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. 2016 May;7(3):473-82.
doi: 10.1016/j.jare.2016.03.006. Epub 2016 Mar 29.

An eco-friendly dyeing of woolen yarn by Terminalia chebula extract with evaluations of kinetic and adsorption characteristics

Mohd Shabbir  1 , Luqman Jameel Rather  1 , Shahid-Ul-Islam  1 , Mohd Nadeem Bukhari  1 , Mohd Shahid  1 , Mohd Ali Khan  2 , Faqeer Mohammad  1
Affiliations

An eco-friendly dyeing of woolen yarn by Terminalia chebula extract with evaluations of kinetic and adsorption characteristics

Mohd Shabbir et al. J Adv Res. 2016 May.

Abstract

In the present study Terminalia chebula was used as an eco-friendly natural colorant for sustainable textile coloration of woolen yarn with primary emphasis on thermodynamic and kinetic adsorption aspects of dyeing processes. Polyphenols and ellagitannins are the main coloring components of the dye extract. Assessment of the effect of pH on dye adsorption showed an increase in adsorption capacity with decreasing pH. Effect of temperature on dye adsorption showed 80 °C as optimum temperature for wool dyeing with T. chebula dye extract. Two kinetic equations, namely pseudo first-order and pseudo second-order equations, were employed to investigate the adsorption rates. Pseudo second-order model provided the best fit (R (2) = 0.9908) to the experimental data. The equilibrium adsorption data were fitted by Freundlich and Langmuir isotherm models. The adsorption behavior accorded well (R (2) = 0.9937) with Langmuir isotherm model. Variety of eco-friendly and sustainable shades were developed in combination with small amount of metallic mordants and assessed in terms of colorimetric (CIEL(∗) a (∗) b (∗) and K/S) properties measured using spectrophotometer under D65 illuminant (10° standard observer). The fastness properties of dyed woolen yarn against light, washing, dry and wet rubbing were also evaluated.

Keywords: Adsorption; Color strength; Dyeing; Fastness properties; Mordants; Polyphenols.

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Figures

None
Graphical abstract
Fig. 1
Fig. 1
(a) UV–Vis spectra of T. chebula natural dye. (b) UV–Visible spectra of metal treated dye solutions.
Fig. 2
Fig. 2
(a) FT-IR spectra of undyed and dyed woolen yarn. (b) Probable scheme for interaction of dye and wool surface. (c) Thermal stability of T. chebula dye by thermogravimetric analysis (TGA).
Fig. 3
Fig. 3
(a) Dye exhaustion at different pH. (b) Dye exhaustion at different temperature. (c) Variation of adsorption capacity with initial dye concentration.
Fig. 4
Fig. 4
(a) Sorption isotherms of T. chebula onto woolen yarn at pH 4 and temperature 80 °C with initial dye concentration 1 g L−1. (b) Langmuir adsorption isotherm. (c) Freundlich adsorption isotherm.
Fig. 5
Fig. 5
(a) Adsorption kinetic curve of T. chebula onto woolen yarn at pH 4 and temperature 80 °C with initial dye concentration 1 g L−1. (b) Pseudo first-order kinetic model. (c) Pseudo second-order kinetic model.
Fig. 6
Fig. 6
(a) a∗b∗ plot of T. chebula dyed woolen yarn. (b) Effect of metal salts on the color strength woolen yarn dyed with 1 g L−1 of T. chebula dye.
None
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