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Abstract
Owing to their renewability and environmental friendly nature, natural dyes have been widely investigated in the textile sector over the past few decades. Natural dyeing technology, however, generally require toxic metal salt mordants to improve fastness and other functional properties; a large amount of mordants are unfixed and are discarded into wastewaters which represent dramatic environmental problems. The present work represents a cleaner production strategy by reusing wastewater of henna dyebath for the development of functional and coloured linen fabrics. The reuse of dyeing liquor was done in a systematic way and the dyed linen was characterized by several spectroscopic techniques. The analysed colour measurements, UV protection, and antioxidant property of dyed linen were very good. The obtained data in terms of chemical oxygen demand, TDS, conductivity, redox potential and pH of the bath showed that almost zero percentage of mordant salt remains in exhaust bath after three successive dyeing.
Published Version
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