Inhibitive Effect of NaCl and Citric Acid on the Colour Yield of Acid Dye on Nylon Fabric

Abstract

Nylon 6 fabric was dyed with C.I. Acid Yellow 23 at a temperature 50˚C using sodium chloride (NaCl) and citric acid as auxiliaries. The adsorption kinetic mechanism was studied using two models. Results of the UV-Vis spectroscopy indicated that colour yield of C.I. Acid Yellow 23 reduced when more than 1% (acid) and 5% (salt) concentration were used respectively for dyeing. NaCl however had the most inhibitive effect on the dye colour yield. The adsorption kinetics mechanism result fitted the pseudo-second-order-kinetic model with R 2 of 0.993.

Sustainable Dyeing Process for Nylon 6 Fabrics by Rhubarb Flower Using Different Bio-Mordants

“…In addition, charge neutralization of the dye anions by the electrolyte cations (Na + ) affects the dye substantivity and inhibits the interaction with the nylon 6 fiber cations. Increase in salt concentration therefore inhibits dye exhaustion and consequently decreases the color strength of the dyed nylon 6 fabric [34,35]. Applying a dispersing agent in natural dyeing is important as the dye molecules may be aggregated.…”

Adsorption of Dye-extract from Peristophe roxburghiana onto Cotton: Mechanism, and Kinetic Evaluations

“…Peristophe roxburghiana plant which gives a natural reddish colored dyestuff, containing components such as phenoxazine, alkaloid, carotenoids, and pelargonidin have been found to be an anthocyanin dye [1]. Dye is isolated from it by using several extraction techniques [18,19,20]. Color obtained from peristophe, plants species are extensively used as food additive, [1,19].…”

“…Color obtained from peristophe, plants species are extensively used as food additive, [1,19]. This plant has also found its use like many other natural colorants as medicinal remedies for the management and treatment of some ailments [18,20] and in dyeing of cotton fabric [1,19]. In our previous work, review on its application in textile coloration have been published [1], this paper investigates the adsorption mechanism and kinetics response of dye-extract from Peristophe roxburghiana onto cotton sample, this enables dye manufacturer, and handlers to understand the conditions that affect this class of dye, nature of the interaction between the dye and cotton molecules.…”