Decolorisation by Bacillus flexus of exhausted dyebaths containing CI Acid Red 249 and their reuse for wool dyeing / Neha D. Parmar in COLORATION TECHNOLOGY, Vol. 133, N° 3 (06/2017)  

[article]  inCOLORATION TECHNOLOGY > Vol. 133, N° 3 (06/2017) . - p. 218-222 Titre : Decolorisation by Bacillus flexus of exhausted dyebaths containing CI Acid Red 249 and their reuse for wool dyeing Type de document : texte imprimé Auteurs : Neha D. Parmar, Auteur ; Sanjeev R. Shukla, Auteur Année de publication : 2017 Article en page(s) : p. 218-222 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bactéries Bains de teinture -- Epuration Bains de teinture -- Recyclage Colorants acides Décoloration Laine Photostabilité Résistance au lavage Solidité de la couleur Teinture -- Fibres textiles Index. décimale : 667.3 Teinture et impression des tissus Résumé : A dyebath containing left-over CI Acid Red 249 after dyeing of wool was completely decolorised using an isolated bacteria Bacillus flexus. Optimisation was carried out by varying the pH, temperature, dye concentration, and microbial loading. Complete decolorisation of a 50 mg l?1 dye solution was achieved in 8 h at pH 7 and 37 °C with 10% v/v loading of the bacteria. The decolorised bath was utilised for dyeing of wool fabric with the same dye at 5% shade. This cycle of dyeing–decolorising–dyeing was repeated 5 times. The evaluation of dyed fabric was done using K/S, colour values, and fastness to light and washing. Comparison of a sample dyed with the conventional exhaust process showed that the dyeing quality is not affected for all five successive reuse cycles. The results are important from the viewpoint of reducing water consumption and chemicals. Note de contenu : - EXPERIMENTAL : Dyes and chemicals - Mircoorganism and culture conditions - Decolorisation experiment - Determination of TOC and COD - Wool dyeing - Reuse of the decolorised bath - Dye uptake - Measurement of K/S - Evaluation of washing fastness - Evaluation of yellowness index - Evaluation of light fastness - RESULTS AND DISCUSSION : Optimisationof physicochemicam parameters for AR 249 dye decolorisation - Effect of pH on dyebath decolorisation - Effect of temperature on dyebath decolorisation - Effect of dye concentration on dyebath decolorisation - COD and TOC removal during degradation of AR 249 dye - Colour values for dyeing by repeated used of the decolorised dyebath DOI : 10.1111/cote.12270 En ligne : https://drive.google.com/file/d/1144X26waHSfIs9IgsV9wezIZKoJyHshy/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28646 [article]

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Ionic-liquid-assisted mixed alkali system for reactive dye fixation in a batch process – optimisation through response surface methodology / Umesh B. Kore in COLORATION TECHNOLOGY, Vol. 133, N° 4 (08/2017)  

[article]  inCOLORATION TECHNOLOGY > Vol. 133, N° 4 (08/2017) . - p. 325-333 Titre : Ionic-liquid-assisted mixed alkali system for reactive dye fixation in a batch process – optimisation through response surface methodology Type de document : texte imprimé Auteurs : Umesh B. Kore, Auteur ; Sanjeev R. Shukla, Auteur Année de publication : 2017 Article en page(s) : p. 325-333 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bases (chimie) Colorants réactifs Fixateurs (chimie) Fixation (chimie) Liquides ioniques Teinture -- Fibres textiles Index. décimale : 667.3 Teinture et impression des tissus Résumé : An ionic liquid, choline hydroxide, was synthesised and used in a mixed alkali system for fixation of homobifunctional reactive dyes. Its molecular structure was confirmed using FTIR, 1H NMR, and 13C NMR spectroscopy. Response surface methodology was employed to optimise the dyeing conditions for reactive dyes using a sodium carbonate–choline hydroxide mixed alkali system. A Box–Behnken design with three variables, namely sodium carbonate concentration, choline hydroxide concentration, and fixation time, was used to design the experimental runs. Analysis of variance was used to estimate the statistical parameters and to evaluate the quality of the statistical model fit. The quality and model terms were evaluated using Fisher's F-test, the coefficient of determination, and probability values. The interactive effect of operating variables on the response (K/S) was studied using three-dimensional response surface plots. The results obtained from the solutions of highest desirability were found to be comparable with conventionally used alkali systems, namely sodium carbonate alone and sodium carbonate–sodium hydroxide mixed alkali. The ionic liquid choline hydroxide could be effectively used along with sodium carbonate for fixation of reactive dyes, with the advantage of reductions in pollution load, total dissolved solids, and chemical oxygen demand. Note de contenu : - EXPERIMENTAL : Materials - Methods - Estimation of dye exhaustion - Estimation of total dye fixation - Determination of total dissolved solids - Determination of chemical oxygen demand - Evaluation of fastness properties - Experimental design - RESULTS AND DISCUSSION : Characterisation of IL - Optimisation usijng RSM and its validation - Effect of experimental variables on response (K/S) - Verification of the RSM model and comparison of the alkali systems - Fastness properties DOI : 10.1111/cote.12286 En ligne : https://drive.google.com/file/d/1pMG4uoWKEUIfDXCWPM5fn0LXnQpE8cWb/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28886 [article]

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