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Preparation of polyimide / UiO-66 thin film nanocomposite membrane and its nanofiltration performance

Authors： DAI Xinlei, MA Wenzhong, ZHONG Jing, Zhang Xinmiao, Meng Fanning

Units： 1. Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, China; 2. Jiangsu Key Laboratory of Environment-Friendly Polymer Materials, School of Materials Science and Engineering, Changzhou University, Changzhou 213164, China; 3. Environmental Protection Institute, Sinopec Beijing Research Institute of Chemical Industry

KeyWords： UiO-66；aqueous phase added； organic phase added； polyimide

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2024,44(2):89-96

Abstract：

Traditional nanofiltration membranes still experience a "trade-off" phenomenon, where they cannot enhance membrane flux without compromising rejection. To solve this problem， Introduce two metal-organic frameworks (MOFs), UiO-66 and UiO-66-NH2, as nanomaterials into aqueous and organic phases, respectively. Four different polyimide (PI) composite nanofiltration (NF) membranes were prepared by interfacial polymerization reaction and imidization treatment. to study the effects of UiO-66 amination and the influence of different adding methods on membrane structure and separation performance. The water contact results showed that the four PI composite NF membranes had better hydrophilic properties compared to pure PI NF membranes. The nanofiltration performance showed that the UiO-66-NH2-doped aqueous phase had the best nanofiltration performance with 91% CaSO4 rejection and 219 L/（m2·h·MPa） water flux. The fluxes of the four PI composite NF membranes were attenuated by less than 0.1% after soaking in organic solvents (THF, DMAc, MT, NMP) for 48 h. CaSO4 rejection did not change much (attenuation <1%); flux attenuation ranged from 9~17 L/（m2·h·MPa） during 120 h of long-term operation, indicating good stability.

Funds：

中国石油化工股份有限公司科技项目(219020-2)，江苏省研究生科研与实践创新计划项目(KYCX22_3096)

AuthorIntro：

代新雷（1998-），男，安徽宿州人，硕士研究生，研究方向膜分离，E-mail：daixinlei7501@163.com

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