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- Title
Dyeing of Cotton with Indigo Using Alkaline Protease and Additives.
- Authors
Mazumdar, Pranav; Chakraborty, J. N.
- Abstract
Indigo is invariably applied on cotton to produce an attractive blue shade, together with the desired wash-down eff ects. Because it is water insoluble, indigo is reduced and solubilised with sodium dithionite and NaOH to develop affinity for cotton. Sodium dithionite dissociates into hazardous by-products viz. sulphate, sulphite and thiosulphate with a harmful eff ect on the environment due to their toxicity, as well as a corrosive eff ect on waste lines. To overcome these problems, the eco-friendliness of alkaline protease, together with iron (II) sulphate (FeSO4) as a reducing agent, was studied as a replacement for sodium dithionite. Dyed samples were characterised by attenuated total reflection, using Fourier transformation infrared spectroscopy, scanning electron microscope and X-ray diff raction (XRD). It was observed that alkaline protease, together with iron (II) sulphate, is also capable of producing a comparable reduction potential in dye baths, reduction bath stability, and the surface colour strength and colour fastness properties of dyed cotton compared to those obtained using sodium dithionite.
- Subjects
ALKALINE protease; ATTENUATED total reflectance; SODIUM dithionite; SCANNING electron microscopes; FOURIER transforms
- Publication
Tekstilec, 2019, Vol 62, Issue 3, p187
- ISSN
0351-3386
- Publication type
Article
- DOI
10.14502/Tekstilec2019.62.187-199