Modified polyvinylidene fluoride membranes for effective removal of iron ions (Fe2+) from water

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dc.contributor.authorBubela, Halynaen_US
dc.contributor.authorKonovalova, Viktoriiaen_US
dc.contributor.authorKujawa, Joannaen_US
dc.contributor.authorKujawski, Wojciechen_US
dc.date.accessioned2025-03-13T09:29:20Z
dc.date.available2025-03-13T09:29:20Z
dc.date.issued2025
dc.description.abstractPaper introduces an efficient technique for removing excess Fe(II) ions from water using modified polyvinylidene fluoride membranes. Capability for Fe(II) removal was investigated for three types of PVDF membranes (pristine PVDF, PVDF/Fe3O4 blend, and PVDF/Fe3O4 blend membrane with additional immobilization of Fe3O4 nanoparticles using polymer spacer. Structures and morphologies of membranes were analyzed through various techniques (IR, SEM, AFM, water contact angle, zeta potential), revealing that Fe3O4 nanoparticles were successfully incorporated into the membrane matrix and/or the membrane surface. The surface modification resulted in increased hydrophilicity of the membrane surface, as indicated by a decrease of WCA from 106.1◦±3◦ to 74.8◦±2◦. The isoelectric point changed from 3.5 ± 0.2 to 7.9 ± 0.2 after the attachment of polyethyleneimine (PEI) owing to the cationic nature of the polymer linker. Membranes were tested in an ultrafiltration process using polyacrylic acid (PAA) as an agent for the binding of Fe(II) into the coordination complex. The modified membranes demonstrated a hydrodynamic permeability coefficient of 17.1 LMH⋅bar-1, which is approximately 2.5 times higher than the pristine PVDF membrane. The surface-modified PVDF membranes maintained a high rejection of Fe(II)-PAA coordination complex (97.1 and 99.4 %, respectively) at a pH of 8, leading to the decrease of concentration of Fe(II) in permeate from 20 ppm to 0.08 ppm and 0.11 ppm, meeting the standards set by the World Health Organization (0.3 ppm) and European Union Regulation (0.2 ppm). Modified PVDF/Fe3O4 membranes show potential applications in water purification from heavy metals owing to many advantages, including higher flux rates and rejection ability.en_US
dc.identifier.citationModified polyvinylidene fluoride membranes for effective removal of iron ions (Fe2+) from water / Bubela H., Konovalova V., Kujawa J., Kujawski W. // Results in Engineering. - 2025. - Vol. 25. - Art. no. 104312. - https://doi.org/10.1016/j.rineng.2025.104312en_US
dc.identifier.issn2590-1230
dc.identifier.urihttps://doi.org/10.1016/j.rineng.2025.104312
dc.identifier.urihttps://ekmair.ukma.edu.ua/handle/123456789/33937
dc.language.isoenen_US
dc.relation.sourceResults in Engineeringen_US
dc.statusfirst publisheden_US
dc.subjectPVDF membraneen_US
dc.subjectmembrane surface modificationen_US
dc.subjectFe3O4 nanoparticlesen_US
dc.subjectmagnetically active membranesen_US
dc.subjectFe2+ removalen_US
dc.subjectarticleen_US
dc.titleModified polyvinylidene fluoride membranes for effective removal of iron ions (Fe2+) from wateren_US
dc.typeArticleen_US
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