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首页> 外文期刊>ACS Omega >Nanocellulose-Based Sustainable Dyeing of Cotton Textiles with Minimized Water Pollution
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Nanocellulose-Based Sustainable Dyeing of Cotton Textiles with Minimized Water Pollution

机译：基于纳米纤维素的可持续染色棉纺织品，最小化水污染

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This research aims at minimizing environmental pollution by effluents discharged from current textile dyeing processes. The reduction of pollution is approached with a nanofibrillated cellulose (NFC) dyeing method. In the commonly used exhaust reactive dye bath cotton dyeing process, water effluents are contaminated with unreacted dyes and dyeing formulation auxiliaries amid the consumption of 20 weight units of water per weight unit of colored textile products. It was recently demonstrated that using reactive dye-colored NFC hydrogels—an aqueous dispersion of the NFC pigment—a sustainable dye carrier—results in 6-fold reduction in consumption of water and auxiliaries. Here, we report further developments of this technology. Cotton fabrics and NFC hydrogels inherit a fraction of soluble polysugars that react and conjugate with the reactive dyes. These soluble dye-conjugated polysugars are released into the wastewater, thus resulting in water pollution and also in reduced efficiency of the dyeing process. We demonstrate here that post-treatment of NFC-colored cotton textiles with polycarboxylic acid secures permanent chemical grafting of the soluble dye-labeled polysugars and forms chemical cross-links with the NFC fibers on the cotton fabric via the esterification reaction. This combination leads to the improvement of dye fixation by 30% and reduces the dye discharge in the washing stage by 60%. This enhancement is approached without compromising the stiffness and breathability of the fabrics. The advanced textile method is tested for a series of reactive dyes covering the entire visual spectrum range.
机译：本研究旨在通过从当前纺织染色过程中排出的污水最小化环境污染。用纳米纤化纤维素（NFC）染色方法接近污染的减少。在常用的废气反应性染料浴棉染色过程中，水流污染有未反应的染料和染色配方助剂，在每重量单位的彩色纺织产品的20重量单位的水中消耗。最近据证明，使用反应性染料NFC水凝胶 - NFC颜料的水分散体 - 一种可持续染料载体 - 降低水和助剂的8倍。在这里，我们报告了这项技术的进一步发展。棉织物和NFC水凝胶继承了与反应性染料反应和缀合物反应和缀合物的一小部分。将这些可溶性染料缀合的多晶石释放到废水中，从而导致水污染，也降低了染色过程的效率。我们在此证明，具有多元羧酸的NFC色棉纺织品的后处理确保了可溶性染料标记的多晶石的永久化学嫁接，并通过酯化反应在棉织物上与NFC纤维形成化学交联。该组合导致染料固定的改善30％，并将洗涤阶段的染料排放减少60％。接近这种增强，而不会影响织物的刚度和透气性。对覆盖整个视觉谱系列的一系列反应性染料测试了先进的纺织方法。

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