中文摘要：

对纳米SiO2改性聚偏氟乙烯（SiO2／PVDF）离子交换膜电渗析处理单组分电解质溶液进行了试验研究。结果表明，在不同操作条件下，SiO2／PVDF离子交换膜的极限电流密度和脱盐率均大于未改性聚偏氟乙烯（PVDF）离子交换膜。SiO2／PVDF离子交换膜的极限电流密度随着淡水流量和电解质浓度的增加而增加；随着电流强度的增加，SiO2／PVDF离子交换膜的脱盐率也相应增加；随着淡水流量增加，脱盐率会逐渐降低。为使SiO2／PVDF离子交换膜用于电渗析过程获得良好的脱盐效果和节约能量，NaCl质量浓度为500mg／L时电流密度应控制在1．17mA／cm2。

英文摘要：

The new nano-SiO2 modified polyvinylidene fluoride （SiO2/PVDF） ion-exchange membrane was applied in electrodialysis （ED） with single component electrolyte; the desalination performance of SiO2/PVDF ion-exchange membrane in ED process was investigated. The experimental data showed that the limited current density （LCD） and desalination ratio of SiO2/PVDF ion-exchange membranes were higher than those of PVDF membranes at different operating conditions. LCD values of SiO2/PVDF increased with increasing dilute flow rate and electrolyte concentration, In addition, an increase in current led to the increase in the desalination ratio, while the higher dilute flow rate would decrease the desalination ratio of SiO2/PVDF. In order to achieve better desalination efficiency and save energy, the current density should be kept at 1.17 mA/cm^2 when the NaCl concentration of ED was 500 mg/L.