【摘要】 铈盐和聚乙二醇(PEG)组成氧化还原体系引发丙烯腈聚合,获得亲水改性的聚丙烯腈(PAN)共聚物(PAN-PEG-PAN)。以二甲基甲酰胺(DMF)和水分别为溶剂和非溶剂,通过相转换法制得PAN-PEG-PAN微孔膜。考察了微孔膜形貌、水通量及其处理废水效果随共聚物中PEG含量(WEG)的变化规律。结果发现,微孔膜的通量及孔隙率随WEG增加都呈现先增大后下降的现象,当WEG为0.096时通量和孔隙率均达到其最大值,分别为965.6L·m-2·h-1和83.0%;PAN-PEG-PAN微孔膜处理模拟废水时,可截留粒径在100nm以上的微粒,并使废水的透光率从32.1%增加到98.7%;处理印染废水时,滤液的透光率随WEG的增加而增加,而膜的通量衰减程度明显低于PAN微孔膜。因此,用少量PEG改性的PAN共聚物膜可明显改变微孔膜的亲水性及其形貌结构,提高膜的水通量、分离性以及抗污染性。更多还原

【Abstract】 The polyacrylonitrile-poly(ethylene glycol)-polyacrylonitrile (PAN-PEG-PAN) block copolymers were synthesized by polymerization of PAN triggered by the help of redox reaction of the ceric ion-alcohol system. The modified PAN membrane and the PAN-PEG-PAN microporouse membrane were prepared via phase inversion method with DMF as solvent and water as non-solvent. The water flux and porosity of the prepared PAN-PEG-PAN microporous membrane were studied, and the results show that both of them increase with the increase of the PEG content (WEG) in the modified PAN microporouse membrane at first, and then decrease with the further increase of WEG. When the PEG content WEG is 0.096, the water flux and the porosity of the modified membrane reach their maximum value of 965.6 L·m-2·h-1 and 83.0%, respectively. It was found that the prepared modified PAN microporouse membrane can reject the particles larger than 100 nm in the model wastewater and raise the light transmission ratio of the filtrate from 32.1% to 98.7%. When using the modified PAN microporouse membrane to treat the dyeing wastewater, the light transmission ratio of the filtrate increases with the increase of WEG in the modified PAN microporous membrane, and the degree of flux decreasing with operation time is obviously lower than that of PAN microporous membrane. It could be concluded that adding only a little amount of PEG as modified reagent can change the hydrophilicity, porosity and inner cross-section morphology of the modified PAN microporouse membrane, and therefore increase the filtration flux, separation performance and contamination resistance of the membrane.更多还原