物理化学学报 >> 1997, Vol. 13 >> Issue (03): 224-229.doi: 10.3866/PKU.WHXB19970308

研究论文 上一篇    下一篇

Na型斜发沸石上Na+-Cu2+离子交换过程动力学

李曼尼,杨文斌,新民   

  1. 内蒙古大学化学系,呼和浩特 010021
  • 收稿日期:1996-07-04 修回日期:1996-11-19 发布日期:1997-03-15
  • 通讯作者: 李曼尼

Kinetics of the Na+-Cu2+ Ion Exchange on the Na-form Clinoptilolite

Li Man-Ni,Yang Wen-Bin,Xin Min   

  1. Department of Chemitstry,Inner Mongolia University,Hohhot 010021
  • Received:1996-07-04 Revised:1996-11-19 Published:1997-03-15
  • Contact: Li Man-Ni

摘要:

用静态离子交换法研究了Na型斜发佛石上2Na+=Cu2+离子交换动力学,分别测定了液膜扩散常数R、粒内扩散系数D和滞留时间τd. 实验发现,离子交换起始为液膜扩散控制,随后在交换的大部分时间内为粒内扩散控制.并就温度、浓度对离子交换过程速率、Cu2+平衡交换数量以及滞留时间的影响进行了讨论.

关键词: 离子交换动力学, 钠型斜发沸石

Abstract:

The Na+-Cu2+ ion exchange on the Na-form clinoptilolite was studied by the batch reaction method. The film diffusion constants R, the particle-internal diffusion coefficients D and the delay time τd were determined, respectively. The results showed that the exchange rate is controlled by the film diffusion at the start of the reaction, and is controlled by the particle internal diffusion in the rest time of the ion exchange. The influences of temperature and concentration on the exchange rate, the exchanged amount in the equilibrium and delay time in the diffusion process were discussed also.

Key words: Ion exchange kinetics, Clinoptilolite