scholarly journals Ultrafiltration of α-Lactalbumin Protein: Acquaintance of the Filtration Performance by Membrane Structure and Surface Alteration

Polymers ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3632
Author(s):  
Nasrul Arahman ◽  
Cut Meurah Rosnelly ◽  
Yusni Yusni ◽  
Afrillia Fahrina ◽  
Silmina Silmina ◽  
...  
Keyword(s):  
Membrane Surface ◽  
Pure Water ◽  
Multiple Roles ◽  
Pluronic F127 ◽  
Water Contact ◽  
Surface Alteration ◽  
Pressure Stabilization ◽  
Pes Membrane ◽  
Cell Inhibition ◽  
Better Than

α-Lactalbumin is an essential protein with multiple roles in physiological and the nutritional functionalities, such as diabetic prevention, blood pressure stabilization, and cancer cell inhibition. In the present work, polyethersulfone (PES)-based membranes were developed by incorporating Pluronic F127 and carbon nanotubes with single- and multi-walled dimensions (Sw-Cnts and Mw-Cnts) as additives. The resulting membranes were evaluated for use in the filtration of α-lactalbumin protein solution. Four series of membranes, including PES pristine membrane, were fabricated via the phase inversion process. The characteristics of the membrane samples were analyzed in terms of morphology, membrane surface hydrophilicity and roughness, and surface chemistry. The characterization results show that the incorporation of additive increased the surface wettability by reducing the surface water contact angle from 80.4° to 64.1° by adding F127 and Mw-Cnt additives. The highest pure water permeability of 135 L/(m2·h·bar) was also exhibited by the PES/F127/Mw-Cnt membrane. The performance of the modified membranes was clearly better than the pristine PSF for α-lactalbumin solution filtration. The permeability of α-lactalbumin solution increased from 9.0 L/(m2·h·bar) for the pristine PES membrane to 10.5, 11.0 and 11.5 L/(m2·h·bar) for membranes loaded with Pluronic F127, Sw-Cnts, and Mw-Cnts, respectively. Those increments corresponded to 17, 22, and 28%. Such increments could be achieved without altering the α-lactalbumin rejections of 80%. Remarkably, the rejection for the membrane loaded with Sw-Cnts even increased to 89%.

scholarly journals Synthesizing Ag/PDA/PES Antibacterial Membrane for Natural Organic Molecules Removal

2018 ◽  
Vol 65 ◽  
pp. 05023 ◽  
Author(s):  
Kok Poh Wai ◽  
Chai Hoon Koo ◽  
Yean Ling Pang ◽  
Woon Chan Chong ◽  
Woei Jye Lau
Keyword(s):  
Membrane Surface ◽  
Pure Water ◽  
Water Flux ◽  
X Ray Diffraction ◽  
X Ray ◽  
Membrane Performance ◽  
Dope Solution ◽  
And Performance ◽  
Pes Membrane ◽  
Contact Angle Analysis

Silver nanoparticles (NP) was successfully immobilized on polydopamine (PDA) supported polyethersulfone (PES) membrane via a redox reaction. Polyvinylpyrrolidone (PVP) was added into membrane dope solution as a pore-forming agent. Four pieces of membranes (M1, M2, M3 and M4) were fabricated with different active layer coatings to compare their morphological and performance properties. The differences between each sample were highlighted as follow: M1 (pristine PES), M2 (PES+PVP), M3 (PDA/PES+PVP) and M4 (Ag/PDA/PES+PVP). All membranes were characterized using scanning electron microscopy, energy dispersive X-ray spectroscopy, Fourier-transform infrared spectroscopy, X-ray diffraction and contact angle analysis. The membrane performance was examined using pure water permeability (PWP) test, antibacterial test and humic acid (HA) rejection test. Pristine M1 membrane showed that PWP of 27.16 LMH/bar and HA rejection of 84 %. In this study, it was found that the addition of PVP as a pore agent into the membrane M2 increased water flux but slightly deteriorated HA rejection. Coating of PDA on M3 and immobilizing silver NP on M4 membrane surface have improved HA rejection but compromised PWP. The results showed that membrane M4 carried excellent antibacterial property and highest HA rejection among all fabricated membranes.

