Decolorisation of remazol vinyl sulphone reactive dyes by potassium permanganate / Rehana Saeed in COLORATION TECHNOLOGY, Vol. 125, N° 5 (2009)  

[article]  inCOLORATION TECHNOLOGY > Vol. 125, N° 5 (2009) . - p. 277-283 Titre : Decolorisation of remazol vinyl sulphone reactive dyes by potassium permanganate Type de document : texte imprimé Auteurs : Rehana Saeed, Auteur ; M. Javaid Mughal, Auteur ; M. Naeem, Auteur ; S. S. Nizami, Auteur ; Tanzile H. Usmani, Auteur Année de publication : 2009 Article en page(s) : p. 277-283 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.3 Teinture et impression des tissus Résumé : Three Remazol vinyl sulphone-based reactive dyes were selected to investigate their decolorisation by potassium permanganate, in relation to pH, concentration of potassium permanganate and time. The amount of colour removal was measured by ultraviolet–visual spectrometry and it was found that potassium permanganate only partially degraded the dye solution; this was also proved by the percent removal of chemical oxygen demand and total organic carbon. Decolorisation was observed to increase when the pH of the dye solution was decreased. Up to a pH level of 5, the decolorisation efficiency is very much slower, but as the pH level shifts towards 2 the rate of decolorisation becomes relatively faster, while a further decrease in pH results in a rapid change in decolorisation. The concentration of potassium permanganate also showed significant effects on the decolorisation. Rapid decolorisation was observed within 10 min for all three dyes, but after that time the decolorisation became slower. DOI : 10.1111/j.1478-4408.2009.00207.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2009.00207.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6863 [article]

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Effect of a cationising agent on the conventional reactive dyeing of cotton / M. Javaid Mughal in COLORATION TECHNOLOGY, Vol. 124, N° 1 (2008)  

[article]  inCOLORATION TECHNOLOGY > Vol. 124, N° 1 (2008) . - p. 62-65 Titre : Effect of a cationising agent on the conventional reactive dyeing of cotton Type de document : texte imprimé Auteurs : M. Javaid Mughal, Auteur ; M. Naeem, Auteur ; Ausaf Aleem, Auteur ; Rehana Saeed, Auteur ; Kamran Ahmed, Auteur Année de publication : 2009 Article en page(s) : p. 62-65 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.3 Teinture et impression des tissus Résumé : Cationisation of cotton is emerging as an effective tool that may help to solve the environmental problems associated with the dyeing of cotton with reactive dyes. The efficiency of the cationising agent CA200 has been investigated and was found to be more effective when compared with the usual method for reactive dyeing of cotton. Pretreatment of the cotton fabric with the cationising agent increases the rate of dyeing compared with the existing method of reactive dyeing. The colour yields, in terms of the Kubelka–Munk values as a function of the amount of dye fixed, showed that cationisation enhances the colour strength. It also improves the washing fastness, rubbing fastness and depth of shade. The positive environmental impact of this cationisation process is significant and the cationised cotton shows a similar fabric quality as with the normal dyeing process. DOI : 10.1111/j.1478-4408.2007.00122.x En ligne : http://onlinelibrary.wiley.com/doi/10.1111/j.1478-4408.2007.00122.x/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3141 [article]

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