摘要
推导了荷电镶嵌膜单盐溶液和混合盐溶液的Donnan平衡模型 ,指出荷电镶嵌膜对无机电解质具有较低的截留率 ,可实现电解质与低分子有机物的有效分离 .对于理想的荷电镶嵌膜 ,电解质能自由地通过 ;在混合盐体系中 ,离子的分配系数有可能大于 1 ,导致离子的负截留率 .Donnan平衡模型可定性地预测电解质的截留率关系 ,并由截留率关系判断膜的正、负荷电性 .
The Donnan equilibrium model of charge-mosaic membrane is studied for the single salt solution and salts mixture. It indicates that charge-mosaic membrane has a low retention to inorganics.Especially in the case of ideal mosaic membrane,inorganics can permeate it freely;but to salts mixture,the ditribution coefficient of ions may be greater than 1,and lead to a negative retention.Using the Donnan equilibrium model,we can predict the retention of different salt electrolytes ,and can also judge whether the membrane is positive or negative through the retention relationship.
出处
《郑州大学学报(工学版)》
CAS
2002年第4期98-101,共4页
Journal of Zhengzhou University(Engineering Science)
基金
河南省高校杰出科研人才创新工程资助项目 (2 0 0 1KYCX0 0 6)