Isolation of colour components from flowers of Tabebuia argentea: kinetic and adsorption studies on silk yarn / Konaghatta Narayanachar Vinod in COLORATION TECHNOLOGY, Vol. 127, N° 3 (2011)  

[article]  inCOLORATION TECHNOLOGY > Vol. 127, N° 3 (2011) . - p. 205-209 Titre : Isolation of colour components from flowers of Tabebuia argentea: kinetic and adsorption studies on silk yarn Type de document : texte imprimé Auteurs : Konaghatta Narayanachar Vinod, Auteur ; Puttaswamy, Auteur ; Kurikempanadoddi Ningewoda Ninge Gowda, Auteur ; Rajagopal Sudhakar, Auteur Année de publication : 2011 Article en page(s) : p. 205-209 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Adsorption Colorants végétaux Gallate d'épigallocatéchine Le gallate d'épigallocatéchine (EGCG) est l'ester d'épigallocatéchine et d'acide gallique. C'est le flavanol le plus abondant du thé, connu pour être un puissant antioxydant. On le trouve essentiellement dans le thé blanc, le thé vert et, dans une moindre mesure, le thé noir — lors de la production de ce dernier, les flavanols sont convertis essentiellement en théaflavines et en théarubigines2. On le trouve également dans de nombreux légumes, dans les fruits à coque ainsi que dans la poudre de caroubier à un taux de 1,09 mg·g-1. Soie et constituants Teinture -- Fibres textiles Index. décimale : 667.3 Teinture et impression des tissus Résumé : The colour components from the flowers of Tabebuia argentea have been isolated and characterised as rutin and epigallocatechin gallate using spectral techniques. Adsorption kinetic and thermodynamic studies of these colour components on silk yarn have been investigated. It is noted that the adsorption is an endothermic process. The dyeing studies have been carried out at pH 4. The mordanting studies revealed that the post-mordanting technique could only increase the dye performance marginally. The fastness properties of the dyed silk were determined. The adsorption isotherm studies showed that the Langmuir model fitted the experimental data very well with a high regression coefficient. Note de contenu : EXPERIMENTAL : Materials - Methods - Adsorption isotherm studies RESULTS AND DISCUSSION : Characterisation of the colour components - Effect of concentration of dye on absorption and colour strength - Effect or mordanting - Effect of pH - Kinetic studies - Adsorption studies DOI : 10.1111/j.1478-4408.2011.00300.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2011.00300.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12201 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
013033	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Natural colorant from the bark of Macaranga peltata: kinetic and adsorption studies on silk / Konaghatta Narayanachar Vinod in COLORATION TECHNOLOGY, Vol. 126, N° 1 (2010)  

[article]  inCOLORATION TECHNOLOGY > Vol. 126, N° 1 (2010) . - p. 48-53 Titre : Natural colorant from the bark of Macaranga peltata: kinetic and adsorption studies on silk Type de document : texte imprimé Auteurs : Konaghatta Narayanachar Vinod, Auteur ; Rajagopal Sudhakar, Auteur ; Kurikempanadoddi Ningewoda Ninge Gowda, Auteur ; Puttaswamy, Auteur Année de publication : 2010 Article en page(s) : p. 48-53 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.3 Teinture et impression des tissus Résumé : The colour component from the bark of Macaranga peltata has been extracted and, using spectral techniques, the main colouring ingredient has been identified as ellagic acid. The dyeing properties of the extract on silk have been studied. The colour coordinates of the dyed samples were found to be in the yellow–red quadrant of the colour space diagram and the dyed samples exhibited acceptable fastness properties. The effect of temperature and dye concentration on the rate of dyeing has been studied. Adsorption studies revealed that the process fits well with the Langmuir isotherm model. The thermodynamic parameters of the dyeing process have been evaluated using an Arrhenius plot. The experimental results revealed that the adsorption was exothermic and spontaneous in nature, and exhibited first-order kinetics. Further, the effect of electrolyte on rate of dyeing has also been recorded. The rate of adsorption increases as the disrupting effect of the added electrolyte cation increases and follows the order: Al3+ > Ca2+ > Na+. DOI : 10.1111/j.1478-4408.2009.00228.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2009.00228.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=8418 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
011984	-	Périodique	Bibliothèque principale	Documentaires	Disponible

Oxidative decolorisation of Eriochrome Black T with Chloramine-T : kinetic, mechanistic, and spectrophotometric approaches / Adalegere S. Manjunatha in COLORATION TECHNOLOGY, Vol. 130, N° 5 (10/2014)  

[article]  inCOLORATION TECHNOLOGY > Vol. 130, N° 5 (10/2014) . - p. 340-348 Titre : Oxidative decolorisation of Eriochrome Black T with Chloramine-T : kinetic, mechanistic, and spectrophotometric approaches Type de document : texte imprimé Auteurs : Adalegere S. Manjunatha, Auteur ; Anu Sukhdev, Auteur ; Puttaswamy, Auteur Année de publication : 2014 Article en page(s) : p. 340-348 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Colorants -- Oxydation Décoloration Eaux usées -- Recyclage Tags : 'Milieu  acide'  alcalin'  'Chloramine-T'  'Eriochrome  Black  T'  'Sodium  N-chloro-p-toluenesulfonamide' Index. décimale : 667.3 Teinture et impression des tissus Résumé : The kinetics and mechanism of oxidative decolorisation of Eriochrome Black T (EBT) with sodium N-chloro-p-toluenesulfonamide or Chloramine-T (CAT), catalysed by osmium tetroxide [Os(VIII)] in alkaline medium and uncatalysed in acid medium, have been spectrophotometrically investigated at 303 K. The reaction exhibited a first-order dependence of rate on [CAT]0 and [EBT]0 in both media, and also with respect to [H+]. The order with respect to [OH-] and [Os(VIII)] was fractional. Activation parameters were deduced. It was observed that the uncatalysed decolorisation reaction was ca. eightfold faster in acid medium in comparison with alkaline medium, while the Os(VIII)-catalysed reaction was ca. sevenfold faster than the uncatalysed reaction. Mechanisms and rate laws were determined. The chemical oxygen demand of Eriochrome Black T dye was also determined. Importantly, the developed oxidative decolorisation method is simple, efficient, inexpensive, requires less time, and is environmentally benign. Hence, it can be adapted for treating Eriochrome Black T present in industrial and laboratory wastewater. Note de contenu : - EXPERIMENTAL : 1. Materials and methods - 2. Stoichiometry and characterisation of products - RESULTS AND DISCUSSION : 1. Reactive species of Chloramine-T - 2. Tautomerism of Eriochrome Black T - 3. Reaction scheme and rate law in acid medium - 4. Reaction scheme and rate law in alkaline medium DOI : 10.1111/cote.12104 En ligne : https://onlinelibrary.wiley.com/doi/epdf/10.1111/cote.12104 Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22072 [article]

Réservation

Réserver ce document

Exemplaires (1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
16561	-	Périodique	Bibliothèque principale	Documentaires	Disponible

---

1 (1 - 3 / 3)