@article{MTMT:35424842,
	title = {Poly(ether-ether-ketone) copolymers featuring sulfonyl moieties for organic solvent nanofiltration membranes},
	url = {https://m2.mtmt.hu/api/publication/35424842},
	author = {Alqadhi, N. and Oldal, D.G. and Gopalsamy, K. and Abdulhamid, M.A. and Székely, György},
	doi = {10.1016/j.seppur.2024.129628},
	journal-iso = {SEP PURIF TECHNOL},
	journal = {SEPARATION AND PURIFICATION TECHNOLOGY},
	volume = {355},
	unique-id = {35424842},
	issn = {1383-5866},
	abstract = {Poly(ether-ether-ketone) (PEEK) is an attractive material for membrane fabrication due to its exceptional thermal and chemical stability. However, traditional PEEK processing necessitates the use of harsh chemicals, such as sulfuric acid because of its limited solubility in organic solvents. To overcome this limitation, copolymers offer a solution by enhancing solubility and subsequently improving membrane characteristics such as permeability and selectivity. Herein, three novel copolymers – PEEK with various contents of SO2 and CH3 – were developed and used in membranes for the separation of polar and non-polar solvents. The chemical structure of the copolymers was tailored by varying the monomer ratio between 0.25 and 0.75 for CH3 and SO2 containing monomers. Diamine–crosslinked PEEK copolymer membranes were prepared using a green solvent (TamiSolve). The effects of the polymer structure, the dope solution rheology, and membrane properties together with separation performance were studied. The resulting membranes demonstrated a permeance for acetonitrile ranging from 7.4 to 8.2 L m−2 h−1 bar−1 with molecular weight cutoffs of 839–915 g mol−1. Molecular dynamic simulations were conducted to explore the interaction between the copolymers and nine different organic solvents. Our findings underscore the significance of copolymer design in achieving tailored membrane properties for diverse separations. © 2024 Elsevier B.V.},
	keywords = {rheology; ORGANICS; Nanofiltration; copolymer; Membrane properties; Nanofiltration membranes; organic solvent nanofiltration; organic solvent nanofiltration; Green solvent; Greener solvents; membrane fabrication; Thermal and chemical stabilities; Nafion membranes; poly(ether-ether-ketone); poly(ether-ether-ketone); SO 2; Poly ether ether ketones; Poly(ether ether ketones)},
	year = {2025},
	eissn = {1873-3794}
}

@article{MTMT:36199525,
	title = {Membranes for the pervaporation of solvent azeotropes: from molecular to process design},
	url = {https://m2.mtmt.hu/api/publication/36199525},
	author = {Esposito, R. and Di Vincenzo, M. and Gopalsamy, K. and Ganesan, S. and Upadhyaya, L. and Grande, C. and Székely, György and Nunes, S.P.},
	doi = {10.1016/j.cej.2025.163728},
	journal-iso = {CHEM ENG J},
	journal = {CHEMICAL ENGINEERING JOURNAL},
	volume = {515},
	unique-id = {36199525},
	issn = {1385-8947},
	abstract = {The separation of organic solvents in the chemical industry is highly energy-intensive, particularly when dealing with azeotropic solvent mixtures for which conventional distillation is ineffective. Addressing the growing environmental concerns, waste generation, and high energy consumption associated with solvent lifecycles requires the development of highly permeable and selective membranes for sustainable solvent recovery. Pervaporation represents a promising, energy-efficient alternative. In this work, we report the fabrication of thin-film composite membranes exhibiting outstanding permselectivity for toluene–methanol mixtures, achieved through interfacial polymerization. The polarity of the nanofilms was enhanced through the incorporation of various hydrophilic amine-functionalized structures. By precisely overcoming the trade-off between selectivity and permeability observed in previously reported polymeric pervaporation membranes. The highest separation performance was attained by combining interfacial polymerization with post-functionalization using polyethyleneimine, yielding an impressive separation factor of 642 and a flux of 4.1 kg m−2h−1. This corresponds to 800 % improvement in selectivity compared to the control polyamide membrane for a 10 wt% methanol and 90 wt% toluene mixture. Long-term stability tests demonstrated the remarkable durability of the post-functionalized membranes, with minimal permeance variation in the methanol concentration of the permeate (∼1.5 %). Process simulations confirmed that integrating pervaporation with distillation enables significantly more energy-efficient and cost-effective operations, underscoring the potential of the developed membranes for polar-non-polar solvent separation applications. An energy balance analysis further highlighted the substantial energy efficiency gains achievable with hybrid pervaporation-distillation systems compared to conventional methods. © 2025 Elsevier B.V.},
	keywords = {ENERGY; distillation; Chemical Industry; Solvent extraction; Dialysis; Concentration (process); Phase separation; SOLVENT MIXTURES; Pervaporation; Pervaporation; ORGANICS; Precipitation (chemical); POLYCONDENSATION; Energy efficient; Environmental concerns; Distillation columns; Azeotropes; Process intensification; Process intensification; interfacial polymerization; Interfacial polycondensation; non-polar; polyamide membranes; Polyamide membrane; Polar-non-polar separation; Polar-non-polar separation},
	year = {2025},
	eissn = {1873-3212}
}

