Abstract: Positively charged nanofiltration membrane of polysulfone/Al2O3 composite was prepared by a immersion process. The influence of main technical conditions during membrane preparation on membrane transport parameters was studied including pure water flux，Na+ transport parameter and streaming potential. The morphologies of membrane surface and cross-section were observed by SEM. The structure of membrane surface active layer and and its formation mechanism were analysed by FTIR. In the enrichment of gold from thiourea leaching solution，the prepared membrane has a better rejection performance. At 0.65 MPa and 20℃，the rejection of gold(Ⅲ) could be reached to about 88%—95%.

摘要： 采用含浸法制备聚砜/Al₂O₃复合荷正电纳滤膜。探讨各种主要工艺条件对膜分离性能的影响。通过测定膜流动电位及其对不同无机盐阳离子截留率，分析制膜条件对膜电性能的影响。利用扫描电镜（SEM）分析膜表面及截面形貌，利用傅里叶红外光谱仪（FTIR）分析表面活性层结构及成膜机理。对硫脲浸金液中Au（Ⅲ）进行富集分离研究，Au（Ⅲ）的截留率可达88％～95％，为膜法分离贵金属提供了新的思路。