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Vahid Vatanpour - One of the best experts on this subject based on the ideXlab platform.
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magnetic field augmented Coagulation Bath during phase inversion for preparation of znfe2o4 sio2 pes nanofiltration membrane a novel method for flux enhancement and fouling resistance
Journal of Industrial and Engineering Chemistry, 2017Co-Authors: Sirus Zinadini, Ali Akbar Zinatizadeh, Masoud Rahimi, Vahid VatanpourAbstract:Abstract Nanocomposite polyethersulfone (PES) nanofiltration membranes were prepared using self-synthesized magnetic ZnFe2O4/SiO2 nanofiller by the phase inversion method. The main aim of this paper was to investigate effect of magnetic field in Coagulation step on characteristics of the prepared membranes. The performance of the fabricated mixed matrix membranes was studied by measuring pure water flux, salt retention and fouling parameters. As a result, Coagulation Bath under magnetic field significantly enhanced pure water flux of the membranes from about 12 kg/m2 h (without magnetic field) to 38 kg/m2 h in the presence of 1 wt.% ZnFe2O4/SiO2 nanoparticles. This described by amount of magnetic nanofillers on the membrane morphology coagulated under the magnetic field of 0.1 T, which changed the skin-layer structure. EDX mapping showed that the magnetic nanoparticles migrated to the membrane surface, when the membrane coagulated under magnetic field. The water contact angle measurement showed the excellent hydrophilicity of 0.5 wt.% ZnFe2O4/SiO2 embedded membranes under magnetic field, which resulted in the superior antifouling properties against powder milk solution. The salt retention sequence for 0.5 wt.% nanoparticle under magnetic field was in sequence of R (Na2SO4) > R (MgSO4) > R (NaCl).
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magnetic field augmented Coagulation Bath during phase inversion for preparation of znfe2o4 sio2 pes nanofiltration membrane a novel method for flux enhancement and fouling resistance
Journal of Industrial and Engineering Chemistry, 2017Co-Authors: Sirus Zinadini, Ali Akbar Zinatizadeh, Masoud Rahimi, Vahid VatanpourAbstract:Abstract Nanocomposite polyethersulfone (PES) nanofiltration membranes were prepared using self-synthesized magnetic ZnFe2O4/SiO2 nanofiller by the phase inversion method. The main aim of this paper was to investigate effect of magnetic field in Coagulation step on characteristics of the prepared membranes. The performance of the fabricated mixed matrix membranes was studied by measuring pure water flux, salt retention and fouling parameters. As a result, Coagulation Bath under magnetic field significantly enhanced pure water flux of the membranes from about 12 kg/m2 h (without magnetic field) to 38 kg/m2 h in the presence of 1 wt.% ZnFe2O4/SiO2 nanoparticles. This described by amount of magnetic nanofillers on the membrane morphology coagulated under the magnetic field of 0.1 T, which changed the skin-layer structure. EDX mapping showed that the magnetic nanoparticles migrated to the membrane surface, when the membrane coagulated under magnetic field. The water contact angle measurement showed the excellent hydrophilicity of 0.5 wt.% ZnFe2O4/SiO2 embedded membranes under magnetic field, which resulted in the superior antifouling properties against powder milk solution. The salt retention sequence for 0.5 wt.% nanoparticle under magnetic field was in sequence of R (Na2SO4) > R (MgSO4) > R (NaCl).
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fouling reduction of emulsion polyvinylchloride ultrafiltration membranes blended by peg the effect of additive concentration and Coagulation Bath temperature
Desalination and Water Treatment, 2016Co-Authors: Mohammad Hossein Davood Abadi Farahani, Hesamoddin Rabiee, Vahid Vatanpour, Seyed Mehdi BorgheiAbstract:AbstractIn the present work, ultrafiltration membranes were prepared using emulsion polyvinyl chloride (EPVC) with the addition of various concentrations of polyethylene glycol (PEG) to investigate the morphological structure and separation properties. The effects of polymer concentration, Coagulation Bath temperature (CBT), and PEG (6 kDa) concentrations—a pore former hydrophilic additive—were studied. Through the phase inversion, the membranes—which were induced by immersion precipitation in a water Coagulation Bath—were fabricated through dissolving EPVC in N-methyl-pyrrolidinone, a polymer solvent. Morphological features of the membranes were characterized through scanning electron microscopy, pore size and porosity, and contact angle measurements. Water and bovine serum albumin (BSA) were used in order to study the separation and permeation performance of the fabricated membranes at 3 bar, which is operating pressure. The results which were obtained from contact angle test indicated an increment in t...
Sirus Zinadini - One of the best experts on this subject based on the ideXlab platform.
