有机无机复合膜通过在有机网络中引入无机质点，可提高膜的机械性能和热稳定性、改善和修饰膜的孔结构和分布，并提高膜的渗透性能和分离选择性。以聚醚砜（PES）为复合膜基体、导电镧锶钴铁（LSCF）纳米粒子为无机填充剂、硅烷偶联剂为表面改性剂制备LSCF/PES复合多孔膜。研究聚合物浓度、LSCF含量及偶联剂改性条件等参数对复合膜孔结构和渗透选择性能的影响规律。通过施加低压直流电场，研究导电LSCF/PES复合多孔膜与渗透液及辅助电场间的协同作用。详细考察膜孔结构、表面电荷密度、渗透液浓度、离子荷电类型、电场方向及强度等参数对渗透过程中的离子迁移及截留的影响规律。在荷电膜分离模型的基础上，揭示复合多孔膜的离子截留机理。通过优化复合膜制备工艺参数和弱电场作用下的离子分离机理，在低能耗的条件下，实现分离膜的渗透选择性的显著提高，对于降低海水淡化及含离子废水的处理成本具有重要的理论意义和实际价值。

Organic/Inorganic composite membrane can enhance the membrane mechanical properties, improve the thermal stability, optimize the membrane pore structure and distribution, adjust the hydrophilic/hydrophobic balance, increase membrane permeability and separation selectivity by introducing inorganic particles into organic network. PES is used as substrate of the composite microporous membrane, conductive lanthanum strontium cobalt iron (LSCF) nano-particles are used as inorganic filler and coupling agent as surface modification agent for the preparation of LSCF/PES composite membrane. Effect of polymer concentration, the content of LSCF, modification conditions on the pore structure and permeability of composite membrane are studied. Low voltage electric field is applied in the both sides of the conductive composite membrane. The relation among the conductive LSCF/PES composite microporous membrane, permeate solution and auxiliary electric field is studied. Effect of membrane pore structure, surface charge density, permeate concentration, ionic charge type, electric field direction and strength are studied to demonstrate the influence on migration in the process of ion penetration. On the basis of charged membrane separation model, the ion rejection mechanism will be revealed. The separation mechanism of composite membrane prepared by ion optimization of process parameters under the weak electric field are researched. With low energy consumption, significantly improvement of selectivity of the membrane, has important theoretical significance and practical value to reduce the processing cost of seawater desalination and ion containing waste water.