Colour stripping of reactive-dyed cotton by ozone treatment / Semiha Eren in COLORATION TECHNOLOGY, Vol. 132, N° 6 (12/2016)  

[article]  inCOLORATION TECHNOLOGY > Vol. 132, N° 6 (12/2016) . - p. 466-471 Titre : Colour stripping of reactive-dyed cotton by ozone treatment Type de document : texte imprimé Auteurs : Semiha Eren, Auteur ; Buse Gümüs, Auteur ; Hüseyin Aksel Eren, Auteur Année de publication : 2016 Article en page(s) : p. 466-471 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants réactifs -- Détérioration 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). Décapage Ozonation Index. décimale : 667.3 Teinture et impression des tissus Résumé : Trials have been carried out to investigate the efficiency of ozone treatment in the colour stripping of reactive-dyed cotton fabrics. The trials were performed on a specially designed apparatus to inject ozone gas into the liquor passing through a perforated beam with fabric rolls on it, just like a beam dyeing machine with ozone venturi injection. Conventional reductive colour stripping was applied as the control treatment, and ozone treatment was applied for three different application times (15, 30, and 45 min). Trials were performed with seven selected reactive dyes having various chromophores and reactive groups. The results indicate that 45 min ozone treatment yielded the best colour stripping results among the three application times. Furthermore, the colour stripping percentages of the 45 min ozone treatment were higher for four of the tested dyes, the same for one of the tested dyes, and lower for two of the tested dyes compared with the control treatment, which consisted of conventional reductive colour stripping. Colour stripping of 90% and above was achieved for all samples of the 45 min ozone treatment. The chemical oxygen demand values of the colour stripping baths were compared: the average value of the 45 min ozone application baths was 105 mg l?1, and it was 1993 mg l?1 for the conventional reductive treatment baths. Consequently, a reduction in chemical oxygen demand of almost 94% was achieved by ozone treatment compared with conventional reductive treatment. The strength values of the fabrics after the respective treatments were similar, with a difference of only 3%. Note de contenu : - EXPERIMENTAL : Materials - Dyeing of the substrates - Colour stripping of the dyed cotton fabric - Ozone application procedure - Dyeing of the colour-stripped samples - Colour strenght and colour stripping percentage measurements - Wash fastness evaluation - Fabric tensile streght measurements - Chemical oxygen demand evaluation - RESULTS AND DISCUSSION : Colour stripping percentages of the dyed fabrics after different stripping treatment - Colour yield and colour differences of the samples dyed black - Environmental benefit of the ozone treatment - Strength of the samples DOI : 10.1111/cote.12240 En ligne : https://drive.google.com/file/d/1IJvuq1dyPpnMhj-oikCXhcQOwCmrzhtr/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27284 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
18506	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Degradation studies of CI Reactive Blue 19 on biodegraded cellulosic fabrics via liquid chromatography-photodiode array detection coupled to high resolution mass spectrometry / Nadia Sultana in COLORATION TECHNOLOGY, Vol. 135, N° 6 (12/2019)  

[article]  inCOLORATION TECHNOLOGY > Vol. 135, N° 6 (12/2019) . - p. 475-483 Titre : Degradation studies of CI Reactive Blue 19 on biodegraded cellulosic fabrics via liquid chromatography-photodiode array detection coupled to high resolution mass spectrometry Type de document : texte imprimé Auteurs : Nadia Sultana, Auteur ; Kelsey Williams, Auteur ; Mary Ankeny, Auteur ; Nelson R. Vinueza, Auteur Année de publication : 2019 Article en page(s) : p. 475-483 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse quantitative (chimie) Bleu (couleur) Colorants -- Analyse Colorants réactifs -- Biodégradation Colorants réactifs -- Détérioration Fibres cellulosiques Teinture -- Fibres textiles synthétiques Index. décimale : 667.2 Colorants et pigments Résumé : When textile substrates biodegrade in landfills, the fate of textile colorants is unknown, and potentially poses an ecotoxic threat. In this study, we developed a systematic analytical method to evaluate the biodegradation of reactive dyes, the most common class of dye applied to cotton fabrics. The cotton fabrics were dyed with CI Reactive Blue 19 and biodegraded in soil in a laboratory-controlled environment over intervals of 45 and 90 days. A dye isolation method using a low concentration of alkali (0.15% sodium hydroxide) was developed and applied (80°C for 1 hour) to isolate intact and degraded dye from the fabric samples. To quantify the intact dye isolated from the fabric samples, a quantification method was then developed using liquid chromatography-photodiode array detection. The quantification method provided excellent linearity (R2 = 0.9997 ± 0.0002), accuracy (% error = -2% ± 4), precision (% coefficient of variation = 2% ± 4) and sensitivity (lower limit of quantification = 0.4 ± 0.2 µg/mL) for concentrations ranging from 1 to 50 µg/mL. After validation, the method was applied and showed a reduction of dye in biodegraded samples (after 45 and 90 days) compared with undegraded control samples (0 days). To characterise the isolated dye degradation product, quadrupole time-of-flight tandem mass spectrometry was utilised. Analysis showed that the degradation product was formed by losing a -SO3- group from the intact hydrolysed form of the dye, creating a more hydrophobic degradation product compared with the intact hydrolysed form of dye. Note de contenu : - EXPERIMENTAL : Materials and reagents - Biodegradation of dyes fabric samples - Dye isolation method - Synthesis of hydrolysed dye standard - Quantitative monitoring of degradation - RESULTS AND DISCUSSION : Characterisation of synthesised hydrolysed dye standard - Analysis of undegraded control sample - Validation of quantification method - Quantification of dyes on biodegraded samples DOI : 10.1111/cote.12440 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12440 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33379 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
21322	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Photoassisted degradation of CI reactive red 195 using and Fe(III)-grafted polytetrafluoroethylene fibre complex as a novel heterogeneous Fenton catalyst over a wide pH range / Bing Li in COLORATION TECHNOLOGY, Vol. 129, N° 6 (12/2013)  

