Abstract:

PVDF ultrafiltration membranes were prepared by the phase-inversion method with different contents Ag₃PO₄ powders dispersed uniformly in the PVDF casting solution. The microstructure, separation performance and antifouling ability of such PVDF membrane and modified membranes were investigated using SEM, contact angle, cross flow filtration, and antifouling measurements, and cleaning effect for the fouled membrane was also observed. The modified membranes exhibited differences in microstructure and properties due to a specific content of Ag₃PO₄ powders addition. At mass fraction 1% Ag₃PO₄, the thickness of skin layer decreased while fine interfacial micropores increased, meanwhile the modified membranes had excellent water permeability, hydrophilicity, mechanical properties, antifouling ability and elevated retention for humic acid (HA)solution. In addition, sunlight/water cleaning in aeration could effectively recover the flux of PVDF₁ membrane to above 85%.

Key words: membrane, filtration, separation performance, Ag₃PO₄, fouling, hydrophilicity

摘要：

将不同量Ag₃PO₄均匀地分散在聚偏氟乙烯(PVDF)铸膜液中, 利用相转化法制备了改性PVDF膜, 通过扫描电镜(SEM)、接触角测定、过滤实验和污染性测试等研究了其微结构、分离性和耐污染性等, 并考察了膜污染后的清洗效果。结果表明, 添加Ag₃PO₄ 的PVDF膜具有不同的微结构与性能, 当添加1% 的Ag₃PO₄时, 膜皮层变薄、微孔数增多, 并呈现出最优化的水通量、亲水性、力学性、抗污染能力和截留率等。采用太阳光-水清洗能使改性膜的通量恢复率达到85%以上。

关键词: 膜, 过滤, 分离性, Ag₃PO₄, 膜污染, 亲水性