scholarly journals Preparation and Characterization of Polysulfone Based Hollow Fibre Composite Membranes for Water Purification

2018 ◽  
Vol 22 (2) ◽  
Author(s):  
A. M. Vijesh ◽  
P. C. Shyma ◽  
V. Prakash ◽  
B. Garudachari
Keyword(s):  
Fibre Composite ◽  
Membrane Surface ◽  
Pure Water ◽  
Water Flux ◽  
Composite Membranes ◽  
Hollow Fibre ◽  
Water Contact ◽  
Cross Flow Filtration ◽  
Phase Inversion Technique ◽  
Pure Water Flux

Nanofiltration membranes are gaining more importance in the field of water treatment especially in desalination plants. Hollow fibre membranes have been preferred over other membrane configurations due to their high membrane surface area to module volume, mechanical property and easy handling. In the present work, we prepared new type of polysulfone (PSf) composite hollow fibre membranes by blending PSf with polyvinylpyrrolidinone-nitrobenzene (PVPD) in different compositions. New membranes were fabricated using wet-jet phase inversion technique. The resultant composite membranes were characterized by various analytical techniques such as water contact angle, SEM, DSC, TG. Pure water flux of the membranes was measured using cross-flow filtration techniques. The study revealed that increased composition of PVPD in casting solution resulted in a highly porous membrane structure and the pure water flux of the membranes increases in the same order.

scholarly journals Karakterisasi dan Kinerja Membran Polyethersulfone Termodifikasi Aditif Anorganik secara Blending Polimer

2021 ◽  
Vol 6 (4) ◽  
Author(s):  
Umi Fathanah ◽  
Hesti Meilina
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Membrane Surface ◽  
Scale Up ◽  
Hydroxyl Group ◽  
Water Contact ◽  
Dimethyl Acetamide ◽  
Phase Inversion Technique ◽  
And Performance ◽  
Pes Membrane

Recently, membrane technology has developed rapidly as a process for water treatment. The membrane process is in demand due to several advantages including being able to work at low temperatures, easier to operate and easy to scale up. Magnesium hydroxide (Mg(OH)2) is an inorganic compound that is inexpensive, non-toxic and hydrophilic, so it has the potential to be used as an additive in membrane fabrication. This study aims to determine the characteristics and performance (permeability and selectivity) of Polyethersulfone (PES) membrane modified with Mg(OH)2, using dimethyl Acetamide (DMAc) as solvent. The membrane was made by blending polymer with phase inversion technique and the characterization carried out included membrane morphological tests, functional group tests, water contact angle tests and evaluating membrane performance by measuring membrane selectivity and permeability. The results showed that the hydroxyl group contained in Mg(OH)2 was able to increase the hydrophilicity which was indicated by a decrease in the water contact angle on the modified membrane to 65o. The Mg(OH)2 additive acts as a pore-forming agent which can be seen in the changes in membrane morphology on the cross-section of the membrane surface. The performance of the membrane resulted in an increase in membrane permeability of 51 L/m2.hour.bar with humid acid rejection of 63%.

scholarly journals Embedded three spinel ferrite nanoparticles in PES-based nano filtration membranes with enhanced separation properties

2021 ◽  
Vol 45 (1) ◽  
pp. 1-10
Author(s):  
Davood Ghanbari ◽  
Samaneh BandehAli ◽  
Abdolreza Moghadassi
Keyword(s):  
Metal Removal ◽  
Membrane Surface ◽  
Pure Water ◽  
Spinel Ferrite ◽  
Heavy Metal Removal ◽  
Water Flux ◽  
Ferrite Nanoparticles ◽  
X Ray Diffraction ◽  
Filtration Membranes ◽  
Pes Membrane

