Sustainable extraction and dyeing of microwave-treated silk fabric using arjun bark colorant

ABSTRACT

Due to an increase in awareness of harmful aspects of synthetic dyes among the global community, the demand of natural dyes in textile sector has been dramatically increased. The current study has been conducted to explore new eco-friendly source of natural brown colorant from arjun bark for textile. Both bark powder and silk fabrics were microwave irradiated for 1–6 min. Dyeing was performed at different variables onto irradiated and un-irradiated silk using extracts obtained from irradiated and un-irradiated powder. To make the dyeing process more sustainable, two chemical and bio-mordants were employed at optimal conditions. The results show that acidified methanolic extract from irradiated powder (RP, 8g) has given high color strength if irradiated silk (RSi) is dyed for 65 min. at 65°C using dye bath of 1 pH in presence of 7% of Na₂SO₄ as exhausting agent. Good shades and improved fastness characteristics have been obtained by employing 1% of Fe (iron sulfate) and Al (aluminum sulfate) as Chemical and 1% of turmeric and pomegranate extracts as bio-mordants. Hence, microwave radiation has not only explored the coloring efficacy of arjun bark as potential source of natural brown dye but also made its applicability under sustainable conditions.

摘要

由于国际社会对合成染料的有害方面认识的提高，纺织部门对天然染料的需求急剧增加。本研究旨在从Arjun树皮中寻找新的生态友好的天然棕色着色剂来源。将树皮粉和真丝织物微波辐射1-6分钟。用辐照和未辐照的蚕丝粉提取液对辐照和未辐照的蚕丝进行不同变量的染色。为了使染色过程更可持续，在最佳条件下使用了两种化学和生物媒染剂。结果表明，辐照蚕丝（RSi）在65℃下，在7%Na2SO4存在下，用1pH的染料浴在65℃下染色65分钟，辐照蚕丝（RP，8g）的酸化甲醇提取物具有较高的着色强度。采用1%的Fe（硫酸铁）和Al（硫酸铝）作为化学药剂，1%的姜黄和石榴提取物作为生物媒染剂，得到了良好的色调和改善的牢度特性。因此，微波辐射不仅探索了Arjun树皮作为天然棕色染料的潜在着色源，而且使其在可持续条件下的适用性。

KEYWORDS:

• Arjun
• Bio-mordant
• chemical mordant
• microwave radiation
• silk
• sustainability

关键词:

• 生物媒染剂
• 化学媒染剂
• 微波辐射
• 丝绸
• 持续性

Acknowledgments

Authors are thankful to Mr. Muhammad Abbas, Director Harris Dyes and Chemicals, Faisalabad, Pakistan and Mr. Zafar Iqbal, Manager Noor Fatima Fabrics Faisalabad, Pakistan for providing us the technical assistance in conducting the part of PhD studies at industrial Lab level. We are also thankful to PHOSAGRO/UNESCO/IUPAC GRANTS in GREEN CHEMISTRY for funding through a project (PHOSAGRO/UNESCO/IUPAC/GCUF. No. 128).

Additional information

Funding

This work was supported by the PHOSAGRO/UNESCO/IUPAC grants in green chemistry vide project no. PHOSAGRO/UNESCO/IUPAC/GCUF. NO.128.