Faculty Publications

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Author: search.filters.author.Farnood, R.Subject: search.filters.subject.Composite membranes

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    Effective removal of hazardous atrazine and chlorpyrifos by waste PET bottles-derived linker having novel MIL-53(Al)/PMMA-nanofiber incorporated poly(vinylidene) fluoride membranes
    (Elsevier Ltd, 2025) Prabhakar, N.; Isloor, A.M.; Farnood, R.
    Synthesis of novel MIL-53(Al)/PMMA nanofiber and its incorporation into PVDF thin-film composite flat-sheet membranes for the rejection of hazardous herbicides and pesticides from water is the crux of this work. Initially, poly (methyl methacrylate) polymer dope solution with MIL-53(Al) dispersed in the matrix was subjected to electrospinning to get a novel nanofiber. The linker terephthalic acid, here was derived from waste PET bottles. Both the MOF and nanofibers were characterized using BET, FTIR, zeta potential, and XRD. The optimized nanofibers were used as additives in the TFC in different weight percentages using synthesized porous PVDF as support. TFC Membranes were analyzed by pure water flux, chlorpyrifos, and atrazine rejection. MPM-2 with 0.05 wt% nanofiber gave a pure water flux of 18.6824 Lm?2h?1. The rejection of chlorpyrifos (a hazardous pesticide) was 86.8 % for MPM-2 membranes and atrazine (a herbicide) gave rejection of 60.48 %. Further, membranes gave excellent antifouling property with FRR of 95.45 %. © 2025 Elsevier Ltd
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    Development of polymeric ionic poly(VBC-co-VI) nanoparticle incorporated thin film nanocomposite membranes for dye and salt rejection
    (Royal Society of Chemistry, 2025) Mendonca, N.R.; Isloor, A.M.; Farnood, R.
    Water is an important life-sustaining liquid. However, due to the current anthropogenic activities, this resource is diminishing. This work explores a method for the potential reuse of textile wastewater containing salts by utilization of thin film composite (TFC) membranes fabricated by means of interfacial polymerization on a macroporous membrane substrate composed of 15% polysulfone (PSf). A relatively lesser known variety of nanoparticles termed ionic polymeric nanoparticles were integrated into the dense polyamide (PA) layer. The ionic poly(VBC-co-VI) nanoparticles were synthesized in the laboratory via quaternary precipitation polymerization (QPP) of the monomers 1-vinyl imidazole (VI) and 4-vinybenzyl chloride (VBC) by the utilization of 2,2?-azobis(2-methylpropionitrile) (AIBN) as the free radical initiator in the solvent acetonitrile (ACN) in a single step. The synthesized nanoparticles existing in the PA layer improved the water permeability as well as the rejection capacity of the membranes. The fabricated membranes showed a dye rejection of 98% for Reactive Black 5 and >95% for Sunset Yellow FCF having a concentration of 100 ppm. The salt rejection for NaCl, MgCl, Na2SO4 and MgSO4 at 1000 ppm concentration was found to be 36%, >50%, 85% and 85%, respectively. © 2025 The Royal Society of Chemistry.
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    Fabrication and incorporation of MIL-53(Fe)-zwitterionic brushes into PVDF thin film composite membranes for enhancing heavy metal/dye rejection from aqueous body
    (Elsevier B.V., 2025) Prabhakar, N.; Isloor, A.M.; Farnood, R.; Fauzi Ismail, A.
    The bioaccumulation of heavy metal ions is a serious concern for researchers. The dyes and heavy metal ions also aquatic life impacting the biodiversity adversely. Synthesis of novel MIL-53(Fe)-PSBMA particles, and its incorporation into PVDF-based thin-film composite membranes is the crux of this work. Firstly, H2N-MIL-53(Fe) was synthesized by metal displacement reaction which was then modified into MIL-53(Fe)-PSBMA brushes. The brushes were synthesized by atom transfer radical polymerization method. The amine groups of the NH2-MIL-53(Fe) help connecting the MOF to the polymeric moiety. The as-synthesized material and the fabricated TFCs were characterized by BET, FTIR, XRD, XPS, TGA, AFM, FE-SEM, zeta potential, and DLS particle sizer. The presence of sulphur groups on the XPS spectrum of modified MOF ensured the successful polymer grafting on it. Zwitterionic moieties have both positive and negative charges within a single molecule which gave a resultant zeta potential of ?13.1 mV for the brushes. A pure water flux of 26.32 Lm?2 h?1 and 97.33 %, 95.19 %, 82.06 %, and 78.47 % rejections for Pb2+, Hg2+, As3+, Cd2+ ions and 96.23 % and 94.04 % rejection for 100 ppm reactive black-5 and sunset yellow dyes respectively were obtained for the optimized membrane having 0.035 wt% loading of zwitterionic MOF. This result was attributed to the enhanced membrane hydrophilicity which was also correlated with contact angle and water uptake studies. © 2024 Elsevier B.V.