Ozonation is increasingly being used and reported in recent years. This paper investigates ozonation on aqueous reactive dyes and their dyed cotton comparatively. The effects, including pH, temperature and initial dye concentration (for aqueous dyes)/water pick-up (for dyed cotton), on Reactive Blue FL-RN, Reactive Red FL-2BL and Reactive Yellow FL-2RN, were studied via Fourier Transform–infrared spectroscopy, ultraviolet-visible absorption and k/s curves. The kinetic results indicated that all the aqueous dyes were of pseudo-first order kinetics, while dyed cotton represented pseudo-secondary or pseudo-third order kinetics. Based on their different mechanisms, there was a dramatic gap between dyes and dyed cotton in ozonation performance. The curve of rate constant vs pH of dye ozonation exhibited a U-shape with the minimum value at pH 7, but for dyed cotton ozonation, the curve showed a Λ-shape optimised at pH 10. Also, high temperature resulted in hydrolysis of dyes in aqueous solution, whereas this was not applicable to dyed cotton. The effect of pick-up (0%-150% with an interval of 75%) on reactive-dyed cotton was greater than the effect of initial dye concentration (which varied from 120 to 40 mg/L) on the colour yield of aqueous reactive dyes.

中文翻译：

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水性活性染料与活性染色棉的臭氧化对比研究

近年来，臭氧化越来越多地被使用和报道。本文比较研究了水性活性染料及其染色棉的臭氧化作用。通过傅立叶对活性蓝 FL-RN、活性红 FL-2BL 和活性黄 FL-2RN 的影响，包括 pH、温度和初始染料浓度（水性染料）/吸水率（染色棉）变换红外光谱、紫外可见吸收和k/s曲线。动力学结果表明，所有水性染料均为拟一级动力学，染色棉为拟二级或拟三级动力学。基于它们不同的机理，染料与染色棉在臭氧化性能上存在巨大差距。染料臭氧化速率常数与 pH 值的关系曲线呈 U 形，在 pH 7 时具有最小值，但对于染色棉臭氧化，曲线在 pH 10 时呈现出优化的 Λ 形。此外，高温导致染料水解在水溶液中，而这不适用于染色棉。活性染色棉的上染率（0%-150%，间隔75%）的影响大于初始染料浓度（120~40 mg/L）对水性染色产色量的影响。活性染料。