Modeling the deposition of fluorescent whitening agents on cotton fabrics

Laura Bueno, Carlos Amador, Serafim Bakalis

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)
120 Downloads (Pure)


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.
Original languageEnglish
Pages (from-to)1305-1316
JournalAIChE Journal
Issue number4
Early online date27 Oct 2017
Publication statusPublished - 1 Apr 2018


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