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Study of adsorption kinetics for fluorescent whitening agent on fiber surfaces |
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| Authors: | XianNan Huang YanGui Huang XinSheng Chai and Wei Wei |
| Institution: | (1) College of Light Industrial and Food Engineering, Guangxi University, Nannning, 530004, China;(2) State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510640, China;(3) Institute of Paper Science and Technology, Georgia Institute of Technology, Atlanta, GA 30332, USA |
| Abstract: | Adsorption kinetics for a stilbene derivative type fluorescent whitening agent (FWA) on fiber surfaces was studied based on a real-time spectroscopic measurement system. Results showed that the time-dependent behavior of FWA agrees to that of a mono-molecular adsorption layer on fiber surfaces, as characterized in Langmuir-type expression. The adsorption has two distinguishable stages including initial fast phase with the primary constant of 1.51 × 1014 and the later near-equilibrium phase with the secondary constant of 4.96×10−4. The maximum amount of FWA adsorbed on fiber surfaces is 1.67×10−4g (per dry weight based fiber) in the initial phase. A mathematical model of adsorption kinetics was therefore established and evaluated. This model is important for the optimization of FWA application in papermaking. |
| Keywords: | fluorescent whitening agent (FWA) fibers adsorption kinetics |
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