[article]  inCOLORATION TECHNOLOGY > Vol. 129, N° 6 (12/2013) . - p. 403-411 Titre : Photoassisted degradation of CI reactive red 195 using and Fe(III)-grafted polytetrafluoroethylene fibre complex as a novel heterogeneous Fenton catalyst over a wide pH range Type de document : texte imprimé Auteurs : Bing Li, Auteur ; Yongchun Dong, Auteur ; Ding Zhizhong, Auteur Année de publication : 2013 Article en page(s) : p. 403-411 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : acrylique, Acide L'acide acrylique ou acide acroléïque ou acide prop-2-énoïque est un composé organique de formule brute C3H4O2 et de formule semi-développée CH2=CHCOOH. C'est un acide carboxylique et un alcène vinylique, et se présente comme un liquide incolore à l'odeur âcre. L'acide acrylique et ses esters, les acrylates, sont utilisés dans la fabrication de matières plastiques, dans les peintures acryliques et dans divers autres polyacryliques qui ont de multiples usages. Catalyse hétérogène Colorants azoïques Colorants réactifs -- Détérioration Colorants réactifs -- Effets du rayonnement ultraviolet Copolymères greffés Fenton, Réaction de Fer trivalent Greffage (chimie) Ions cuivre Oxydation pH Polytétrafluoréthylène Teinture -- Fibres textiles synthétiques Index. décimale : 667.3 Teinture et impression des tissus Résumé : Polytetrafluoroethylene fibre was grafted with acrylic acid to form an effective ligand, which coordinated with Fe(III) ions to prepare an Fe(III)-grafted polytetrafluoroethylene fibre complex. The photoassisted degradation of a typical azo dye, CI Reactive Red 195, using the Fe(III)-grafted polytetrafluoroethylene fibre complex as a novel heterogeneous Fenton catalyst in a wide pH range of 3–9 was investigated. In order to achieve better degradation in a higher pH range, the effect of Fe content, incorporation of Cu(II) ions and UV light irradiation on dye degradation was also examined. The results indicated that dye degradation was effective in the presence of the Fe(III)-grafted polytetrafluoroethylene fibre complex. Fast degradation of the dye can take place in an acidic environment. Increasing the Fe content or incorporating Cu(II) ions can significantly accelerate dye degradation, and UV light irradiation is much more effective than visible light irradiation in a higher pH range, especially in the alkaline pH range. Note de contenu : - EXPERIMENTAL : Materials and reagents - Graft polymerization of polytetrafluoroethylene fibres - Preparation of metal-grafted fibre complexes - Charaterisation of metal-grafted fibre complexes - Photocatalytic reaction set-up - Degradation procedure and analysis - RESULTS AND DISCUSSION : Characterisation of metal-grafted fibre complexes - Metal ions leaching from the catalyst - Heterogeneous decomposition of dye at different solution pH - Fe content of the catalyst - Cu(II) ion as the assistant metal ion - UV light irradiation DOI : 10.1111/cote.12049 En ligne : http://onlinelibrary.wiley.com/doi/10.1111/cote.12049/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19739 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
15730	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Quantitative structure–property relationship modelling for photoreduction-fast azo dyes on a nylon substrate : a methodology for thermochemical analysis of the photocleavage of azo dyes using the RM1 semi-empirical molecular orbital method / Yasuyo Okada in COLORATION TECHNOLOGY, Vol. 133, N° 2 (04/2017)  

