Abstract
In this study, wool fibers are dyed with a natural colorant extracted from walnut bark in presence and absence of mordants. The effect of aluminum sulfate, ferrous sulfate, and stannous chloride mordants on colorimetric and fastness properties of wool fibers was investigated. Juglone was identified as the main coloring component in walnut bark extract by UV visible and FTIR spectroscopic techniques. The results showed that pretreatment with metallic mordants substantially improved the colorimetric and fastness properties of wool fibers dyed with walnut bark extract. Ferrous sulfate and stannous chloride mordanted wool fibers shows best results than potassium aluminum sulfate mordanted and unmordanted wool fibers. This is ascribed due to strong chelating power of ferrous sulfate and stannous chloride mordants.
Highlights
Synthetic colorants in view of cheaper price, wide range of colors, and considerable improved fastness properties are extensively used in textile industries for dyeing of different textile materials (El-Nagar et al 2005; Islam and Mohammad 2014)
The interaction between woolen yarn samples, mordants, and dye molecules was studied on the basis of enhanced color strength values (K/S) after mordanting and dyeing processes
UV absorption and Fourier transform infrared spectroscopy (FTIR) spectral studies Absorption spectra of natural dyes depends upon the nature, number, and position of chromophore and auxochromic groups, as well as the type and polarity of the solvent used for analyzing absorption spectra (Oakes & Dixon 2004)
Summary
Synthetic colorants in view of cheaper price, wide range of colors, and considerable improved fastness properties are extensively used in textile industries for dyeing of different textile materials (El-Nagar et al 2005; Islam and Mohammad 2014). Enhanced environmental awareness has motivated researchers to reintroduce natural colorants from natural sources like plants (stem, bark, leaves, roots, and flowers), animals, and minerals (Samanta and Agarwal 2009; Shahid et al 2012; Shahid et al 2013) In addition to their biodegradability and compatibility with the environment, natural colorants have been recently discovered to exhibit other functional properties, such as antimicrobial activity (Khan et al 2012; Yusuf et al 2015), insect repellent (Ali et al 2013), fluorescence (Rather et al 2015), UV protection (Grifoni et al 2009; Sun and Tang 2011), and deodorizing (Lee et al 2009). Natural colorants are among potential candidates for developing green textile dyeing process and serving as better alternatives or copartners to toxic synthetic colorants (Islam et al 2014)
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