摘要
利用湿法相转化方法，通过在聚醚砜（PES）铸膜液中添加适量的纳米粒径的SiO2，制得了具有不同含量纳米SiO2的PES／SiO2杂化膜。对分相过程中的成膜动力学、膜的微观结构以及性能进行了分析测试，结果表明与纯PES相比，铸膜液中添加了4wt％纳米SiO2后，PES体系的成膜速度有所提高。膜断面的SEM照片表明，PES／SiO2杂化膜有更大的指状孔。膜性能测试结果表明，体系中SiO2含量对PES杂化膜的纯水通量和截留率有影响，在添加的纳米SiO2的含量较少时，所得PES杂化膜的截留率明显升高，水通量则相反而有所降低；随着体系中SiO2含量的进一步增加，PES／SiO2杂化膜的水通量明显增大，同时增强的截留率也得到了保持。
By means of wet phase inversion process, blending adequate quantity of nano-SiO2 in the polyethersulfone （PES） casting solution, the PES/SiO2 hybrid membranes were prepared. The kinetics of membrane formation, mierostructure and properties were tested and analyzed. The results showed that comparison with natural PES casting solution, there was enhanced phase separation speed of casting solution under the condition of containing 4 wt% of nano- SiO2 in PES matrix. The SEM photos indicated that there were much larger finger pores in the section of PES/nano-SiO2 hybrid membrane. The properties of pure water flux and retention were affected during the SiO2 concentration increasing in the PES composite. At lower content of SiO2 in the PES composite, the retention of membrane was increased evidently while the pure water flux oppositely decreased. With increasing the concentration of SiO2, the pure water flux was increased obviously, meanwhile, the retention could be kept enhancement.
基金
天津科技大学科学研究基金资助项目（项目编号：20050213）
