Study of adsorption kinetics for fluorescent whitening agent on fiber surfaces

• 来源期刊: 中国科学B辑（英文版）
• 年，卷（期）: 2008,（5）
• 页码范围: 473-478
• 页数: 6页
• 语种: 英文
• DOI: 10.1007/s11426-008-0013-8

摘要

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 include-ing 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 applica-tion in papermaking.