MATEC Web Conf.
Volume 108, 20172017 International Conference on Mechanical, Aeronautical and Automotive Engineering (ICMAA 2017)
|Number of page(s)
|Textile Industry and Technology
|31 May 2017
Comparison of sodium dithionite and glucose as a reducing agent for natural indigo dyeing on cotton fabrics
1 Department of Chemistry, Faculty of Science, Kasetsart University, Bangkok 10900 Thailand
2 Department of Textile Science, Faculty of Agro-Industry, Kasetsart University, Bangkok 10900 Thailand
A traditional reducing agent in an indigo dyeing process with cotton fabrics is sodium dithionite (Na2S2O4) which is environmentally unfavorable because the resulting by-products cause various problems to the disposal wastewaters. In this research, glucose was used as a possible replacement of Na2S2O4 in indigo dyeing. The comparison of reduction power of Na2S2O4 and glucose for natural indigo dyeing on cotton fabrics based on reduction potential was analyzed. The optimum reduction temperature for natural indigo dye of both reducing agents was at 70°C. The reduction time did not have a significant effect on the reduction potential under the condition studied. Na2S2O4 could give higher color strength than glucose. However, wash fastness of the fabric samples from a glucose reduction was slightly better than Na2S2O4 ones. Hence, glucose virtually has a potential to be used as a green reducing agent in natural indigo dyeing.
© The Authors, published by EDP Sciences, 2017
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