Environmentally friendly dyeing of cotton in an ethanol–water mixture with excellent exhaustion,Green Chemistry

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Environmentally friendly dyeing of cotton in an ethanol–water mixture with excellent exhaustion
Green Chemistry ( IF 9.3 ) Pub Date : 2018-08-28 , DOI: 10.1039/c8gc01814f
Liangjun Xia _{1,

2,

3,

4,

5} , Aming Wang _{1,

2,

3,

4} , Chunhua Zhang _{1,

2,

3,

4} , Yang Liu _{1,

2,

3,

4} , Heng Guo _{2,

3,

4,

6} , Cailing Ding _{4,

7,

8,

9,

10} , Yunli Wang _{1,

2,

3,

4,

6} , Weilin Xu _{1,

2,

3,

4}

Affiliation

Conventional cotton dyeing methods rely on high salt concentrations and consume large amounts of water. To decrease the ecological impact of the textile industry, the development of a green and sustainable dyeing method for cotton fibres is essential. In the present work, ethanol was used to reduce the amounts of salt and water required for cotton dyeing. Cotton yarns were pretreated with alkali and then dyed with six reactive dyes in a 90 : 10 (v/v) ethanol–water mixture. Using various techniques, including transmission electron microscopy, the effects of ethanol on the particle size and zeta potential of the reactive dyes were examined in detail. Compared with conventionally dyed samples, the cotton yarns dyed in the ethanol–water system using the investigated reactive dyes exhibited enhanced exhaustion, total fixation, and colour strength in the absence of salt. Industrial-scale cotton bobbins produced using the developed method showed commercially acceptable levelness and reproducibility. This method affords a substantial reduction in eutrophication potential and wastewater effluent load, which would considerably improve the environmental cost of cotton dyeing processes. This eco-friendly dyeing process has considerable potential for application to a broad range of natural fibres.

中文翻译：

乙醇-水混合物中棉花的环境友好型染色，具有极佳的耗竭性

常规的棉花染色方法依赖于高盐浓度并消耗大量水。为了减少纺织工业的生态影响，开发一种绿色可持续的棉纤维染色方法至关重要。在目前的工作中，使用乙醇减少了棉花染色所需的盐和水量。棉纱用碱预处理，然后用六种活性染料在90:10（v / v）的乙醇-水混合物中染色。使用包括透射电子显微镜在内的各种技术，详细检查了乙醇对活性染料的粒径和ζ电势的影响。与常规染色样品相比，使用研究过的活性染料在乙醇-水系统中染色的棉纱显示出更强的耗竭性，总固色性，和无盐时的色强度。使用开发的方法生产的工业规模棉线轴显示出商业上可接受的匀度和可重复性。该方法可显着降低富营养化潜力和废水出水量，这将大大提高棉染工艺的环境成本。这种环保的染色工艺具有广泛的天然纤维应用潜力。

更新日期：2018-10-01

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