Bark Residues Recovery of Juglans Regia. L For the Dyeing of Wool Fabrics : Development of Microwave-assisted Extraction and Dyeing Processes

ABSTRACT

Large quantities of plant waste are rejected daily in our universe. Consequently, several researchers have proposed various ways to enhance them. One of these possible routes is recovery as a natural dye for textile use. This study aims to explore the possibility of recovering the Juglans Regia. L barks residues in natural dyeing. Hence, the extraction of a bio-dye was carried out by microwave, several parameters were studied, namely: the microwave power, the pH, and the duration. The total phenolic compounds, flavonoids, condensed and hydrolyzable tannins contents were estimated each time. Then, the colored extracts were used for dyeing wool fabrics. The Dyeing quality resulted was estimated by calculating the colorimetric coordinates (L*, a*, b*) and the color strength (K/S). Good results were obtained, with brown shades and a color strength (K/S) close to 15 was reached. The dyeing fastnesses were also checked, acceptable fastnesses to washing, rubbing and to light were obtained. Finally, the dyed and undyed wool samples were characterized by spectral Infrared analysis and a proposal of possible dyeing mechanisms was suggested.

摘要

在我们的宇宙中，每天都有大量的植物废料被丢弃. 因此，一些研究人员提出了各种方法来增强它们. 其中一个可能的途径是作为纺织用天然染料进行回收. 本研究旨在探讨恢复核桃的可能性. 天然染色的残余物. 为此，采用微波萃取法对一种生物染料进行了提取，研究了微波功率、pH值和提取时间对提取效果的影响. 每次测定总酚类化合物、黄酮类化合物、缩合单宁和水解单宁含量. 然后，将有色提取物用于羊毛织物的染色. 通过计算比色坐标（L*、a*、b*）和染色强度（K/S）来评价染色质量. 获得了良好的结果，颜色为棕色，颜色强度（K/S）接近15. 并对染色牢度进行了检验，得到了可接受的水洗牢度、摩擦牢度和耐光牢度. 最后，通过红外光谱分析对染色和未染色羊毛样品进行了表征，并提出了可能的染色机理.

KEYWORDS:

• Juglan Regia barks residues
• valorization
• microwave extraction
• natural dye
• dyeing mechanism
• phenolic compounds content

关键词:

• 核桃皮渣
• 缬草化
• 微波萃取
• 天然染料
• 染色机理
• 酚类化合物含量

Acknowledgments

The authors would like to acknowledge the support offered by Taif University Researchers Supporting Project number (TURSP-2020/188), Taif University, Taif, Saudi Arabia. The authors would like to thank also the Tunisian Higher Education and Scientific Research Ministry.

Declaration of interests

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.