[article]  inCOLORATION TECHNOLOGY > Vol. 133, N° 2 (04/2017) . - p. 98-115 Titre : Quantitative structure–property relationship modelling for photoreduction-fast azo dyes on a nylon substrate : a methodology for thermochemical analysis of the photocleavage of azo dyes using the RM1 semi-empirical molecular orbital method Type de document : texte imprimé Auteurs : Yasuyo Okada, Auteur ; Zenzo Morita, Auteur Année de publication : 2017 Article en page(s) : p. 98-115 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants azoïques Colorants réactifs -- Détérioration Décoloration Orbitales moléculaires Photochimie Polyamide 66 Relations structure-propriétés Teinture -- Fibres textiles synthétiques Thermochimie Index. décimale : 667.3 Teinture et impression des tissus Résumé : The rates of fading of 18 reactive azo dyes on polyamide fabrics and films upon exposure to a carbon arc in air have been determined from the initial slopes. The rates have been thermochemically analysed by calculating the heats of formation of the reactants, intermediates, and products by chemical equations describing (1) the second-order disproportionation (redox reaction) between the photoinduced hydrazinyl radicals and (2) the intramolecular H-transfer (self-decomposition) of the radicals, using the RM1 semi-empirical molecular orbital method. The rates of azo cleavage (or reductive fading) were studied to correlate the molecular structures with three molecular descriptors: (a) the heats of reaction for two reaction pathways, (b) the thermodynamic stability of the photoinduced hydrazinyl radicals, and (c) the quantum yields of generation. The possibility of structure optimisation of the examined azo dyes is discussed from the perspectives of (a) and (b). The light fastness of several previously reported substituted phenylazophenol (model) dyes on a polyamide substrate has been analysed by the same procedure. Two of the latter dyes exhibit typical photoreduction-fast properties, which determine the threshold ?rH°(gas) value of the N11-hydrazinyl dye radical for (1), indicating that the chemical structures of azo dyes may, in principle, be modified to include reduction-fast azo groups. The current state of reactive azo dyes is considerably below the level required to achieve reduction-fast dye. The chemical structures of current reactive azo dyes appear not to have been optimised on the basis of the molecular descriptors (a) and (b), and only insufficiently on the basis of (c). Note de contenu : - EXPERIMENTS AND MO CALCULATION : Dyes used - Materials : dyeing and exposure - MO calculations - RESULTS AND DISCUSSION : Photochemical reactions of photoinduced (MHN) radicals - Thermochemical analysis based on the reactions of photoinduced (MHN) radicals - Extension of the structure range to substituted phenylazo-p-phenol dyes - Possibility of innovating reduction-fast azo dyes by optimising several factors DOI : 10.1111/cote.12265 En ligne : https://drive.google.com/file/d/1WHzXJ7HA1Q_vbZqT39915HMwx6mTJOfI/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28223 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
18801	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Study of the cytotoxicity of reactive dyeing effluent treated by Fenton oxidation / Chung-Hin Chui in COLORATION TECHNOLOGY, Vol. 129, N° 6 (12/2013)  

[article]  inCOLORATION TECHNOLOGY > Vol. 129, N° 6 (12/2013) . - p. 398-402 Titre : Study of the cytotoxicity of reactive dyeing effluent treated by Fenton oxidation Type de document : texte imprimé Auteurs : Chung-Hin Chui, Auteur ; Kun-Wai Man, Auteur ; Wai-Fung Tsang, Auteur ; Pik-Ling Lam, Auteur ; Kelvin Sze-Yin Leung, Auteur ; Wai-Yeung Wong, Auteur ; Chi-Wai Kan, Auteur ; Kim-Hung Lam, Auteur Année de publication : 2013 Article en page(s) : p. 398-402 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants réactifs -- Détérioration Décoloration Eaux usées -- Décontamination Fenton, Réaction de Oxydation Tests cutanés Tests de toxicité Toxicologie cellulaire Index. décimale : 667.3 Teinture et impression des tissus Résumé : Fenton oxidative wastewater treatment of CI Reactive Black 5 and CI Reactive Blue 19 effluent was performed after a simulated laboratory-scale dyeing process, and the cytotoxicity of the treated effluent was evaluated using human skin cell lines. Among the components for Fenton oxidation, the human skin cell results showed that iron(II)sulfate at 150 mm did not show any significant cytotoxic effect, while other components, such as Glauber's salt solution (20 g l−1; 14%), CI Reactive Black 5 (30 mg l−1; 24%), caustic soda (5 g l−1; 30%), CI Reactive Blue 19 (30 mg l−1; 32%), hydrogen peroxide (0.01 m) and soda ash (5 g l−1) showed cytotoxic potential; the reagent sodium sulfite (30 mm; 48%) exhibited the strongest cytotoxicity level. Fast decolorisation (>95%) was achieved within 10 min for CI Reactive Black 5, while for CI Reactive Blue 19 it took longer (1.5 h) to achieve the same decolorisation. Studies showed that decolorisation for both dyes followed second-order kinetics. In spite of the remarkable efficacy of the Fenton oxidation process in removing colour within a short period of time, the resulting treated wastewater (within a reaction time of 1.5 h) also showed cytotoxicity towards the human HaCaT skin keratinocyte cell line. This observation can be explained by the strong oxidant and intermediate species produced during the advanced oxidation process, and a treatment step using sodium sulfite and a prolonged residence time can help to reduce the cytotoxicity. Note de contenu : - EXPERIMENTAL : Reagents and instruments - Laboratory-scale dyeing process - Cytotoxicity tests - Study of decolorisation kinetics - RESULTS AND DISCUSSION : Study of dye decolorisation kinetics - Cytotoxicity tests DOI : 10.1111/cote.12055 En ligne : http://onlinelibrary.wiley.com/doi/10.1111/cote.12055/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19738 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
15730	-	Périodique	Bibliothèque principale	Documentaires	Disponible

---

1 (1 - 5 / 5)