Electric double layer and its application to the membrane separation

摘要：

Electric double layer plays crucial role in the membrane separation. In this work the nanofiltration membrane pores are modeled as slit-like pores with fixed pore size and surface electrical potential. The extended Nernst-Planck equation is used for the calculation of the ion fluxes through the membrane pores, in which the local concentrations of electrolyte ions on the membrane surfaces are evaluated from the Donnan equilibrium model and the net charge densities on the membrane surfaces are predicted from the Poisson-Boltzmann theory and density functional theory derived from the modified fundamental-measure theory. The calculated results show that at a higher electrolyte concentration, the density functional theory is more suitable for description of electric double layer near membrane surface and rejection of electrolyte than the Poisson-Boltzmann theory.

关键词： Membrane separation Nanofiltration Electrolyte solutions Extended Nernst-Planck Density functional theory

作者: Bo Peng Sheng Fu YangXin Yu GuangHua Gao

作者单位: Department of Chemical Engineering, Tsinghua University, Beijing 100084 P.R.China

会议类型: 国际会议

会议名称: The 5th International Conference on Separation Science and Technology(第五届国际分离科学与技术会议)

会议地点: 北京

会议语种:英文

在线出版日期: 2007-10-14（万方平台首次上网日期，不代表论文的发表时间）