@article{MTMT:34364278,
	title = {Solution-processable poly(ether-ether-ketone) membranes for organic solvent nanofiltration: from dye separation to pharmaceutical purification},
	url = {https://m2.mtmt.hu/api/publication/34364278},
	author = {Alqadhi, Nawader and Abdellah, Mohamed H. and Nematulloev, Sarvarkhodzha and Mohammed, Omar F. and Abdulhamid, Mahmoud A. and Székely, György},
	doi = {10.1016/j.seppur.2023.125072},
	journal-iso = {SEP PURIF TECHNOL},
	journal = {SEPARATION AND PURIFICATION TECHNOLOGY},
	volume = {328},
	unique-id = {34364278},
	issn = {1383-5866},
	abstract = {Through polymer engineering, the membrane properties can be considerably changed and its performance can be improved. Organic solvent nanofiltration (OSN) membranes require polymers with good solution processability to facilitate membrane preparation. However, the resultant membranes should have excellent solvent resistance. Poly(ether-ether-ketone) (PEEK) is a potential polymer for OSN applications because of its high thermal stability and excellent solvent resistance. However, commercial PEEK has limited solution processability, and its fabrication requires a harsh acidic environment. Herein, two customized PEEKs were synthesized by incorporating methyl (-CH3) and sulfonyl (SO2) groups into the polymer backbone. The membranes were prepared by phase inversion using N-methyl-2-pyrrolidone (NMP) and TamiSolve as a green alternative. The effects of the polymer structure, green solvent, and crosslinking on the membrane morphology, chemical and mechanical stability, as well as separation performance have been examined. The molecular interaction between organic solvents and PEEKs were investigated through molecular dynamic simulations and density functional theory. The molecular weight cutoff (MWCO) values of the membranes were 540-768 g mol-1, with a high corresponding permeance of 8.2-20 L m- 2 h-1 bar-1 in acetone. The long-term stability of membranes was successfully demonstrated over two weeks through a continuous crossflow filtration using acetone under a pressure of 30 bar. The membranes demonstrated excellent active pharmaceutical ingredient purification through the removal a 2-methoxyethoxymethyl chloride (125 g mol-1) carcinogenic impurity from roxithromycin (837 g mol-1).},
	keywords = {organic solvent nanofiltration; Green solvent; poly(ether-ether-ketone); Solvent-resistant membranes; Pharmaceutical purification},
	year = {2024},
	eissn = {1873-3794},
	orcid-numbers = {Székely, György/0000-0001-9658-2452}
}

@article{MTMT:24740513,
	title = {Molecular Separation with Organic Solvent Nanofiltration: A Critical Review},
	url = {https://m2.mtmt.hu/api/publication/24740513},
	author = {Marchetti, P and Solomon, MFJ and Székely, György and Livingston, AG},
	doi = {10.1021/cr500006j},
	journal-iso = {CHEM REV},
	journal = {CHEMICAL REVIEWS},
	volume = {114},
	unique-id = {24740513},
	issn = {0009-2665},
	year = {2014},
	eissn = {1520-6890},
	pages = {10735-10806}
}