Ultrasonic assisted sustainable dyeing of mordanted silk fabric using arjun (Terminalia arjuna) bark extracts

Environmental pollution spread due to frequent use of synthetic dyes has compelled the global community to move toward sustainable and eco-friendly products. The present research has been conducted to investigate the coloring efficacy of Arjun bark (Terminalia arjuna) for silk fabric under the influence of ultrasonic radiation. Extracts have been prepared in different media and extracts and silk fabrics have been irradiated ultrasonically for 15-60 min at 60 degrees C. Good color strength is obtained, by dyeing irradiated silk for 65 min at 65 degrees C, when irradiated extract of pH 3 (RE, 30 mL) obtained from powder (6 g) is used in the presence of salt concentration of 3 g/100 mL. Pre-chemical mordants such as 5% of Al (Aluminum sulphate) and 9% of Fe (iron sulphate) as well as post-chemical mordants such as 5% Al (Aluminum sulphate) and 3% of Fe (iron sulphate) have improved the color characteristics. The bio-mordants employed reveal that 9% of pomegranate and turmeric extracts as pre and post bio-mordants have given excellent coloring characteristics. It is concluded that Arjun bark has a great potential to act as a source of natural colorant for silk dyeing under the influence of ultrasonic radiation. (c) 2018 American Institute of Chemical Engineers Environ Prog, 38: S331-S339, 2019