A New Approach to Eco-friendly Dyeing of Cotton Fabric with Vat Dyes Using Plant Extract as Natural Reducing Agents

Document Type : Original Article

Authors

1 Department of Wet Process Engineering, Bangladesh University of Textiles, P.O. Box: 1208, Tejgaon, Dhaka, Bangladesh

2 Department of Chemical Engineering, RMIT University, 124 La Trobe St, Melbourne, Australia

Abstract

Vat dyes are one of the most popular dye classes producing brilliant hues on cellulose, viscose, and linen fabrics. Conventional vat dyes, to be converted into water-soluble leuco form, involve reduction with sodium dithionite which produces lots of harmful and non-renewable bi-products that causes environmental pollution. In this research work, apple, henna root, cabbage stem and amaranthus root have been used as organic reducing agents and compared with sodium dithionite in vat dyeing on cotton fabrics. Fruit extract (apple) and three plant extracts can pave a new way in the reduction process of vat dyes. Here reduction potential of reducing agents has been measured using a potentiometer coupled with photometric study and FTIR analysis has also been determined prior dyeing. The concentrations of reducing agents were noted to reach the required reduction potential which needs to be more negative than the range of -700 to -850 mV (vs. Ag/AgCl, 3M KCl) for reducing vat dye. The color strength of the dyed samples was analyzed by a Reflective Spectrophotometer and several colorfastness tests were also performed. The results show that using natural reducing agents in the reduction of vat dye can be appreciated because test results are closer to reduction with sodium dithionite. Furthermore, with introducing these substances, the production of hazardous chemicals is minimized and vat dyeing can be environmentally friendly.

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References

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Progress in Color, Colorants and Coatings
Volume 16, Issue 1
February 2023
Pages 83-96

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