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Preparation and performance study of asymmetric polyacrylonitrile nanofiltration membrane

Authors： LI Shiqi， WANG Han， HOU Shuhua，, ZHANG Qifeng, ZHANG Suobo

Units： 1.College of Chemistry and Materials Engineering, Bohai University, Jinzhou 121013, China) 2. Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Key Laboratory of Eco-Environmental Polymer Materials, Changchun 130022, China

KeyWords： Polyacrylonitrile；Nanofiltration membrane；Volatile co-solvent；Selectivity；Dye wastewater treatment.

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2021,41(3):118-125

Abstract：

Polyacrylonitrile (PAN) is a bulk synthetic polymer material with low price, strong weather resistance, and excellent chemical stability. PAN has been successfully applied to the preparation of ultrafiltration and microfiltration membranes, but facing challenges in preparation of nanofiltration membranes. In this paper, domestic PAN was used as raw material, N, N-dimethylacetamide (DMAC) as solvent and tetrahydrofuran (THF) as co-solvent, asymmetric nanofiltration membranes were prepared through an one-step non-solvent induced phase inversion process (NIPS). By adjusting the heat treatment temperature before the phase inversion of the liquid membrane layer, regulating the volatilization of THF on the membrane surface, the skin compactness of the PAN membrane obtained could be controlled, and nanofiltration membranes would be obtained. The morphology, hydrophilicity, surface streaming potential and other properties of the obtained membranes were systematically characterized, and the water flux and the retention of salt ion as well as small molecule dyes were tested. The results indicated that as the heat treatment temperature of the liquid membrane layer increased, the permeation flux of the resulted membranes to salt solutions gradually decreased, and the rejection to the corresponding salt ions gradually increased. And the highest rejection to Na2SO4 was detected, reaching at 85.6%. The optimized membrane showed a flux of 2.14-111.5 L/(m2•h) for the six studied dye aqueous solutions, and the rejection to dyes with relatively higher molecular weight could reach over 99.8%. The obtained membranes could meet the application requirements for the decolorization of the dye aqueous solution. PAN has been proven to be a low-cost nanofiltration membrane material for dye wastewater treatment.

Funds：

吉林省科技发展计划（20190302057GX）, 国家自然科学基金（2191160739），中国科学院青年创新促进会会员基金（2017270）

AuthorIntro：

李仕琦（1995-）女，黑龙江双鸭山人，在读硕士，从事聚合物分离膜材料制备技术研究

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