Abstract In this study, three types of ferrites nanoparticles including CoFe2O4, NiFe2O4, and ZnFe2O4 were synthesized by microwave-assisted hydrothermal method. The X-ray diffraction analysis (XRD), Fourier transform infrared spectroscopy (FTIR), and field emission scanning electron microscopy (FESEM) were employed to analyze synthesized nanoparticles and fabricated membranes. The morphology of membrane surface was investigated by surface images. The ability of ferrite nanoparticles was evaluated to the separation of sodium salt and heavy metals such as Cr2+, Pb2+, and Cu2+ from aqueous solutions. The modified membrane showed the enhancement of membrane surface hydrophilicity, porosity, and mean pore size. The results revealed a significant increase in pure water flux: 152.27, 178, and 172.68 L·m−2·h−1 for PES/0.001 wt% of CoFe2O4, PES/0.001 wt% NiFe2O4, and PES/0.001 wt% ZnFe2O4 NPs, respectively. Moreover, Na2SO4 rejection was reached 78% at 0.1 wt% of CoFe2O4 NPs. The highest Cr (II) rejection obtained 72% for PES/0.001 wt% of NiFe2O4 NPs while it was 46% for the neat PES membrane. The Pb(II) rejection reached above 75% at 0.1 wt% of CoFe2O4 NPs. The Cu(II) rejection was obtained 75% at 0.1 wt% of CoFe2O4 NPs. The ferrite NPs revealed the high potential of heavy metal removal in the filtration membranes.

Preparation of Polyethersulfone Ultrafiltration Membrane Surface Coated with TiO2 Nanoparticles and Irradiated under UV Light

2013 ◽  
Vol 594-595 ◽  
pp. 877-881 ◽  
Author(s):  
Siti Hawa Mohamad ◽  
M.I. Idris ◽  
Hasan Zuhudi Abdullah
Keyword(s):  
Humic Acid ◽  
Uv Light ◽  
Membrane Surface ◽  
Pure Water ◽  
Water Flux ◽  
Dip Coating ◽  
Ultrafiltration Membrane ◽  
Inversion Method ◽  
Pes Membrane ◽  
Coated Membrane

This paper focuses on performance of polyethersulfone (PES) ultrafiltration membrane coated with titanium dioxide (TiO2) nanoparticles and irradiated with UV light. The flat sheet membrane was prepared via phase inversion method, with two types of membrane; TiO2 coated PES membrane and UV irradiated TiO2 coated PES membrane. TiO2 suspension with concentration of 0.01, 0.03 and 0.05 wt.% were prepared and coated on the PES surface via dip coating. Membrane was immersed in all suspension for 15 minutes and 30 minutes. Then, prepared coated membranes were irradiated by 184 Watts UV lamp for 15 minutes. The performance of membranes was examined by permeation of humic acid. The morphology of membranes was analyzed by scanning electron microscopy (SEM). It was revealed that the pure water flux and humic acid permeation of UV irradiated TiO2 coated membrane was higher than TiO2 coated membrane. It can be concluded that TiO2 coated with 0.03 wt.% of suspension, 30 minutes and 15 minutes UV irradiation with 184 Watt light were determined as the optimum conditions for preparation ultrafiltration PES membrane.

