耐污染PVDF/C-PAES共混膜的制备及其性能

Preparation and properties of contamination-resistantPVDF/C-PAES blending membrane

利用含羧基的亲水聚芳醚砜材料,采用共混改性方法制备耐污染聚偏氟乙烯共混超滤膜。通过扫描电子显微镜、水的静态接触角以及拉伸强度、牛血清蛋白溶液过滤实验测试,考察了亲水聚芳醚砜共混比对膜的结构、表面亲水性、机械强度、渗透通量的影响。研究结果表明,增大聚芳醚砜共混比一定程度上减弱了超滤膜的机械强度,同时膜表面亲水性和耐污染性能被显著增强;当共混比为3∶1时,正洗后的膜通量恢复率为85%左右,显示出理想的耐污染性能及在污水处理中可观的应用前景。

Polyvinylidene fluoride blending ultrafiltration membrane was prepared by blending modification method with hydrophilic polyether sulfone containing carboxyl group as raw material. The effects of polyaromatic ether sulfone blending ratio on the structure, surface hydrophilicity, mechanical strength and osmotic flux of the membrane were investigated by SEM, tests of static contact angle of water and tensile strength, filtration test of bovine serum protein solution. The results showed that the mechanical strength of ultrafiltration membrane was weakened to some extent by increasing the blending ratio, while the surface hydrophilicity and pollution resistance of ultrafiltration membrane was significantly enhanced. The flux recovery rate of membrane after forward washing was up to 85% with 3∶1 blending ratio, which exhibited the ideal pollution resistance and considerable application prospect in treatment of wastewater.