Abstract
The use of synthetic dyes causes environmental pollution as majority of these dyes are toxic and non-biodegradable. Natural dyes on the other hand have proved to be eco-friendly, biodegra- dable and highly compatible with the environ-ment. Consequently, dyes derived from natural sources have emerged as important alternatives to synthetic dyes. In the present work, the major color component isolated from the pods of G. sepium plant is morin, which is a flavonoid moiety. The dyeing behaviour of this component on silk yarn was investigated. Mordanting stu- dies have indicated that the post-mordanting method was found to be a better method com-pared to pre-mordanting. Variation of pH on dye extract pointed out that the maximum absorbance was at pH 4 and hence all the dyeing studies have been carried out at that pH. Thermodynamic parameters were determined by studying the dyeing process at different temperatures. Heat of dyeing was positive which indicated the dyeing process was endothermic. The adsorption process of morin on silk was tested with Langmuir, Freundlich and Tempkin- Pyzhev isotherm models. The adsorption process followed both the Langmuir and Freund- lich isotherms. The value of regression coefficient, however, indicated that the Langmuir isotherm was a better fit than the Freundlich isotherm. These results signified that the adsor- ption of morin on silk yarn was homogeneous in nature with the formation of a monolayer. Hence, the dye obtained from the pods of G. sepium plant may be an alternative source to synthetic dye for the dyeing of silk as well as other textile fabrics.
Highlights
The use of synthetic dyes causes environmental pollution as majority of these dyes are toxic and non-biodegradable
G. sepium, is an important member of the family Fabaceae, which is widely naturalized in the tropical Americas, Caribbean, Africa, Asia, and the Pacific Islands
The present research was performed with the following objectives: 1) To extract and isolate the main color component from the pods of G. sepium plant, 2) To explore the dyeing properties of the color component on silk, 3) To study adsorption isotherms of the color component on silk and 4) To evaluate the thermodynamic parameters of the dyeing process through kinetic studies
Summary
The use of synthetic dyes causes environmental pollution as majority of these dyes are toxic and non-biodegradable For this reason, there is a revival of interest in the non-toxic and eco-friendly natural dyes. G. sepium, is an important member of the family Fabaceae, which is widely naturalized in the tropical Americas, Caribbean, Africa, Asia, and the Pacific Islands. Since this tree possesses high nitrogen-fixing properties and the leaves can be used for mulch and green manure, which makes it highly suitable in agroforestry systems. The present research was performed with the following objectives: 1) To extract and isolate the main color component from the pods of G. sepium plant, 2) To explore the dyeing properties of the color component on silk, 3) To study adsorption isotherms of the color component on silk and 4) To evaluate the thermodynamic parameters of the dyeing process through kinetic studies
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