Preparation and Properties of Poly(ether imide) Ultrafiltration Membrane Modified with Polyether Diamine

2014 ◽  
Vol 931-932 ◽  
pp. 63-67 ◽  
Author(s):  
Pattama Phomdum ◽  
Watchanida Chinpa
Keyword(s):  
Membrane Surface ◽  
Pure Water ◽  
Water Flux ◽  
Skin Layer ◽  
Recovery Ratio ◽  
Water Contact ◽  
Pure Water Flux ◽  
Modified Membrane ◽  
Bsa Rejection ◽  
Scanning Electron

In this study, the morphologies, the hydrophilicity, and the anti-fouling of poly (ether imide) (PEI) membrane modified with an aqueous solution of polyether diamine predominantly PEO backbone (PEO-diamine) were investigated. A decrease in water contact angle and an increase in water absorption ratio indicated the hydrophilicity of modified membrane. Scanning Electron Microscope (SEM) showed a thinner skin layer of membrane and pores on the membrane surface for modified PEI membrane providing an increment of pure water flux and a reduction of BSA rejection of membrane. Under the protein filtration study, it was found that the flux recovery ratio of modified PEI membrane was higher than that of the unmodified PEI membrane.

Fabrication and Properties of the PVDF/PVDF-g-PMMA Blend Hydrophilic Membrane

2011 ◽  
Vol 418-420 ◽  
pp. 639-642
Author(s):  
Tao Yuan ◽  
Jian Qiang Meng ◽  
Guo Rong Cai ◽  
Yu Feng Zhang
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Polyvinylidene Fluoride ◽  
Membrane Surface ◽  
Pure Water ◽  
Water Flux ◽  
Water Contact ◽  
H Nmr ◽  
Membrane Surfaces ◽  
Static Water

An amphiphilic graft copolymer was obtained via atom transfer radical polymerization (ATRP) of methacrylate (MMA) initiated directly by polyvinylidene fluoride (PVDF). Hydrophilic PVDF membranes were prepared by immersion precipitation of PVDF-g-PMMA and PVDF blend solutions. The chemical structure and the molecular weight were characterized by 1H-NMR and GPC. The hydrophilicity of membrane surfaces were characterized by static water contact angle. Top surface and cross-section of membranes were observed by Field Emission Scanning Electron Microscope (FESEM). The results demonstrated the water contact angle of the membrane surface decreased from 89°to 67°, indicating enhanced hydrophilicity; the pure water flux water firstly decreased and then increased up to 1.7 times of the PVDF membrane. The retention of PEG (Mn=6000) could be maintained at 93%-95%.

Fabrication and Characterization of Copper-Chelated Polyethersulfone/Polydopamine Microfiltration Membrane for Antifouling Applications

2021 ◽  
Vol 878 ◽  
pp. 23-27
Author(s):  
Xech Rafael Aldrei U. Dela Paz ◽  
Rhoda B. Leron
Keyword(s):  
Cell Structure ◽  
Pure Water ◽  
Water Flux ◽  
Antibacterial Properties ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Water Contact ◽  
Hydrophilic Character ◽  
Pure Water Flux ◽  
Pes Membrane

In this work, we investigated the applicability of polyethersulfone/polydopamine/copper (II) (PES/PDA/Cu2+) membrane composite in microfiltration. Pristine PES membrane was prepared via non-induced phase separation (NIPS), and the surface was modified by coating with PDA and deposition of Cu (II) to enhance its physical and antibacterial properties. The membrane was characterized using energy-dispersive X-ray spectroscopy, scanning electron microscopy and water contact angle measurement. The hydrophilic character of the PES membrane significantly increased and the mechanical properties were greatly improved. Results showed that the porosity of the membrane was affected by the concentration of the polymer in the casting solution, and the membrane was suitable for filtration application due to its open-cell structure. Pure water flux was enhanced upon surface modification implying that hydrophilicity has more influence on the flux than the shrinking of the pore size. The antibacterial assay suggested that the membranes possess antibacterial property.

