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The fabrication of coordination nanofiltration membrane based on interfacial coupling technology

Authors： WANG Qian, WANG Guangrui, ZHAO Yin, SUN Shi-Peng

Units： State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing, China 211816

KeyWords： Nanofiltration; Coordination membrane; Interfacial coupling; Surface modification

ClassificationCode：TQ051.893

year,volume(issue):pagination： 2021,41(2):1-8

Abstract：

Traditional thin-film composite nanofiltration membranes fabricated by interfacial polymerization possess intermolecular force as the interaction between the active layer and substrate. This may lead to the peel-off of the active layer during the working process. In this work, based on the introduction of the coordination bond between the active layer and substrate, the active layer with nanofiltration performance was fabricated on a polyimide substrate by metal-organic coordination technology. Firstly, the modification degree of the substrate was optimized by investigating the effect of the NaOH concentration and the reaction time on the morphology and functional groups of the substrate surface. The optimum concentration and reaction time are 0.01 mol/L and 9 min respectively. Then, the coordination center Fe3+ was introduced to the substrate by replacing the Na+ on the modified substrate with Fe3+. Finally, the effect that the ratio of metal coordination centers and organic ligands has on the membrane performance were studied, and the optimized mole ratio of PA and Fe3+ is 3:7. The hydrophilicity and negative charge of the obtained membrane are both enhanced. The rejection and permeability of the coordination nanofiltration membrane towards 1000 ppm Na2SO4 solution is 85.6% and 5.3 L m-2h-1bar-1 respectively. Additionally, the membranes have a high rejection towards a variety of dyes and excellent long-term stability.

Funds：

：国家自然科学基金面上项目（21878146）；江苏省自然科学基金杰出青年项目（BK20190037）

AuthorIntro：

王乾（1993-），男，江苏盐城人，博士研究生，研究方向为有机纳滤膜的制备及应用， E-mail：chandler@njtech.edu.cn

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