离子交换吸附L-瓜氨酸的热力学和动力学  

Thermodynamics and kinetics of L-citrulline adsorption by ion exchange

作　　者：丁叶[1] 郝宁[1] 

机构地区：[1]南京工业大学生物与制药工程学院,江苏南京211800

出　　处：《生物加工过程》2017年第3期25-28,35,共5页Chinese Journal of Bioprocess Engineering

基　　金：国家自然科学基金(201406113);江苏省自然科学基金(BK20140932)

摘　　要：研究不同树脂对L-瓜氨酸的吸附能力,发现D001树脂对L-瓜氨酸的吸附效果最好。采用静态吸附法研究L-瓜氨酸在D001型阳离子交换树脂上的热力学和动力学特性,考察不同温度、pH和溶液初始浓度对离子交换过程的影响。结果表明:L-瓜氨酸在D001型阳离子交换树脂上的吸附等温线符合Freundlich和Langmuir等温吸附方程,其中,Langmuir吸附方程能更好地描述该过程。吸附过程焓变ΔH=-45.01 k J/mol(<0),说明该吸附过程放热。树脂对L-瓜氨酸的吸附过程速度控制步骤为颗粒扩散。随着温度升高,树脂的最大平衡吸附量减小;当pH=6时,树脂达到最大吸附量135.5 mg/g;L-瓜氨酸溶液初始质量浓度为8 g/L时,扩散系数达到最大,为8.53×10-3,吸附速率最快。We studied the adsorption of different resins for L- citrulline,and found that D 001 resin adsorbed L-citrulline best. Then w e further studied the thermodynamics and kinetics of L-citrulline adsorption on D 001 by static adsorption and the effects of temperature,p H and solution initial concentration on the ion exchange process.In a certain range of concentration, L-citrulline on D 001 agreed with Freundlich adsorption isotherm and Langmuir isotherm equation. However,Langmuir isotherm equation can describe the adsorption process better.The process of adsorption enthalpy of AH =-45. 01 kJ/mol（〈0） indicated that the adsorption process is an exothermic reaction. Particle diffusion in the adsorption of L-citrulline is the rate controlling step.The maxim u m equilibrium adsorption capacity of the resin decreased with the increase of temperature.When pH was at 6,the maximum adsorption was reached at 135. 5 mg/g.When L-citrulline solution initial concentration was 8 g/L ,the diffusion coefficient reached the maximum value of 8. 53x 10 3 and the adsorption rate was fastest.

关 键 词：L-瓜氨酸 离子交换树脂 Corynebacterium glutamicum 动力学 热力学 

分 类 号：O647.31[理学—物理化学]