摘要
采用静态吸附法研究离子强度对牛磺酸/OH-体系在阴离子树脂D290上离子交换平衡的影响,测定了不同离子强度下牛磺酸在碱式阴离子交换树脂上的交换平衡等温线.研究结果表明:(1)随着溶液离子强度的升高,阴离子树脂对牛磺酸的平衡交换吸附容量逐渐降低,牛磺酸在树脂上的分配系数λTau逐渐下降;(2)随着溶液离子强度增大,达到平衡时液相的pH值升高,溶液中牛磺酸阴离子Tau±含量迅速增加,而牛磺酸两性离子Tau±含量迅速降低;(3)在一定的牛磺酸浓度范围内,溶液离子强度增大,有利于提高离子交换树脂对牛磺酸的选择性.
In this paper, the effects of ionic strength of solution on the ion-exchange equilibria of taurine/OH^- system on anion exchange resin D290 were investigated by means of static adsorption, and the equilibrium uptake isotherms of taurine on the alkali anion exchange resin were measured at different ionic strengths. The results show that, with the increase in ionic strength, the adsorbed amount of taurine on the resin D290, the distribution coefficient λTau and the fraction of zwitterion Tau^± all decrease, while the pH value of the solution at the equilibrium and the content of anionic taurine Tau^- increase. Moreover, it is found that, at a certain taurine concentration, the increase in ionic strength may improve the selectivity of the anion resin for taurine.
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2007年第7期57-61,共5页
Journal of South China University of Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(20336020)
关键词
离子交换
牛磺酸
离子强度
氨基酸
相平衡
ion exchange
taurine
ionic strength
amino acid
phase equilibrium
