Nitrogen-mediated dyeing of denim with natural indigo: Towards sustainable and efficient coloration

IF 4.1 3区工程技术 Q2 CHEMISTRY, APPLIED

Dyes and Pigments Pub Date : 2025-03-22 DOI:10.1016/j.dyepig.2025.112778

Kangkang Wang, Qingliang Luo, Wei Ding, Qiangqiang Zhang, Dongxiao Ji, Rongwu Wang, Xiaohong Qin

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引用次数: 0

Abstract

The conventional indigo dyeing process for denim production poses significant environmental challenges. While natural indigo dyes offer eco-friendly alternatives, their application is limited by low dye uptake and poor color fastness. This study integrates molecular dynamics simulations and experimental approaches to explore the effects of nitrogen (N₂) protected dyeing technology on natural indigo performance. Results reveal that N₂ protection enhances the hydrogen bonding in cellulose fibers, strengthens dye-fiber interactions, and improves dye diffusion, leading to superior dyeing outcomes. Using response surface methodology (RSM), we identified N₂ concentration and dyeing temperature as key factors influencing coloration efficiency and fastness. Under optimized conditions, natural indigo achieved performance comparable to synthetic dyes while exhibiting enhanced biodegradability in residual dye baths. Compared to conventional synthetic indigo dyeing processes, the N₂-assisted natural indigo dyeing strategy achieves a 41.45 % reduction in chemical consumption, and 28.72 % decrease in energy consumption and CO₂ emissions. These results validate its dual advantages in enhancing dye utilization efficiency and ecological sustainability. This work provides a theoretical foundation for sustainable denim dyeing and advances eco-conscious practices in textile industry, offering both scientific and practical insights.

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来源期刊

Dyes and Pigments 工程技术-材料科学：纺织

CiteScore

8.20

自引率

13.30%

发文量

933

审稿时长

33 days

期刊介绍： Dyes and Pigments covers the scientific and technical aspects of the chemistry and physics of dyes, pigments and their intermediates. Emphasis is placed on the properties of the colouring matters themselves rather than on their applications or the system in which they may be applied. Thus the journal accepts research and review papers on the synthesis of dyes, pigments and intermediates, their physical or chemical properties, e.g. spectroscopic, surface, solution or solid state characteristics, the physical aspects of their preparation, e.g. precipitation, nucleation and growth, crystal formation, liquid crystalline characteristics, their photochemical, ecological or biological properties and the relationship between colour and chemical constitution. However, papers are considered which deal with the more fundamental aspects of colourant application and of the interactions of colourants with substrates or media. The journal will interest a wide variety of workers in a range of disciplines whose work involves dyes, pigments and their intermediates, and provides a platform for investigators with common interests but diverse fields of activity such as cosmetics, reprographics, dye and pigment synthesis, medical research, polymers, etc.