单组分电解质溶液中纳滤膜的反射系数  

Reflection coefficient of nanofiltration membranes in single electrolyte solution

作　　者：涂丛慧[1] 尚伟娟[1] 王晓琳[1] 

机构地区：[1]清华大学化学工程系,北京100084

出　　处：《化工学报》2007年第6期1507-1513,共7页CIESC Journal

基　　金：国家重点基础研究发展计划项目(2003CB615701)。~~

摘　　要：The space-charge(SC)model and Teorell-Meyer-Sievers(TMS)model combined with irreversible thermodynamics model are applied to predict the transport coefficients of nanofiltration membranes in single electrolyte solution.The reflection coefficient has been numerically calculated by the SC model and analytically calculated by TMS model.The results show that the reflection coefficient approaches unit in the range of low-concentration regime and approaches zero in the range of high-concentration.While the diffusion coefficients ratio of co-ion over counterion is less than 1.0,the reflection coefficient is positive over the whole concentration range.When the ratio is larger than 1.0,the reflection coefficient is negative in a certain intermediate concentration region.And the increase of the surface charge density and the decrease of the pore radius cause the increase in the reflection coefficient.The SC model and TMS model show good agreement in the calculation of the reflection coefficient when the dimensionless potential gradient in the pore surfaces is less than 1.0 and the pore radius is less than 5.0 nm.The space-charge （SC） model and Teorell-Meyer-Sievers （TMS） model combined with irreversible thermodynamics model are applied to predict the transport coefficients of nanofiltration membranes in single electrolyte solution. The reflection coefficient has been numerically calculated by the SC model and analytically calculated by TMS model. The results show that the reflection coefficient approaches unit in the range of low-concentration regime and approaches zero in the range of high- concentration. While the diffusion coefficients ratio of co-ion over counterion is less than 1. 0, the reflection coefficient is positive over the whole concentration range. When the ratio is larger than 1. 0, the reflection coefficient is negative in a certain intermediate concentration region. And the increase of the surface charge density and the decrease of the pore radius cause the increase in the reflection coefficient. The SC model and TMS model show good agreement in the calculation of the reflection eoefficient when the dimensionless potential gradient in the pore surfaces is less than 1.0 and the pore radius is less than 5.0 nm.

关 键 词：反射系数 空间电荷模型 固定电荷模型 纳滤膜 

分 类 号：TQ021.4[化学工程]