摘要
以聚砜(PSF)为原材料,在铸膜液中添加ɑ-纤维素,采用浸没沉淀法制备新型ɑ-纤维素/聚砜共混超滤膜.主要考察了溶剂因素对共混膜的制备及渗透性能的影响.实验发现:N,N-二甲基乙酰胺(DMAc),N-甲基吡咯烷酮(NMP),NMP与N-甲基吗啉N-氧化物水合物(NMMO·H2O)混合溶剂均可用于制备共混膜;红外光谱(FTIR)、热重(TG)、差式扫描量热法(DSC)和扫描电子显微镜(SEM)表征表明,NMMO·H2O+NMP混合溶剂所制得的膜聚合物共混均匀,膜表面较为光滑,无明显缺陷,是α-纤维素和聚砜共混铸膜体系的良溶剂;膜性能测试结果表明,加入α-纤维素的共混膜亲水性得到明显改善,水接触角由72°降低为51°,纯水通量和牛血清蛋白(BSA)溶液通量分别为443.40L/(m2·h)和147.65L/(m2·h),比纯聚砜膜增加约2.6倍和1.7倍,同时对BSA的截留率保持在95%以上.膜通量恢复情况结果表明,以混合溶剂制备的分离膜水洗后通量恢复率较高,污染阻力小,通量恢复能力提高明显.
A novel blend membrane was prepared byɑ-cellulose and polysulfone（PSF）using immersionprecipitation process.This paper mainly studied the influence of solvent system on the preparation process and filtration performance of the blend membrane.It was found that only three solvents：N,N-dimethylacetamide（DMAc）,N-methyl pyrrolidone（NMP）,N-methyl pyrrolidone（NMP）and N-methylmorpholine N-oxide hydrate（NMMO· H2O）can be used to prepare blend membranes successfully.Among them,NMMO·H2O＋NMP was proved to be the best solvent.The membranes were characterized by Fourier transform infrared spectroscopy（FTIR）,thermogravimetry（TG）,Differential scanning calorimetry（DSC）and scanning electron microscopy（SEM）.It was confirmed that cellulose in the casting solution dissolved by NMMO· H2O＋NMP was better-distributed,and its surface was smoother without any significant defect than the blend membranes prepared by other solvents.The tests of contact angle（CA）,water flux and fluid of Bovine serum albumin（BSA）flux indicated that the hydrophilicity of PSF membrane was obviously improved by blendingα-cellulose.With NMMO·H2O＋NMP as solvent the CA lowered from 72°to 51°;the water flux was improved to about 443.40L/（m2·h）,which is 2.6times higher than PSF membrane,121.95L/（m2·h）;and at the same time the BSA fluid flux increased 1.7times compared with the original PSF membrane.What is more,the rejection rate still maintained above95%.With an anti-fouling test,the membrane prepared by NMMO·H2O＋NMP showed a higher flux recovery rate,which means it had a better hydrophicility and had a broader application prospect.
出处
《膜科学与技术》
CAS
CSCD
北大核心
2015年第6期1-8,共8页
Membrane Science and Technology
基金
国家自然科学基金(21206157)
国家科技支撑计划项目(2014BAI11B13)
