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Fabrication and performance of poly(piperazine-amide) nanofiltration membrane with innate positive charge

Authors： WANG Yingwei, ZHANG Mengmeng, JIANG Chi, HOU Yingfei

Units： 1Sinopec Petroleum Engineering Design Co. LTD, Dongying, 257026; 2University of Petroleum (East China), Qingdao 266580

KeyWords： positively charged nanofiltration membrane; Interfacial polymerization; poly(piperazine-amide

ClassificationCode：TQ028

year,volume(issue):pagination： 2023,43(2):41-48

Abstract：

The charge on the surface of nanofiltration membrane is one of the most important factors that affect the separation performance of nanofiltration membrane. The traditional polypiperazine amide nanofiltration membrane has negative charge on the surface, thus show a relatively low rejection toward divalent cations such as calcium and magnesium. In this paper, a positively charged poly (piperazine amide) nanofiltration membrane was prepared by reducing the interfacial resistance of monomer and enhancing the interfacial driving force of monomer, promoting the diffusion of piperazine monomer to the oil phase and leaving an excess of Amino groups after the interfacial polymerization. The chemical properties, surface morphology, structure and chargeability of the composite membranes were characterized by infrared spectroscopy, XPS, SEM, AFM, Zeta potential meter and other instruments, and the membrane properties were evaluated by cross-flow test. The results showed that the nanofiltration membrane showed excellent retention characteristics of positively charged membrane, and the retention sequence of different salt solutions was CaCl2＞NaCl＞Na2SO4, in which CaCl2 retained 95.3%, flux 118.4 L·m-2·h-1·MPa-1;.

Funds：

国家重点研发计划项目（2019YFE0115600）；中国博士后科学基金（2021M693502）

AuthorIntro：

王英伟（1982年10月），男，山东单县，高级工程师，本科，学士，油气田地面工程及分离工程，wangyw.osec@sinopec.com

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