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›› 2009, Vol. 9 ›› Issue (1): 12-17.

• 反应与分离 • 上一篇    下一篇

球状壳聚糖树脂对柠檬酸的吸附行为

李海燕 汪东风 于丽娜 刘炳杰 张莉 徐莹   

  1. 中国海洋大学食品科学与工程学院 中国海洋大学食品科学与工程学院 中国海洋大学食品科学与工程学院
  • 收稿日期:2008-08-28 修回日期:2008-11-03 出版日期:2009-02-20 发布日期:2009-02-20
  • 通讯作者: 汪东风

Adsorption Behavior of Citric Acid on Resin of Chitosan Microspheres

LI Hai-yan WANG Dong-feng YU Li-na LIU Bing-jie ZHANG Li XU Ying   

  1. College of Food Science and Technology , Ocean University of China College of Food Science and Technology , Ocean University of China College of Food Science and Technology , Ocean University of China
  • Received:2008-08-28 Revised:2008-11-03 Online:2009-02-20 Published:2009-02-20
  • Contact: WANG Dong-feng

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摘要： 以壳聚糖为原料采用反相悬浮交联法制备了球状壳聚糖树脂(RCM)，通过静态吸附实验研究了RCM对柠檬酸的吸附热力学和动力学特性. 结果表明，吸附符合Laugmuir等温曲线，且平衡常数随着温度升高而升高；吸附是非自发熵增加的吸热过程；在相同的温度下，随着溶液中柠檬酸浓度的增加，吸附势逐渐降低；初始浓度相同时，随着温度的升高吸附势升高；在298, 308, 318 K下，RCM对柠檬酸的饱和吸附量分别为77.0, 80.5, 84.7 mg/g；吸附属二级动力学吸附，粒子内扩散是控速步骤，吸附速率常数随着温度升高而增加.

关键词: 球状壳聚糖树脂, 柠檬酸, 吸附, 热力学, 动力学

Abstract: The resin of chitosan microspheres (RCM) was prepared by using reverse phase suspension cross-linking polymerization. Static adsorption experiments were carried out to study the adsorption kinetics and thermodynamics of citric acid on RCM. The results indicated that the adsorption of citric acid followed the Langmuir isotherm. The Langmuir equilibrium constant (Kb) increased with increasing temperature. The adsorption was a non-spontaneous endothermic process of entropy increasing in thermodynamics of adsorption. The adsorption potential decreased gradually as citric acid concentration increased at the same temperature, and it increased as temperature increased at the same initial concentration of citric acid. The saturated adsorption capacities of citric acid on RCM were 77.0, 80.5 and 84.7 mg/g at 298, 308 and 318 K. The adsorption followed a second-order kinetic equation. The adsorption rate was controlled by the intraparticle diffusion, and the intraparticle diffusion rate constant (K) increased with increasing temperature.

Key words: resin of chitosan microspheres, citric acid, adsorption, kinetics, thermodynamics

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