Faculty Publications
Permanent URI for this communityhttps://idr.nitk.ac.in/handle/123456789/18736
Publications by NITK Faculty
Browse
5 results
Search Results
Item Biopolymeric Nanofibrous Materials for Environmental Remediation(wiley, 2022) Pallavi, K.C.; Isloor, A.M.The present content gathers information regarding the use of nanofibrous materials fabricated out of biopolymers in environmental problems. Biopolymers are environment-friendly and nonhazardous in character. Various conventional methods have been employed so far to solve problems, such as water pollution, air contamination, and soil infertility. Membranes of different types, filtration systems, and various sorbents have been found useful in the removal of contaminants. Apart from all those, nanofibrous materials attain great importance due to their noncomparable high surface area, minute pore size, diameter in the nanorange, and good adsorptive property. Nanofibers can be fabricated out of diverse polymers through various techniques, such as electrospinning. The surface modifications, such as chemical grafting and oxygen plasma treatment induced functional group insertion, can be done, which imparts high potential in respective applications. The present review chapter describes about nanofiber fabrication technique, properties of the resultant nanofiber mat, and their importance in environmental remediation, such as removal of airborne and waterborne contaminants. © 2022 Scrivener Publishing LLC.Item Influence of palm oil fuel ash, an agro-industry waste on the ultrafiltration performance of cellulose acetate butyrate membrane(Taylor and Francis Inc. 325 Chestnut St, Suite 800 Philadelphia PA 19106, 2016) Shenvi, S.S.; Isloor, A.M.; Ahmad, A.L.; Garudachari, B.; A.F., A.F.Palm oil fuel ash (POFA), which is produced as waste during production of palm oil, was used as an alternative additive to prepare cellulose acetate butyrate (CAB) composite ultrafiltration membrane. Acid-activated-milled POFA was characterized by Brunauere–Emmette–Teller (BET) surface area analysis and infrared spectroscopy (IR). The effect of incorporation of POFA in CAB matrix was analyzed by contact angle, water uptake, and porosity studies. The studies revealed an enhancement in the hydrophilic nature of the composite membranes upon addition of POFA. The change in the morphology of the membranes was recorded by means of scanning electron microscopy (SEM) which revealed the changing asymmetric structure of the membrane. Pure water flux and antifouling studies indicated that the membranes exhibited enhanced flux recovery ratio, which was maximum for CAB 2 (87.6%) containing 2 wt.% of POFA. The adsorption property of POFA in addition to CAB/POFA network helped in the humic acid removal from aqueous solution up to 86% for CAB 2.5 membrane. © 2016 Balaban Desalination Publications. All rights reserved.Item Fabrication of a novel hollow fiber membrane decorated with functionalized Fe2O3 nanoparticles: Towards sustainable water treatment and biofouling control(Royal Society of Chemistry, 2017) Hebbar, R.S.; Isloor, A.M.; Kulal, K.; Abdullah, M.S.; A.F., A.F.The development of sustainable, surface-functionalized hollow fiber membranes with advanced nanomaterials has enabled the tailoring and targeted control of their physicochemical properties. This provides the material with improved features of hydrophilicity and permeability, excellent selectivity, and superior antifouling and antimicrobial activity. We explored a new strategy using well dispersed functionalized Fe2O3 nanoparticles to fabricate a polyetherimide nanocomposite hollow fiber membrane with enhanced surface and anti-biofouling properties. To confirm the membrane modification, a series of characterizations such as contact angle, surface energy, water uptake capacity, porosity, zeta potential, and morphological analysis were performed. The permeation experiment indicated superior hydrodynamic permeability and antifouling properties with more than 95% rejection of BSA protein molecules after inclusion of a 1.5 wt% additive dosage. Moreover, the nanocomposite membrane exhibited a relatively higher normalized flux and rejection up to 94% during the filtration of hazardous natural organic matter (NOM) with differing parameters such as the feed solution pH and ionic strength. The presence of modified Fe2O3 nanoparticles in the membrane significantly inhibits the growth of bacteria and other microorganisms on the membrane surface, resulting in an enhanced anti-biofouling property. In particular, the demonstrated method illustrates a fast, facile strategy for the functionalization of Fe2O3 nanoparticles to improve the membrane properties and anti-biofouling activity, giving them great potential for effective and sustainable water treatment applications. © 2017 The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.Item Tuning the surface properties of Fe3O4 by zwitterionic sulfobetaine: application to antifouling and dye removal membrane(Springer, 2020) Gnani Peer Mohamed, G.P.; Isloor, A.M.; Siddique, I.; Asiri, A.M.; Farnood, R.In this paper, zwitterionic polysulfobetaine@Fe3O4 (PSBMA@Fe3O4) nanoparticles were synthesized via covalent grafting and free radical polymerization and characterized. The PSBMA@Fe3O4 noparticles had a zeta potential of ? 36 mV (pH 6.3), which guaranteed the high colloidal stability. The as-synthesized nanoparticles were employed as a nanofiller to prepare superior antifouling polysulfone hybrid hollow fiber membranes. The FM-2 membrane exhibited the maximum pure water permeability of 61.1 L/m2 h bar with humic acid (HA) removal efficiency of 98%. The fouling resistance was evaluated using HA as a foulant, and the results suggested that the FM-2 membrane had less amount of HA adsorption with flux recovery ratio of 88.4%. Furthermore, the FM-2 membrane was demonstrated the reactive black-5 and reactive orange-16 removal of above 99% and 84% without much reduction in the dye solution permeability. © 2020, Islamic Azad University (IAU).Item Efficient multi-pollutant removal: The role of Keggin polyoxometalates in polysulfone-chitosan blend membranes(Elsevier B.V., 2025) Fashapoyeh, M.A.; Shokrollahzadeh, S.; Isloor, A.M.; Streb, C.Membrane filtration is a vital area in separation science, providing an effective method for water purification due to the unique properties of membranes. This study presents the development of blend membranes composed of polysulfone (PS), chitosan (CS), and polyvinyl alcohol (PVA), incorporating two types of Keggin polyoxometalates: K?[?-SiW??O??] ({SiW11}) and K?[?-SiW??O??] ({SiW12}) at a concentration of 0.05 to 1.0 wt% each. Our findings reveal that the incorporation of 0.1 wt% {SiW11} results in an optimum membrane exhibiting high porosity, a finger-like pore structure, and enhanced hydrophilicity. This membrane achieves a water flux of 34.8 L/m2h and significantly enhances the simultaneous removal of multiple pollutants. Specifically, this membrane achieved rejection rates of >88 % for heavy metal ions (Ni2+, Cu2+, and Pb2+) and > 98 % for organic dyes (Congo Red and Methylene Blue). The improved rejection rates and water fluxes observed with the optimal amounts of polyoxometalates (POMs) can be attributed to the combined effects of surface charge (Donnan effect), size exclusion, and adsorption at the binding sites of the POMs. Notably, the nanofiltration membrane containing {SiW11} outperformed the one with {SiW12} in filtering multi-contaminant solutions, underscoring its superior effectiveness. © 2025 Elsevier B.V.