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采用实时检测光谱技术对二苯乙烯类荧光增白剂(FWA)在纸浆纤维表面的吸附动力学进行了研究.根据实验数据,导出了描述FWA在纤维表面的吸附行为的动力学模型.结果表明,二苯乙烯型荧光增白剂在纸浆纤维表面的吸附符合Langmuir单分子层吸附的规律.其吸附过程分为初期的快速吸附(吸附系数为1.51×1014)和后期的准平衡态慢速吸附(吸附系数为4.96×10?4)两个阶段.准平衡态的最大吸附量为1.67×10?4g(FWA)/g(绝干浆).所建立的动力学数学模型将对荧光增白剂在造纸湿部的添加方式和地点的选择以及控制等具有重要的指导意义.
Adsorption kinetics of stilbene optical brightener (FWA) on the surface of pulp fiber was studied by using real-time detection spectroscopy. According to the experimental data, a kinetic model describing the adsorption behavior of FWA on fiber surface was derived. , The absorption of stilbene-type optical brightener on the surface of pulp fiber accords with the law of Langmuir monolayer adsorption.The adsorption process is divided into the initial rapid adsorption (adsorption coefficient 1.51 × 1014) and the late quasi-equilibrium slow adsorption (Adsorption coefficient of 4.96 × 10 4) .The maximum adsorption capacity of quasi-equilibrium state is 1.67 × 10 4 g (FWA) / g (absolute dry pulp). The kinetic mathematical model established will enhance the fluorescence whitening Agent in the wet end of the paper to add the way and place of choice and control has important guiding significance.