膜科学与技术

新型ɑ-纤维素/聚砜共混超滤膜的制备与性能研究

作者：郑虹¹，² 介兴明¹ 于海军¹ 李霞¹，² 况武¹，² 陈勇³ 曹义鸣

单位： 1. 中国科学院大连化学物理研究所,大连116023; 2. 中国科学院大学,北京100049;3.辽宁华孚环境工程股份有限公司,124013

关键词： ɑ-纤维素；NMMO?H2O；共混；超滤；亲水改性

出版年,卷(期):页码： 2015,35(6):1-8

摘要：

以聚砜为原材料，在铸膜液中添加ɑ-纤维素，采用浸没沉淀法制备了新型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72º降低为51º，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．膜抗污染能力测试[将此处改为“能量恢复情况”，并且请全文统一。另外终审专家提出：能量恢复情况和污染阻力是否可以完全证明抗污染性能的提高，请统一说法]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，抗污染性能提高明显。

A novel blend membrane prepared by ɑ- cellulose and polysulfone(PSF) using immersion-precipitation process. This paper mainly studied the influence of solvent system on the preparation process and　filtration performance of blend membrane. It was found that only three solvents: N,N-dimethyl-Acetamide(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 has been 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 has been 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 has been obviously improved by blending α-cellulose. With NMMO•H2O+NMP as solvent the CA has been lowered from 72º to 51º; the water flux was improved to about 443.40L/m2•h, which is 2.6 folds higher than PSF membrane (121.95L/m2•h); and at the same time the BSA fluid flux has been increased 1.7 folds compared with the original PSF membrane. What is more, the rejection rate still maintained above 95%. With an anti-fouling test, the membrane prepared by NMMO•H2O+NMP showed a higher flux recovery rate, which means it has a better hydrophicility and owns broader application prospect.

郑虹(1990一 )，女，陕西省咸阳市人，硕士生，从事分离膜的开发和应用．

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