We report an analytical approach to study dye desorption and transfer processes in aqueous environment. The study was conducted simulating standard laundry washes using two different donor textiles, a polyester textile dyed with Disperse Blue 79 and a cotton textile dyed with Reactive Red 239, and two acceptor textiles, undyed cotton and polyester, respectively. Dye bleeding/solubilization from a donor textile to the solution was investigated through UV–visible absorbance analysis, while the dye absorption onto acceptor textile was quantified by UV–visible reflectance analysis. Dye desorption and transfer processes were investigated in water and surfactant solutions at different concentrations. A desorption and transfer model for the two classes of dyes was hypothesized by performing kinetic experiments. The results show that both processes depend on the presence of surfactants for the disperse dye. Conversely, the presence of surfactants has little effect on the reactive dye. Finally, the presence of an acceptor polyester significantly increases the bleeding of the disperse dye, while the presence of an acceptor textiles less influences the total release of the reactive dye.

中文翻译：

---

不同类别染料的解吸和转移过程

我们报告了一种研究水性环境中染料解吸和转移过程的分析方法。该研究使用两种不同的供体纺织品模拟标准洗衣洗涤，一种用分散蓝 79 染色的聚酯纺织品和一种用活性红 239 染色的棉纺织品，以及两种受体纺织品，分别为未染色的棉和聚酯。通过紫外-可见光吸收分析研究染料从供体纺织品到溶液的渗色/增溶，而受体纺织品上的染料吸收通过紫外-可见光反射率分析进行量化。在不同浓度的水和表面活性剂溶液中研究了染料解吸和转移过程。通过进行动力学实验假设了两类染料的解吸和转移模型。结果表明，这两个过程都取决于分散染料表面活性剂的存在。相反，表面活性剂的存在对活性染料影响不大。最后，受体聚酯的存在显着增加了分散染料的渗色，而受体纺织品的存在对活性染料的总释放影响较小。