离子交换树脂吸附L-色氨酸的动力学研究  

Study on the Kinetics of L-Tryptophan Adsorption by Ion Exchange Resin

作　　者：谢友坪[1] 敬科举[1] 姚传义[1] 卢英华[1] 

机构地区：[1]厦门大学化学化工学院化学工程与生物工程系,福建厦门361005

出　　处：《高校化学工程学报》2012年第4期710-715,共6页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(3107488);福建省自然科学基金(2011J01058);中央高校基本科研专项基金(2011121017)

摘　　要：通过静态吸附实验,研究了L-色氨酸在001×7型阳离子交换树脂上的等温吸附和吸附动力学特性。采用动边界模型描述L-色氨酸在该树脂上的交换行为,考察了料液浓度、树脂粒径和温度对交换过程的影响。结果表明,L-色氨酸在001×7型阳离子交换树脂上的吸附等温线符合Langmuir等温方程,且随pH降低,树脂的最大平衡吸附量逐渐增大;交换过程的吸附速率随L-色氨酸浓度和温度的升高而增大,但随树脂粒径的增大而减小;离子交换过程的速度控制步骤为颗粒扩散控制。交换过程的反应速率常数k0为1.199×10 5,反应级数为1.7,表观活化能Ea为19.94kJ mol 1,并得到了动力学总方程式。The isothermal adsorption and adsorption kinetics of L-tryptophan by 001 ×7 cation-exchange resin were studied by static experiments. The Moving Boundary Model was applied to describe the kinetics of the ion exchange process. The effects of experimental conditions including the concentration of L-tryptophan, resin particle diameter and adsorption temperature on the ion exchange process were investigated. The results show that the maximum L-tryptophan adsorption capacity of 001 ×7 cation-exchange resin increases with decreasing solution pH. It was found that the Langmuir equation fits the adsorption isotherm data best, and the particle diffusion is the rate-limiting step of the adsorption process. The adsorption ratio increases with the increase of L-tryptophan concentration and adsorption temperature, but decreases with the increase of the resin particle diameter. The rate constant of exchange （k0）, reaction order （a） and the apparent activation energy of reaction （Ea） were obtained as follows： ko= 1. 199 × 1 0-S, or= 1.7, E,= 19.94 kJ.mol-, and the kinetics equation was obtained too.

关 键 词：L-色氨酸 离子交换树脂 吸附 动力学 

分 类 号：O647.31[理学—物理化学]