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Preparation and Characterization of α-cellulose/polysulfone blend UF membrane

Authors： ZHENG Hong 1,2, JIE Xing-ming1, YU Hai-jun1, LI Xia1,2, KUANG Wu 1,2 , CAO Yi-ming1

Units： 1Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;) （2 University of Chinese Academy of Sciences, Beijing 100049, China

KeyWords： α-cellulose; NMMO?H2O; Blend; Ultrafiltration; Hydrophilic modification

ClassificationCode：0631;TQ028.8

year,volume(issue):pagination： 2015,35(6):1-8

Abstract：

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.

Funds：

国家自然科学基金（批准号：21206157）和国家科技支撑计划项目（批准号：2014BAI11B13）资助．

AuthorIntro：

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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