Investigation into the color stripping of the pigment printed cotton fabric using the ozone assisted process: A study on the decolorization and characterization

Abstract

Color stripping is one of the most convenient ways to rectify the various shade faults occurred during printing or dyeing process of textiles. But, the conventional chemical assisted process poses serious risk of the environmental pollution. Secondly, the chemical recycling of the cellulosic fibers may be disrupted due to the presence of the impurities like colorants, finishes, and the additives in the discarded textiles. So, there is a need to study ways to remove such impurities from the discarded cellulosic textiles in a sustainable manner. This work examines the decolorization of the pigment prints on cellulosic fabrics at pilot scale using an ozone-assisted process. The effect of varying pH, ozone concentration and the treatment time on the decolorization of the pigment prints was optimized using the response surface methodology technique. The effects of ozonation process parameters on the mechanical properties of cellulosic cotton fabric were measured. Decolorization of pigment printed samples was studied with respect to the surface effects by a scanning electron microscopy (SEM), and the chemical removal effects of ozonation treatment were studied using X-ray photoelectron spectroscopy. The possible mechanism regarding the action of ozone for the decolorization is discussed.

Decolorization of the Reactive Dyed Cotton Fabrics with the Use of Ozone Assisted Eco-technology

“…The CIELAB color space commonly known as CIE L*a*b* was defined in 1976 by the International Commission on Illumination (CIE). In the CIELAB color space, L* stands for the lightness (0 = black, 100 = white), a* stands for the red-green coordinate from (positive sign = red, negative sign = green) and b* stands for the yellow-blue coordinate from (positive sign = yellow, negative sign = blue) [7].…”

Recent advances in recycling technologies for waste textile fabrics: a review

“…Various research on dye removal has been done with recent work that carries out the decolorization process of textile fabrics at a pilot scale using an ozone-assisted process. 111 Powar et al 111 decolorized 90% and above pigment-printed cellulosic textiles using the ozoneassisted process in an acidic solution. He et al 112 concluded that ultraviolet (UV)/Na 2 S 2 O 4 with a photocatalytic system could effectively strip fixed reactive dyes, with a relatively high tensile strength retention observed from cotton fibers.…”

“…Various research on dye removal has been done with recent work that carries out the decolorization process of textile fabrics at a pilot scale using an ozone-assisted process. 111 Powar et al. 111 decolorized 90% and above pigment-printed cellulosic textiles using the ozone-assisted process in an acidic solution.…”

“…111 Powar et al. 111 decolorized 90% and above pigment-printed cellulosic textiles using the ozone-assisted process in an acidic solution. He et al.…”