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magnetic field augmented Coagulation Bath during phase inversion for preparation of znfe2o4 sio2 pes nanofiltration membrane a novel method for flux enhancement and fouling resistance
Journal of Industrial and Engineering Chemistry, 2017Co-Authors: Sirus Zinadini, Ali Akbar Zinatizadeh, Masoud Rahimi, Vahid VatanpourAbstract:Abstract Nanocomposite polyethersulfone (PES) nanofiltration membranes were prepared using self-synthesized magnetic ZnFe2O4/SiO2 nanofiller by the phase inversion method. The main aim of this paper was to investigate effect of magnetic field in Coagulation step on characteristics of the prepared membranes. The performance of the fabricated mixed matrix membranes was studied by measuring pure water flux, salt retention and fouling parameters. As a result, Coagulation Bath under magnetic field significantly enhanced pure water flux of the membranes from about 12 kg/m2 h (without magnetic field) to 38 kg/m2 h in the presence of 1 wt.% ZnFe2O4/SiO2 nanoparticles. This described by amount of magnetic nanofillers on the membrane morphology coagulated under the magnetic field of 0.1 T, which changed the skin-layer structure. EDX mapping showed that the magnetic nanoparticles migrated to the membrane surface, when the membrane coagulated under magnetic field. The water contact angle measurement showed the excellent hydrophilicity of 0.5 wt.% ZnFe2O4/SiO2 embedded membranes under magnetic field, which resulted in the superior antifouling properties against powder milk solution. The salt retention sequence for 0.5 wt.% nanoparticle under magnetic field was in sequence of R (Na2SO4) > R (MgSO4) > R (NaCl).
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magnetic field augmented Coagulation Bath during phase inversion for preparation of znfe2o4 sio2 pes nanofiltration membrane a novel method for flux enhancement and fouling resistance
Journal of Industrial and Engineering Chemistry, 2017Co-Authors: Sirus Zinadini, Ali Akbar Zinatizadeh, Masoud Rahimi, Vahid VatanpourAbstract:Abstract Nanocomposite polyethersulfone (PES) nanofiltration membranes were prepared using self-synthesized magnetic ZnFe2O4/SiO2 nanofiller by the phase inversion method. The main aim of this paper was to investigate effect of magnetic field in Coagulation step on characteristics of the prepared membranes. The performance of the fabricated mixed matrix membranes was studied by measuring pure water flux, salt retention and fouling parameters. As a result, Coagulation Bath under magnetic field significantly enhanced pure water flux of the membranes from about 12 kg/m2 h (without magnetic field) to 38 kg/m2 h in the presence of 1 wt.% ZnFe2O4/SiO2 nanoparticles. This described by amount of magnetic nanofillers on the membrane morphology coagulated under the magnetic field of 0.1 T, which changed the skin-layer structure. EDX mapping showed that the magnetic nanoparticles migrated to the membrane surface, when the membrane coagulated under magnetic field. The water contact angle measurement showed the excellent hydrophilicity of 0.5 wt.% ZnFe2O4/SiO2 embedded membranes under magnetic field, which resulted in the superior antifouling properties against powder milk solution. The salt retention sequence for 0.5 wt.% nanoparticle under magnetic field was in sequence of R (Na2SO4) > R (MgSO4) > R (NaCl).
W K W Ramli - One of the best experts on this subject based on the ideXlab platform.
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hydrophobic pvdf membrane via two stage soft Coagulation Bath system for membrane gas absorption of co2
Separation and Purification Technology, 2013Co-Authors: A L Ahmad, W K W RamliAbstract:Abstract Hydrophobic PVDF membranes have been prepared through a two-stage/dual soft Coagulation Bath system. The prepared membranes exhibited improved hydrophobicity properties, where the contact angle values were increased, with higher efficiency of CO 2 removal. Membrane prepared with two-stage Coagulation Bath system of 100 wt.% ethanol and 80 wt.% of NMP in water Bath exhibited high water contact angle of 127°, high porosity of approximately 89% with small and narrower pore distribution. The membranes were tested in Membrane Gas Absorption (MGA) system with recorded CO 2 removal efficiency of 85% for 3 h and lasted for about 10 straight hours with higher flux and 65% efficiency of CO 2 removal. The modified membranes have been characterized by contact angle, microstructure, maximum pore size ( P Rmax ) and its distribution, surface roughness, membrane porosity and performances in MGA system. By increasing the polymer concentration, the morphology of the prepared membranes is improved due to the smaller pore characteristics and porous structure formed. The macrovoid structures severely formed in membrane with higher thickness which caused the low porosity and contact angle of the membrane.
