摘要
以聚醚砜为膜材料,聚乙烯吡咯烷酮(PVP)为添加剂,N,N-二甲基乙酰胺为溶剂,采用相转化法制备了聚醚砜超滤膜。通过制膜液粘度、膜的孔隙率、表面接触角、机械性能以及对牛血清蛋白分离性能的测试和扫描电镜(SEM)对膜孔结构的观察,研究了PVP的添加量对聚醚砜制膜液粘度及其膜结构和性能的影响。结果表明,PVP的添加提高了膜的亲水性和制膜液的粘度,但膜的抗拉强度有所降低;膜的水通量随着PVP含量的增加先升高后降低,在5%时最大水通量是508.33L/(m2·h),而此时牛蛋白截留率最小为66.27%;SEM观察的结果是膜的断面上部形成指状孔结构,下部形成海绵状孔结构,当PVP含量为5%时膜有斜指状孔结构,且指状孔也逐渐延伸到膜的底部,其壁为稀疏的海绵状孔结构。
Flat uhrafiltration membranes were successfully prepared by phase inversion method, using polyethersulfone（PES） as raw materials, dimethylacetamide as solvent and polyvinypyrrolidone （PVP） as pore forming additive. The effect of PVP concentration in the casting solution on viscosity of casting solution and performance of PES membrane such as hydrophilicity, tensile strength, pure water flux, retention of BSA, porosity and morphologies of cross section of membranes were investigated. The results showed that the addition of PVP enhanced not only the viscosity of the casting solution but also the hydrophilicity of uhrafiltration membrane. However. the tensile strength of membrane tended to decrease. The pure water flux of PES membrane increased in the beginning and then decreased as the concentration of PVP increased. There were a maximum of pure water flux at 508.33 L/（m^2·h） and a minimum of the retention of BSA at 66.27 % when the mass fraction of PVP in the casting solution reached 5 % appropriately. SEM results showed that finger-like pores were formed in the upper part of the support layer, and sponge-like pores were formed in the lower part. When the concentration of PVP was about 5%, large-sized finger-like pores extended to the bottom of the membrane, and sponge-like pores were observed in the wall of finger-like pores.
出处
《净水技术》
CAS
2009年第1期67-71,共5页
Water Purification Technology
