摘要
以N,N-二甲基甲酰胺(DMF)、N,N-二甲基乙酰胺(DMAc)、N-甲基吡咯烷酮(NMP)为溶剂,水为非溶剂,制备了不同结构的聚砜超滤膜,并考察其对超滤膜过滤性能测试体系-聚乙二醇水溶液的过滤性能.发现纯水通量主要是由超滤膜表面的孔结构所决定,孔径越大通量越高;聚乙二醇水溶液的过滤性能由膜表面的孔结构和截面结构所决定,膜表面的孔径越小、截面是海绵结构的超滤膜的截留率越高.并且通过理论模拟与动态激光光散射的数据比较,发现聚乙二醇的分子链在经过超滤膜时形态发生了明显变化.
DMF, DMAc. NMP have been used as solvent for polysulfone, and water as non-solvent to produce ultrafiltration membranes with different structures. The filtration properties have been tested with PEG Solutions. The results showed that the fluxes of pure water for these membranes are determined with the holes＇ structures on surface, and it increased with enlarging holes diameter. The rejection data showed that both screen and depth filter mechanism worked to PEG molecules, the rejection increased with decreasing the holes diameter and the volume of finger structures. Combined with the theoretic analysis and the data from dynamic light scattering of PEG solutions, we found out that the shape of PEG molecules changed dramatically near the holes on the surface of ultrafiltration membranes.
出处
《膜科学与技术》
CAS
CSCD
北大核心
2013年第5期43-47,共5页
Membrane Science and Technology
关键词
聚砜
超滤膜
通量
截留率
polysulfone
ultrafiltration
flux
rejection