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effect of ethanol concentration in water Coagulation Bath on pore geometry of pvdf membrane for membrane gas absorption application in co2 removal
Separation and Purification Technology, 2012Co-Authors: A L Ahmad, W K W Ramli, W J N Fernando, Wan Ramli Wan DaudAbstract:Abstract In this study, polyvinylidenefluoride (PVDF) flat sheet membranes were fabricated by immersing into various concentrations of ethanol in water (M-1:0%, M-2:25%, M-3:50% and M-4:75% respectively) as the Coagulation Bath via a non-solvent induced phase-inversion (NIPS) method. It was observed that the presence of ethanol affected the properties of the membranes. Low concentration of ethanol improved the hydrophobicity of the membranes. It also caused the formation of smaller pore size with more uniform, narrower pore distribution. Hydrophobicity of the fabricated membranes increased when the concentration of ethanol was raised. The absorption of carbon dioxide, CO 2 in 2-amino-2-methyl-1-propanol (AMP), 1 M was also studied in a Membrane Gas Absorption (MGA) system where membranes M-2 and M-4 had better mass transfer and higher CO 2 fluxes. CO 2 removal efficiency, η generally decreased with time for all membranes and had the highest value for M-2. The increasing trend of CO 2 removal efficiency for all membranes was as follows: M-1
A L Ahmad - One of the best experts on this subject based on the ideXlab platform.
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hydrophobic pvdf membrane via two stage soft Coagulation Bath system for membrane gas absorption of co2
Separation and Purification Technology, 2013Co-Authors: A L Ahmad, W K W RamliAbstract:Abstract Hydrophobic PVDF membranes have been prepared through a two-stage/dual soft Coagulation Bath system. The prepared membranes exhibited improved hydrophobicity properties, where the contact angle values were increased, with higher efficiency of CO 2 removal. Membrane prepared with two-stage Coagulation Bath system of 100 wt.% ethanol and 80 wt.% of NMP in water Bath exhibited high water contact angle of 127°, high porosity of approximately 89% with small and narrower pore distribution. The membranes were tested in Membrane Gas Absorption (MGA) system with recorded CO 2 removal efficiency of 85% for 3 h and lasted for about 10 straight hours with higher flux and 65% efficiency of CO 2 removal. The modified membranes have been characterized by contact angle, microstructure, maximum pore size ( P Rmax ) and its distribution, surface roughness, membrane porosity and performances in MGA system. By increasing the polymer concentration, the morphology of the prepared membranes is improved due to the smaller pore characteristics and porous structure formed. The macrovoid structures severely formed in membrane with higher thickness which caused the low porosity and contact angle of the membrane.
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preparation of polyvinylidene fluoride membrane via dual Coagulation Bath system and its wettability study
Journal of Applied Polymer Science, 2012Co-Authors: Boon S Ooi, N S M Yatim, A L Ahmad, S O LaiAbstract:Hydrophobic polyvinylidene fluoride (PVDF) membrane has been successfully developed using dual Coagulation Bath system in which first Coagulation Bath produced membrane with nodular structure whereas second water Coagulation Bath provided membrane with porous structure. The effects of Coagulation time, polymer concentration, and isopropanol/water ratio in first Coagulation Bath on membrane wettability were studied. The membrane surface morphology such as pore size and porosity were studied using field emission scanning electron microscope and porosimeter. The wettability of the membrane was determined using sessile drop contact angle measurement. Using dual-Coagulation Bath system, it was found that membrane with bicontinuous structure tends to have higher water contact angles. This membrane could be produced through short immersion time of 18 wt % PVDF solution in soft nonsolvent Bath followed by Coagulation in water nonsolvent Bath. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
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preparation and characterization of pvdf tio2 mixed matrix membrane via in situ colloidal precipitation method
Desalination, 2012Co-Authors: Yeit Haan Teow, A L Ahmad, Jitkang Lim, Boon S OoiAbstract:Abstract In this study, titanium dioxide (TiO2) nanoparticles (NPs) were incorporated into polyvinylidene fluoride (PVDF) membrane to produce a mixed matrix membrane via phase inversion and colloidal precipitation method. In order to avoid agglomeration and to maintain the stability of NPs in the Coagulation Bath, NPs were dispersed in the Bath via sonication and peptization. The membrane surface morphology and distribution pattern of NPs on the membrane surface were observed by field emission scanning electron microscopy. It was found that the NP size and distribution of NPs on the membrane surface were affected to a very great extent by the type of solvent used in the dope formulation and concentration of TiO2 in the Coagulation Bath. Membrane prepared using N-methyl-2-pyrrolidone (NMP) as solvent has smaller surface particles and narrower particle size distribution compared to N-N-dimethylacetamide (DMAc) and N,N-dimethyl formamide (DMF) due to the hydrophobic/hydrophilic interactions between NPs and polymer solution. However, the pore size of membrane prepared using NMP was relatively big, thus resulted in poorer humic acid (HA) rejection. PVDF/TiO2 mixed matrix membrane using DMAc as solvent with 0.01 g/L of TiO2 in the Coagulation Bath exhibited extraordinary permeability (43.21 L/m2 h) with superior retention properties (98.28%) of humic acid.
