多巴胺及环氧丙醇改性PP中空纤维膜的制备及抗污染性能研究

Preparation and Anti-pollution Properties of Dopamine and Glycidol Modified PP Hollow Fiber Membrane

利用多巴胺(DA)的氧化自聚合在聚丙烯(PP)中空纤维膜表面沉积一层聚多巴胺薄层(PDA),制备了PP-PDA膜,再经过聚多巴胺中氨基与环氧丙醇(GD)的开环反应对膜进行进一步表面修饰,制备了多羟基改性PP中空纤维复合膜(PP-GD膜)。采用傅里叶变换红外光谱及扫描电子显微镜表征了膜的化学结构及表面性能;通过对牛血清白蛋白(BSA)的抗污染测试研究了原膜及改性膜的抗污染性能及纯水恢复性能。结果表明,成功制备了多巴胺及环氧丙醇改性的PP中空纤维复合膜,改性膜的表面变得更为致密和光滑;在BSA质量浓度为1g/L时,PP原膜、PP-DA膜、PP-GD膜的稳定通量分别为15.3、18.7、22.1L/(m^2·h);膜清洗测试显示,PP-GD膜的通量恢复率最高,达到90.6%,说明多巴胺及环氧丙醇改性能够有效增加PP膜的亲水性能及抗污染性能。

Dopamine （DA） and glycidol （GD） modified polypropylene （PP） hollow fiber membranes were prepared by depositing a layer of poly-dopamine （PDA） onto the membrane surface followed by the ring-opening reaction between the amine of dopamine and glycidol. The chemical composition and morphology of the membrane were characterized by Fourier transform infrared spectroscopy and scanning electron microscope tests. Bovine serum albumin （BSA） was used to test the anti-pollution and recovery properties of the pristine and modified membranes. The results show that DA and GD were successfully introduced onto the PP hollow fiber membrane surface, which led to more dense and smooth membrane surface. When the concentration of BSA is 1 g/L, the steady flux of PP, PP-PDA membrane and PP-GD membrane is about 15.3, 18.7, 22. 1 L/（m2 · h） , respectively. Membrane washing experiments show that the flux recovery ratio of PP-GD membrane is about 90.6 % , the highest of all. The PP-GD modification improves the hydrophilic and anti-fouling of PP membrane significantly.