| Issue |
E3S Web Conf.
Volume 648, 2025
International Conference on Civil, Environmental and Applied Sciences (ICCEAS 2025)
|
|
|---|---|---|
| Article Number | 03015 | |
| Number of page(s) | 6 | |
| Section | Applied Sciences | |
| DOI | https://doi.org/10.1051/e3sconf/202564803015 | |
| Published online | 08 September 2025 | |
Mordant-Free Dyeing of Organic Cotton Using Tea Extracts: Waste-to-Color
1 State Key Laboratory of New Textile Materials and Advanced Processing Technologies, Wuhan Textile University, Wuhan 430200, China.
2 Department of Chemistry, Faculty of Science, University of Chittagong, Chittagong 4331, People’s Republic of Bangladesh.
3 Ivory V. Nelson Center for the Sciences, Department of Chemistry and Physics, Lincoln University, 1570 Baltimore Pike, Pennsylvania 19352, The United States of America.
* Corresponding authors: K. Wei (wke@wtu.edu.cn) and S. Mahmud (smahmud@lincoln.edu)
The valorization of green tea waste as a sustainable natural dye for organic cotton fabrics offers a promising alternative to synthetic dyes, mitigating environmental and health risks. We developed a mordant-free, ultrasonic-assisted dyeing protocol that maximizes dye uptake and fastness while minimizing energy consumption. Systematic optimization revealed 55 °C as the ideal dyeing temperature, achieving superior color strength (K/S = 1.445) and excellent wash and rub fastness without compromising fiber integrity. Mechanistic insights from physicochemical analyses demonstrated enhanced polyphenol–cellulose interactions facilitated by ultrasonic cavitation. This eco-friendly approach promotes circular bioresource utilization and advances green textile coloration.
Key words: Mordant-free dyeing / Organic cotton / Waste-to-Color / Green tea dyes / Ultrasonic-assisted dyeing
© The Authors, published by EDP Sciences, 2025
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