摘要
以不同浓度聚乙二醇(PEG)与PSF共混,采用相转化法制备超滤膜,通过扫描电镜考察膜的结构,测试了所制备膜的亲水性和超滤性能;考察了膜的抗污染能力及在含油污水中的应用。结果表明,当PEG的浓度为10 wt%时,水通量达到最大值382.7 L.(m2.h)-1,是不加PEG时的4倍。膜的亲水性也显著提高,从而增强了膜的抗污染能力,并在处理含油废水的实验中,使通量和除油率同时提高,提高了膜的工作效率,延长了膜的使用寿命。研究了PSF/PEG共混超滤膜体系中PEG作用的规律。PEG浓度的增加,改变了PSF/PEG铸膜液体系的相平衡关系,使铸膜液成为热力学不稳定体系,加速了相分离的发生。另外,适量添加PEG,提高了膜表面的孔隙率,抑制膜结构中指状孔的形成和发展。
By means of phase inversion, ultrafiltration membranes were prepared with PSF/PEG blend. Scanning the structure of the membranes, we tested its ultrafiltration （UF）, hydrophilicity; saw about the antipollution ability and application in the oiliness water. Results showed that when the concentration of the PEG was 10 wt%, the water flux reached the maximum 382.7 L · （m^2· h）^-1 which was the 4 times of that without PEG. The hydrophilicity of the membrane was improved obviously also, consequently, its antipollution ability was getting better. In the experiment of dealing with the oiliness waste water, the membranes made both the flux and deoil rate increase. So the efficiency of the membrane was enhanced and its lifespan was extended. The functions of PEG in PSF/ PEG blend ultrafiltration membrane system were studied. The increase of PEG concentration changed the phase balance in the PSF/PEG casting membrane liquid system which became an unstable one, and speeded up the phase separate. Also, the proper addition of PEG would increase the hole rate in the surface of the membrane and check the formation and development of middle-finger hole in the membrane structure.
出处
《长春工业大学学报》
CAS
2006年第4期298-301,共4页
Journal of Changchun University of Technology
基金
长春工业大学科学研究发展基金(04110)
关键词
共混超滤膜
PSF
PEG
亲水性
blend ultrafiltration membrane
PSF
PEG
hydrophilicity.
