高等学校化学学报

高等学校化学学报 ›› 2001, Vol. 22 ›› Issue (S1): 240.

• 研究论文 • 上一篇    下一篇

吸附质大小对吸附树脂粒内扩散行为的影响(Ⅰ)——大孔聚苯乙烯型吸附树脂粒内扩散机制的考察

王春红, 施荣富, 温珍珍, 史作清, 何炳林   

  1. 吸附分离功能高分子材料国家重点实验室, 南开大学高分子化学研究所, 天津 300071
  • 收稿日期:2001-07-22 出版日期:2001-12-31 发布日期:2001-12-31
  • 通讯作者: 王春红(1971年出生),女,博士,讲师,从事功能高分子研究.Tel:022-23503935.

The Effect of Adsorbate Molecules on the Particle Diffusion of the Adsorption Resin(Ⅰ)

WANG Chun-Hong, Shi Rong-Fu, WEN Zhen-Zhen, Shi Zuo-Qing, HE Bing-Lin   

  1. The State Key Laboratory of Functional Polymeric Materials for Adsorption and Separation, Institute of Polymer Chemistry, Nankai University, Tianjin 300071, China
  • Received:2001-07-22 Online:2001-12-31 Published:2001-12-31

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摘要：

本文详细考察了大孔聚苯乙烯型吸附树脂对不同大小吸附质分子的吸附动力学行为,当吸附过程为粒扩散控制时,树脂孔径与分子尺寸的相对大小不仅决定了粒扩散速度的大小,也影响了粒扩散的控制机制.随着吸附质分子尺寸的增加,决定粒扩散速度的控速步骤也逐渐由表面扩散转向孔扩散。此外,还利用建立的扩散方程,测定了树脂吸附不间大小的吸附质时的粒扩散常数B和有效粒扩散系数De。

关键词: 吸附动力学, 粒扩散, 表面扩散, 孔扩散

Abstract:

The adsorption dynamics for the several adsorbate moleculars with different size of the macroporous adsorbent based on polystyrene was studied. When the adsorption rate was governed by the particle difTusioa process, it is considered that the ratio of the molecular size of adsorbates to the pore diameter not only influenced the adsorption rate, but also influenced the rate-determination step of particle diffusion. Increasing with the molecular weight of the adsorbates, the rate-determination step of particle diffusion transferred from surface diffusion to pore diffusion. At last, diffusion mass-transfer parameters were measured based on the related diffusion equations.

Key words: Adsorption Dynamics, Particle Diffusion, Surface Diffusion, Pore Dififusion

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