β-环糊精改性聚苯乙烯树脂吸附三硬脂酸甘油酯的研究

Study on Adsorption of Glyceryl Tristearate by β-Cyclodextrin Modified Polystyrene Resin

中文关键词:  纸机白水  树脂抽出物  β-环糊精  聚苯乙烯树脂  吸附

Key Words:paper machine white water  resin extractives  β-cyclodextrin  polystyrene resin  adsorption

中文摘要:

      采用β-环糊精改性聚苯乙烯树脂（PS-β-CD）吸附纸机白水中树脂抽出物的模型物三硬脂酸甘油酯，优化了吸附工艺，研究了三硬脂酸甘油酯在PS-β-CD上的等温吸附、吸附热力学和吸附动力学。结果表明，PS-β-CD对三硬脂酸甘油酯的优化吸附工艺为PS-β-CD用量2 g/L、吸附温度35 ℃（308 K）、吸附时间5 h、摇床转速240 r/min；Langmuir 和 Freundlich等温吸附模型均适用于描述PS-β-CD对三硬脂酸甘油酯的吸附，且该吸附过程为吸热的物理吸附；其吸附机理以颗粒内扩散为主。

Abstract:

      β-Cyclodextrin modified polystyrene resin （PS-β-CD） was used to adsorb glyceryl tristearate which was considered as the model of resin extractives in the paper machine white water. The adsorption condition was optimized； the isotherms， thermodynamics， and kinetics of the adsorption of glyceryl tristearate on PS-β-CD were investigated. The results showed that the optimized adsorption condition was PS-β-CD dosage of 2 g/L， temperature 35 ℃ （308 K）， time 5 h， and shaker speed 240 r/min. Both the Langmuir and Freundlich isothermal adsorption models are suitable for describing the adsorption process of glyceryl tristearate on PS-β-CD， which is a physical adsorption of endothermic process. In addition， the main adsorption mechanism is the intra-particle diffusion model.