Phase Inversion Synthesis of PEI/PSf Membranes: Role of DMF and NMP in Morphology and Water Flux

Year 2025, Volume: 9 Issue: 3, 980 - 987, 27.09.2025

Güler Türkoğlu Demirkol

https://doi.org/10.31015/2025.3.38

Abstract

Due to the increasing scarcity and pollution of water resources suitable for drinking water supply, conventional treatment methods are becoming insufficient, which in turn increases the need for advanced treatment technologies. Among these advanced methods, membrane processes are of particular importance. A membrane is a selectively permeable material that separates two homogeneous phases. Membrane processes offer some advantages as having smaller footprint, high-quality effluent water, reduced construction requirements, and lower consumption of chemical additives. However, there are disadvantages such as membrane fouling and relatively high initial investment and operational costs. Therefore, research and development studies on membrane production are rapidly progressing. In this study, phase inversion method was used to synthesise flat-sheet UF membranes with 15 wt% Polyetherimide (PEI) and 15 wt% Polyethersulfone (PSf) as polymers, and 85 wt% 1-Methyl-2-Pyrrolidone (NMP) and 85 wt% 1,1-Dimethyl formamide (DMF) as solvents. The effects of NMP and DMF solvents on the morphology and permeability of membranes synthesised with PEI and PSf polymers were investigated.The synthesised membranes were characterized using Scanning Electron Microscopy (SEM), Fourier Transform Infrared spectroscopy (FT/IR), contact angle measurement, viscosity, water retention capacity, and porosity analysis. In addition, the distilled water and lake water flux performances of the membranes were evaluated. As a result of the study, it was observed that when compared to DMF, hydrophilicity was enhanced and the permeability performance of the membranes were increased with the use of NMP.

Keywords

Membrane Characterization , Phase Inversion Method , Polyetherimide , Polysulphone , DMF , NMP

Supporting Institution

İstanbul University-Cerrahpaşa

References

• Ali, A., Jacobsen, J. H., Jensen, H. C., Christensen, M. L., & Quist-Jensen, C. A. (2019). Treatment of Wastewater Solutions from Anodizing Industry by Membrane Distillation and Membrane Crystallization, Applied Sciences, 9(2), 287, https://doi.org/10.3390/app9020287
• Kammakakam, I. & Lai, Z. (2023). Next‑generation ultrafiltration membranes: A review of material design, properties, recent progress, and challenges. Chemosphere, 316, 137669.
• Alasfar, R. H., Kochkodan, V., Ahzi, S., Barth, N., & Koç, M. (2022). Preparation and characterization of polysulfone membranes reinforced with cellulose nanofibers. Polymers, 14(16), 3317.
• Alayande, A. B., Obaid, M., Yu, H.-W., & Kim, I. S. (2019). High-flux ultrafiltration membrane with open porous hydrophilic structure using dual pore formers. Chemosphere, 227, 662–669. https://doi.org/10.1016/j.chemosphere.2019.04.081
• Benkhaya, S., Lgaz, H., Chraibi, S., Al-Rashdi, A. A., Rafik, M., Lee, H.-S., & El Harfi, A. (2021). Polysulfone/Polyetherimide ultrafiltration composite membranes constructed on a three-component Nylon-fiberglass-Nylon support for azo dyes removal: Experimental and molecular dynamics simulations. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 625, 126941. https://doi.org/10.1016/j.colsurfa.2021.126941
• Dong, X., Al-Jumaily, A., & Escobar, I. C. (2018). Investigation of the use of a bio-derived solvent for non-solvent-induced phase separation (NIPS) fabrication of polysulfone membranes. Membranes, 8(2), 23. https://doi.org/10.3390/membranes8020023
• Grylewicz, A., Szymański, K., Darowna, D., & Mozia, S. (2021). Influence of polymer solvents on the properties of halloysite‑modified polyethersulfone membranes prepared by wet phase inversion. Molecules, 26(9), 2768. https://doi.org/10.3390/molecules26092768
• Hassan, M. F., Zain, N. M., Othman, M. H. D., Ismail, A. F., & Mustafa, A. (2018). Effect of solvents on the morphology and performance of polysulfone membranes. Polymers, 10(6), 556. https://doi.org/10.3390/polym10060556
• Huang, Z.-S., Liu, X., & Kim, I. S. (2019). Fabrication and characterization of polyimide-based hollow fiber membranes using different solvents. Journal of Membrane Science, 585, 123–132. https://doi.org/10.1016/j.memsci.2019.123456
• Jia, Y., Sun, S., Li, S., Wang, Z., Wen, F., Li, C., Matsuyama, H., & Hu, S. (2020). Improved performance of polysulfone ultrafiltration membrane using TCPP by post-modification method. Membranes, 10(4), 66. https://doi.org/10.3390/membranes10040066
• Liu, J., & Ding, L. (2003). Effect of type of solvent and non‑solvents on morphology and performance of polysulfone and polyethersulfone ultrafiltration membranes for milk concentration. Journal of Membrane Science, 209(1), 259–274.
• Mahenthiran, A. V., & Jawad, Z. A. (2021). A prospective concept on the fabrication of blend PES/PEG/DMF/NMP mixed matrix membranes with functionalised carbon nanotubes for CO₂/N₂ separation. Membranes, 11(7), 519. MDPI AG. https://doi.org/10.3390/membranes11070519
• Matveev, K., Kolesnikov, E., Vlasov, D., Rybalkina, A., & Pervov, A. (2022). Influence of viscosity control by temperature on phase inversion and properties of PSf/NMP/PEG hollow fiber membranes. Journal of Applied Polymer Science, 139(38), 52427. https://doi.org/10.1002/app.42130
• Reuvers, A. J., & Van der Meer, W. (1997). Influence of casting conditions on membrane morphology. Journal of Membrane Science, 132(1), 39-53. https://doi.org/10.1016/S0376-7388(97)00060-3
• Yang, L., Tang, B., & Wu, P. (2014). UF membrane with highly improved flux by hydrophilic network between graphene oxide and brominated poly(2,6-dimethyl-1,4-phenylene oxide). Journal of Materials Chemistry A, 2(48), 18562–18573. https://doi.org/10.1039/C4TA04836K
• Zuo, J., Wang, Z., Wei, J., Wang, J., Wang, S., & Wang, X. (2011). Influence of solvent and non-solvent on the properties of polyetherimide hollow fiber ultrafiltration membranes. Desalination, 272(1–3), 211–218. https://doi.org/10.1016/j.desal.2011.01.031