聚砜中空纤维超滤膜的微孔结构对初始通量衰减的影响

Effect of microporous structure of polysulfone hollow fiber ultrafiltration membrane on initial flux attenuation

以纯水和聚乙二醇-20000水溶液为原液,考察了指状孔和海绵状孔两种不同微孔结构的聚砜中空纤维超滤膜初始通量的衰减现象.结果表明:其衰减现象主要是在压力作用下膜微孔结构压缩致密化和膜孔堵塞造成的;在相同压力下,具有较薄致密层和指状孔结构的聚砜中空纤维膜比基本上为海绵孔结构的聚砜中空纤维膜的微孔更加稳定,表现为前者的膜通量衰减小于后者.

The effect of two different microporous structure which is finger-like and sponge-like on flux decrease rate ofhollow fiber ultrafiltration membrane was studied with pure water and polyethylene glycol -20000 aqueoussolution. The results showed that the initial flux attenuation phenomenon was mainly caused by that structure ofmembrane was compacted and pore of membrane was blocked. Under the same pressure, the finger -likestructure was more stable than the sponge-like structure, the flux attenuation of the finger-like structure wasmore low than that of the sponge-like structure.