Preparation and Performance of High-Performance Nanofiltration Membranes Based on Functionalized Ionic Liquids

HU Ran, KANG Jian, ZHANG Yi, XIANG Ming

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Plastics Science and Technology ›› 2024, Vol. 52 ›› Issue (08) : 60-64. DOI: 10.15925/j.cnki.issn1005-3360.2024.08.012
Processing and Application

Preparation and Performance of High-Performance Nanofiltration Membranes Based on Functionalized Ionic Liquids

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Abstract

1-aminopropyl-3-methylimidazole bromide (AMIB) was used as an aqueous additive to prepare high-performance nanofiltration membranes by interfacial polymerization. The chemical composition of the membranes was analyzed by Fourier transform infrared spectrometry and X-ray photoelectron spectroscopy, and the changes in the surface and cross-section morphology of the membranes before and after the modification were observed by scanning electron microscope. The changes in the roughness of the membranes were observed by atomic force microscope, and the membrane surface hydrophilicity before and after modification was compared by water contact angle tester. The separation performance and water flux of the membrane before and after modification were tested by staggered-flow filtration flat-plate membrane tester. The results showed that compared with the unmodified NF membranes, the modified membranes had a looser structure, a thinner membrane thickness, and the surface became hydrophilic. The modified membranes maintained a high level of 99% rejection of Na2SO4 while the water flux was greatly increased from 50.27 L/(m2·h) before modification to 75.97 L/(m2·h). The long-term stability was excellent. The mechanism linking the structure and performance of AMIB composite modified nanofiltration membranes was further explored, which provided new ideas and methods for the preparation of high-performance nanofiltration membranes

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Polyamide / Nanofiltration membrane / Ionic liquids / High-performance

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HU Ran , KANG Jian , ZHANG Yi , et al. Preparation and Performance of High-Performance Nanofiltration Membranes Based on Functionalized Ionic Liquids. Plastics Science and Technology. 2024, 52(08): 60-64 https://doi.org/10.15925/j.cnki.issn1005-3360.2024.08.012

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