Faculty Publications
Permanent URI for this communityhttps://idr.nitk.ac.in/handle/123456789/18736
Publications by NITK Faculty
Browse
6 results
Search Results
Item Modification of PSf/PIAM membrane for improved desalination applications using Chitosan coagulation media(2013) Kumar, R.; A.F., A.F.; Kassim, M.A.; Isloor, A.M.Polysulfone (PSf)/poly (isobutylene-alt-maleic anhydride) (PIAM) nanofiltration membranes were modified by changing the coagulation bath with various concentrations of glutaraldehyde cross-linked Chitosan solutions. Further the membranes were treated with 0.1N NaOH solution in order to achieve the hydrolysis of PIAM. The morphological changes of the membranes were determined using scanning electron microscope. The blending of PSf/PIAM membrane, the incorporation of Chitosan (CS) molecules in membrane matrix and the hydrolysis of PIAM in the membrane upon alkali treatment were studied by Attenuated Total Reflectance Infra Red (ATR-IR) spectroscopy. The hydrophilicity of modified membranes was measured using the contact angle analyzer. The pressure and time dependent pure water flux of modified PSf/PIAM/CS membranes were measured and compared with PSf/PIAM membranes (after alkali treatment). The antifouling property of membranes was determined using Bovine Serum Albumin (BSA) protein rejection studies. The modified membranes showed improved hydrophilicity and reduced pore size. The order of rejection of membranes for various electrolytes was Na2SO4>MgSO4>NaCl at minimum pressure of 0.2MPa TMP. The antifouling property of modified membranes increased with an increase in the composition of Chitosan in coagulation bath and membrane M-0.8 showed a maximum fouling resistance ratio of 74%. © 2013 Elsevier B.V.Item Performance improvement of polysulfone ultrafiltration membrane using N-succinyl chitosan as additive(2013) Kumar, R.; Isloor, A.M.; A.F., A.F.; Matsuura, T.A water soluble chitosan derivative, N-succinyl chitosan (NSCS), was blended with polysulfone (PSf) in three different compositions to fabricate PSf/NSCS blend membranes. The blending of polymers was confirmed by Attenuated Total Reflectance Infra-Red (ATR-IR) spectroscopy. The membranes were characterized by Scanning Electron Microscopy (SEM) images for their cross-sectional morphology. Pure water flux, water uptake and contact angle of the PSf/NSCS blend membranes were measured and compared with the pristine polysulfone membrane. The PSf/NSCS blend membranes showed enhanced hydrophilicity and permeation fluxes compared to the pristine polysulfone membrane. The membrane antifouling property was determined by filtering the bovine serum albumin (BSA) solution. The maximum flux recovery ratio (FRR) of 70% was observed by the PSf/NSCS blend membrane with 20% NSCS content. The PSf/NSCS membranes with the PSf:NSCS ratios of 80:20 and 90:10 showed nearly the same fluxes as those of polysulfone/polyethylene glycol (PSf/PEG) blend membranes with the same compositions. The hydrophilic derivative of chitosan NSCS acted as an excellent additive in improving PSf ultrafiltration properties. © 2013 Elsevier B.V.Item Antifouling and performance enhancement of polysulfone ultrafiltration membranes using CaCO3 nanoparticles(2013) Nair, A.K.; Isloor, A.M.; Kumar, R.; A.F., A.F.Calcium carbonate nanoparticles were synthesized from calcium nitrate via chemical precipitation method. The nanoparticles were characterized using scanning electron microscope (SEM), Attenuated total reflectance infra red (ATR-IR) spectrum and by X-ray diffraction (XRD). These nanoparticles were used as additive for polysulfone (PSf) ultrafiltration membrane along with polyethylene glycol (PEG) as pore forming agent. The PSf hybrid membranes were characterized by ATR-IR, XRD, and SEM studies. ATR-IR and XRD results indicated the successful incorporation of the nanoparticles in the membranes. Cross sectional images of the membranes along with the elemental mapping of calcium on the membrane surface were assessed using SEM. Hydrophilicity of the membranes was evaluated in terms of contact angle measurements. The permeability of the membranes was determined by measuring the pure water flux (PWF). Membranes were also subjected to antifouling studies using bovine serum albumin (BSA) as the standard protein for rejection. The membranes showed better permeability and antifouling property with the increased addition of CaCO3 nanoparticles. © 2013 Elsevier B.V.Item Performance enhancement of polysulfone ultrafiltration membrane using TiO2 nanofibers(Taylor and Francis Inc. 325 Chestnut St, Suite 800 Philadelphia PA 19106, 2016) Nair, A.K.; Shalin, P.M.; JagadeeshBabu, P.E.Titanium dioxide nanofibers were synthesized via alkaline hydrothermal method using TiO2 nanopowder. The hydrothermal method was optimized by studying the operating variables to obtain nanosized TiO2 fibers. These nanofibers were used to make composite polysulfone ultrafiltration membranes along with polyethylene glycol as pore forming agent. The obtained samples were characterized using scanning electron microscope, X-ray diffraction, and attenuated total reflectance infrared spectroscopy. Contact angle measurements were used to estimate hydrophilicity of the membrane. Performance of the membrane was analyzed using pure water flux studies and antifouling studies with bovine serum albumin as the standard protein for rejection. The composite membranes exhibited better performance in both permeability and antifouling property. © 2015 Balaban Desalination Publications. All rights reserved.Item Synthesis and characterization of silver decorated polysulfone/cellulose acetate hybrid ultrafiltration membranes using functionalized TiO2 nanoparticles(Desalination Publications dwt@deswater.com, 2017) Sri, K.S.; Nair, A.K.; JagadeeshBabu, J.Amine functionalized TiO2 nanoparticles were synthesized via surface reaction with 3-Aminopropyl triethoxysilane. These nanoparticles were added to polysulfone and cellulose acetate blend casting solutions in 1-Methyl-2-pyrrolidone to form hybrid membranes by phase inversion. The amine groups on the surface of the membranes were used as absorption sites for silver nanoparticles. The obtained membranes were characterized using Fourier Transform Infra Red spectroscopy, Scanning electron microscope and X-ray diffraction. Water uptake studies and contact angle measurements were done to evaluate hydrophilicity of the membranes. Pure water flux studies of the membrane were carried out in a dead end filtration unit. Rejection and antifouling studies were carried out using bovine serum albumin as a model protein. The hybrid membranes exhibited better permeability and fouling resistance. The hybrid membranes with silver decoration on the surface showed microbial resistance. © 2017 Desalination Publications. All rights reserved.Item TiO2 nanosheet incorporated polysulfone ultrafiltration membranes for dye removal(Desalination Publications dwt@deswater.com, 2018) Nair, A.K.; Kumar, B.V.; Kalaiarasan, G.; JagadeeshBabu, J.B.Incorporation of nanomaterials in polymeric membranes is an effective means to improve membrane performance. In the present work, a novel additive TiO2 nanosheet was incorporated in polysulfone membrane. TiO2 nanosheets were synthesised by hydro-thermal method and blended with polysulfone to give nanocomposite membranes. The membranes performance was evaluated via pure water flux, bovine serum albumin rejection and anti fouling studies. Further the membranes were subjected to dye rejection application using Congo red and Rhodamine-B dyes. The membranes were characterised using scanning electron microscopy; X-ray diffraction and contact angle measurement. The nanocomposite membranes exhibited superior permeation, anti fouling and dye rejection traits. © 2018 Desalination Publications. All rights reserved.