORATION TECHNOLOGY > Vol. 133, N° 1 (02/2017) . - p. 65–72[article]Réservation
Réserver ce document