The adsorption of two widely used fluorescent whitening agents (FWAs) on unbrightened cotton fabrics has been investigated as a function of temperature, hardness of the wash liquor, initial concentration of FWA in solution, and fabric to wash liquor ratio. Sorption efficiencies of FWAs have been studied using a UV spectrophotometry technique. A mechanistic model has been developed to describe the dissolution process of FWAs, convective mass transport into the fabrics, diffusion in the stagnant layer to the fabrics' surface, and adsorption of FWAs on cotton fabrics. Dual porosity of the fabrics (inter-yarn and intra-yarn porosity) has been considered by allowing two different regions (outer and inner areas of the cotton fabrics) where FWAs molecules can diffuse and adsorb. Good agreement between experimental and predicted whiteness benefit by the proposed mathematical model has been observed for the range of variables considered. © 2017 American Institute of Chemical Engineers AIChE J, 2017

中文翻译：

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模拟荧光增白剂在棉织物上的沉积

已经研究了两种广泛使用的荧光增白剂（FWA）在未增亮的棉织物上的吸附随温度，洗涤液的硬度，溶液中FWA的初始浓度以及织物与洗涤液之比的变化关系。使用紫外分光光度法研究了FWA的吸附效率。已开发出一种力学模型来描述FWA的溶解过程，对流传质到织物中，在停滞层中扩散到织物表面以及FWA在棉织物上的吸附。通过允许FWA分子可以扩散和吸附的两个不同区域（棉织物的外部和内部区域），考虑了织物的双重孔隙率（纱线间和纱线内孔隙率）。对于所考虑的变量范围，已经观察到了所提出的数学模型在实验和预测的白度益处之间的良好一致性。©2017美国化学工程师学会AIChE的Ĵ，2017年