An efficient ultrasonic and microwave assisted extraction of organic Henna dye for dyeing of synthetic polyester fabric for superior color strength properties

An energy efficient and 'green' extraction technique for extraction of organic Henna dye has been proposed for the dyeing of synthetic polyester fabric with high fastness and color strength propertiesto fulfill the world's highest demand towards energy efficient and 'green' processes and products and compared with conventional solvent extraction methods. The ultrasonic and microwave extraction methods were further analyzed and optimized in terms of extraction time and liquor ratio. To observe the effect of pH on the natural dyeing of polyester with Henna dye, dyeing were carried out at two different pH. Ultrasonic and microwave techniques noticeably extracted Henna dye with in less time than conventional solvent extraction method. High color strength and fastness properties were observed with ultrasonic and microwave extracted Henna dyeing of polyester fabrics.