Preparation and characterization of poly(ether sulfone)/fluorinated silica organic–inorganic composite membrane for sulfur dioxide desulfurization

2018 ◽  
Vol 31 (1) ◽  
pp. 72-85 ◽  
Author(s):  
Ying-Na Li ◽  
Han Li ◽  
Hui Ye ◽  
Yu-Zhong Zhang ◽  
Ying Chen
Keyword(s):  
Sulfur Dioxide ◽  
Composite Membrane ◽  
Photoelectron Spectroscopy ◽  
Membrane Surface ◽  
Gravimetric Analysis ◽  
Inorganic Layer ◽  
Water Contact ◽  
Time Operation ◽  
Pes Membrane ◽  
Inorganic Composite

The highly hydrophobic poly(ether sulfone)/fluorinated silica (PES/fSiO2) organic–inorganic composite membrane for sulfur dioxide (SO2) desulfurization was prepared by incorporating the fSiO2 particles on the PES membrane via sol–gel process and fluorination. The formation of PES/fSiO2 organic–inorganic composite membrane was examined by attenuated total reflectance Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, thermal gravimetric analysis, field-emission scanning electron microscopy, and water contact angle. The experimental results showed that the fSiO2 inorganic layer was tightly bonded to the PES membrane surface through silane chemical reactions. The incorporation of the fSiO2 inorganic layer on the PES membrane surface increases the surface roughness and reduces the surface free energy because of the hydrophobic dodecafluoroheptyl-propyl-trimethoxysilane. The hydrophobicity of the PES/fSiO2 composite membrane was dramatically enhanced from 78.0° of PES membrane to 128.2° of PES/fSiO2 membrane. Compared with PES membrane, the desulfurization performance of PES/fSiO2 membrane was investigated. PES/fSiO2 organic–inorganic composite membrane indicated a reasonably stable SO2 absorption flux of 7.69E-4 mol/m2 s during the 240-min-long time operation.

scholarly journals Rapid Surface Modification of Ultrafiltration Membranes for Enhanced Antifouling Properties

Membranes ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 401
Author(s):  
Noresah Said ◽  
Ying Siew Khoo ◽  
Woei Jye Lau ◽  
Mehmet Gürsoy ◽  
Mustafa Karaman ◽  
...  
Keyword(s):  
Surface Modification ◽  
Deposition Time ◽  
Plasma Deposition ◽  
Membrane Surface ◽  
Pure Water ◽  
Plasma Modification ◽  
Surface Hydrophilicity ◽  
Water Cleaning ◽  
Modification Method ◽  
Modified Membrane

In this work, several ultrafiltration (UF) membranes with enhanced antifouling properties were fabricated using a rapid and green surface modification method that was based on the plasma-enhanced chemical vapor deposition (PECVD). Two types of hydrophilic monomers—acrylic acid (AA) and 2-hydroxyethyl methacrylate (HEMA) were, respectively, deposited on the surface of a commercial UF membrane and the effects of plasma deposition time (i.e., 15 s, 30 s, 60 s, and 90 s) on the surface properties of the membrane were investigated. The modified membranes were then subjected to filtration using 2000 mg/L pepsin and bovine serum albumin (BSA) solutions as feed. Microscopic and spectroscopic analyses confirmed the successful deposition of AA and HEMA on the membrane surface and the decrease in water contact angle with increasing plasma deposition time strongly indicated the increase in surface hydrophilicity due to the considerable enrichment of the hydrophilic segment of AA and HEMA on the membrane surface. However, a prolonged plasma deposition time (>15 s) should be avoided as it led to the formation of a thicker coating layer that significantly reduced the membrane pure water flux with no significant change in the solute rejection rate. Upon 15-s plasma deposition, the AA-modified membrane recorded the pepsin and BSA rejections of 83.9% and 97.5%, respectively, while the HEMA-modified membrane rejected at least 98.5% for both pepsin and BSA. Compared to the control membrane, the AA-modified and HEMA-modified membranes also showed a lower degree of flux decline and better flux recovery rate (>90%), suggesting that the membrane antifouling properties were improved and most of the fouling was reversible and could be removed via simple water cleaning process. We demonstrated in this work that the PECVD technique is a promising surface modification method that could be employed to rapidly improve membrane surface hydrophilicity (15 s) for the enhanced protein purification process without using any organic solvent during the plasma modification process.

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