Colour fading is a method that is used to achieve a vintage look in textile goods. It is desired by customers in the textile market. Additionally, customers demand that these types of products are produced by environmentally friendly methods. In this study, sodium hypochlorite and ozone were used as laboratory-scale colour fading reagents on dyed cotton fabrics. Cotton fabrics were dyed with four different primary colours: red, yellow, blue and black. Dyed fabrics were subjected to ozone and sodium hypochlorite treatment under different treatment conditions. Ozone was chosen as an alternative for comparison and it was applied at fixed flow rate (5 L/min) and time (10 minutes). Colour differences, chemical oxygen demand, bursting strength and energy, water and chemical consumptions were measured. The surface morphology was characterised by scanning electron microscopy. We can conclude that ozonation is effective in discharging colour from dyed fabric samples, and the colour-fading effect is uniform, like in sodium hypochlorite treatment. It was observed that both processes are similar in terms of strength and surface modification. Results showed a 90% cost reduction, 85% water conservation and a 26% chemical oxygen demand reduction.

中文翻译：

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次氯酸钠和臭氧处理的褪色效果比较

褪色是一种用于在纺织品中实现复古外观的方法。是纺织市场的客户所需要的。此外，客户要求这些类型的产品采用环保方法生产。在这项研究中，次氯酸钠和臭氧被用作染色棉织物的实验室规模褪色剂。棉织物用四种不同的原色染色：红色、黄色、蓝色和黑色。染色织物在不同处理条件下进行臭氧和次氯酸钠处理。选择臭氧作为比较的替代方案，并以固定流速 (5 L/min) 和时间 (10 分钟) 应用。测量了颜色差异、化学需氧量、爆破强度和能量、水和化学品消耗量。通过扫描电子显微镜表征表面形态。我们可以得出结论，臭氧对染色织物样品的脱色是有效的，并且褪色效果是均匀的，就像在次氯酸钠处理中一样。据观察，这两种工艺在强度和表面改性方面是相似的。结果表明，成本降低了 90%，节水率降低了 85%，化学需氧量降低了 26%。