以N,N'-亚甲基双丙烯酰胺为单体紫外光接枝制备抗污染PVDF超滤膜

Preparation of a novel anti-fouling PVDF UF membrane modified by UV grafting using N, N'-methylene bisacrylamide as monomer

采用紫外光照接枝N,N'-亚甲基双丙烯酰胺单体的改性方法,对聚偏氟乙烯(PVDF)平板超滤膜进行抗污染改性,研究不同紫外接枝改性条件对膜性能的影响。通过扫描电镜、全反射红外光谱对改性前后膜的表面微观形貌和结构进行表征。结果表明,膜的表面变得更加光滑,引入的亲水性基团,提高了亲水性。在单体浓度为0.7 mol/L,光照时间为3 min的条件下,改性效果最好;膜的抗污染性能最佳,同时改性对膜的通量影响较小。该改性方法的主要优点是通过水相接枝液就可对PVDF表面进行改性,大大降低改性实验的要求和成本。

In this paper, the N, N＇-methylene bisacrylamide is used as the monomer to graft onto the PVDF membrane under the UV irradiation. The anti-fouling performance of the PVDF membrane is observed under different experiment conditions. The modified membrane is characterized by the attenuated total reflection-Fourier transform infrared spectroscopy （ATR/FT-IR） and the scanning electron microscope （SEM）. It is shown that the surface of the membrane becomes smooth, and the hydrophilic group is introduced onto the membrane. And the anti-fouling performance is the best when the monomer concentration is 0.7 mol/L, and the illumination time is 3 min. The main advantage of this method is that the membrane is easily modified by the water phase.