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effect of ethanol concentration in water Coagulation Bath on pore geometry of pvdf membrane for membrane gas absorption application in co2 removal
Separation and Purification Technology, 2012Co-Authors: A L Ahmad, W K W Ramli, W J N Fernando, Wan Ramli Wan DaudAbstract:Abstract In this study, polyvinylidenefluoride (PVDF) flat sheet membranes were fabricated by immersing into various concentrations of ethanol in water (M-1:0%, M-2:25%, M-3:50% and M-4:75% respectively) as the Coagulation Bath via a non-solvent induced phase-inversion (NIPS) method. It was observed that the presence of ethanol affected the properties of the membranes. Low concentration of ethanol improved the hydrophobicity of the membranes. It also caused the formation of smaller pore size with more uniform, narrower pore distribution. Hydrophobicity of the fabricated membranes increased when the concentration of ethanol was raised. The absorption of carbon dioxide, CO 2 in 2-amino-2-methyl-1-propanol (AMP), 1 M was also studied in a Membrane Gas Absorption (MGA) system where membranes M-2 and M-4 had better mass transfer and higher CO 2 fluxes. CO 2 removal efficiency, η generally decreased with time for all membranes and had the highest value for M-2. The increasing trend of CO 2 removal efficiency for all membranes was as follows: M-1
Ali Akbar Zinatizadeh - One of the best experts on this subject based on the ideXlab platform.
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magnetic field augmented Coagulation Bath during phase inversion for preparation of znfe2o4 sio2 pes nanofiltration membrane a novel method for flux enhancement and fouling resistance
Journal of Industrial and Engineering Chemistry, 2017Co-Authors: Sirus Zinadini, Ali Akbar Zinatizadeh, Masoud Rahimi, Vahid VatanpourAbstract:Abstract Nanocomposite polyethersulfone (PES) nanofiltration membranes were prepared using self-synthesized magnetic ZnFe2O4/SiO2 nanofiller by the phase inversion method. The main aim of this paper was to investigate effect of magnetic field in Coagulation step on characteristics of the prepared membranes. The performance of the fabricated mixed matrix membranes was studied by measuring pure water flux, salt retention and fouling parameters. As a result, Coagulation Bath under magnetic field significantly enhanced pure water flux of the membranes from about 12 kg/m2 h (without magnetic field) to 38 kg/m2 h in the presence of 1 wt.% ZnFe2O4/SiO2 nanoparticles. This described by amount of magnetic nanofillers on the membrane morphology coagulated under the magnetic field of 0.1 T, which changed the skin-layer structure. EDX mapping showed that the magnetic nanoparticles migrated to the membrane surface, when the membrane coagulated under magnetic field. The water contact angle measurement showed the excellent hydrophilicity of 0.5 wt.% ZnFe2O4/SiO2 embedded membranes under magnetic field, which resulted in the superior antifouling properties against powder milk solution. The salt retention sequence for 0.5 wt.% nanoparticle under magnetic field was in sequence of R (Na2SO4) > R (MgSO4) > R (NaCl).
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magnetic field augmented Coagulation Bath during phase inversion for preparation of znfe2o4 sio2 pes nanofiltration membrane a novel method for flux enhancement and fouling resistance
Journal of Industrial and Engineering Chemistry, 2017Co-Authors: Sirus Zinadini, Ali Akbar Zinatizadeh, Masoud Rahimi, Vahid VatanpourAbstract:Abstract Nanocomposite polyethersulfone (PES) nanofiltration membranes were prepared using self-synthesized magnetic ZnFe2O4/SiO2 nanofiller by the phase inversion method. The main aim of this paper was to investigate effect of magnetic field in Coagulation step on characteristics of the prepared membranes. The performance of the fabricated mixed matrix membranes was studied by measuring pure water flux, salt retention and fouling parameters. As a result, Coagulation Bath under magnetic field significantly enhanced pure water flux of the membranes from about 12 kg/m2 h (without magnetic field) to 38 kg/m2 h in the presence of 1 wt.% ZnFe2O4/SiO2 nanoparticles. This described by amount of magnetic nanofillers on the membrane morphology coagulated under the magnetic field of 0.1 T, which changed the skin-layer structure. EDX mapping showed that the magnetic nanoparticles migrated to the membrane surface, when the membrane coagulated under magnetic field. The water contact angle measurement showed the excellent hydrophilicity of 0.5 wt.% ZnFe2O4/SiO2 embedded membranes under magnetic field, which resulted in the superior antifouling properties against powder milk solution. The salt retention sequence for 0.5 wt.% nanoparticle under magnetic field was in sequence of R (Na2SO4) > R (MgSO4) > R (NaCl).