Single and binary protein electroultrafiltration using poly(vinyl-alcohol)-carbon nanotube (PVA-CNT) composite membranes

AbstractElectrically conductive composite ultrafiltration membranes composed of carbon nanotubes have exhibited efficient fouling inhibition in wastewater treatment applications. In the current study, poly(vinyl-alcohol)-carbon nanotube membranes were applied to fed batch crossflow electroultrafiltration of dilute (0.1 g/L of each species) single and binary protein solutions of α-lactalbumin and hen egg-white lysozyme at pH 7.4, 4 mM ionic strength, and 1 psi. Electroultrafiltration using the poly(vinyl-alcohol)-carbon nanotube composite membranes yielded temporary enhancements in sieving for single protein filtration and in selectivity for binary protein separation compared to ultrafiltration using the unmodified PS-35 membranes. Assessment of membrane fouling based on permeate flux, zeta potential measurements, and scanning electron microscopy visualization of the conditioned membranes indicated significant resulting protein adsorption and aggregation which limited the duration of improvement during electroultrafiltration with an applied cathodic potential of −4.6 V (vs. Ag/AgCl). These results imply that appropriate optimization of electroultrafiltration using carbon nanotube-deposited polymeric membranes may provide substantial short-term improvements in binary protein separations.

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Single and binary protein electroultrafiltration using poly(vinyl-alcohol)-carbon nanotube (PVA-CNT) composite membranes

PLoS ONE ◽

10.1371/journal.pone.0228973 ◽

2020 ◽

Vol 15 (4) ◽

pp. e0228973

Author(s):

Raymond Yeung ◽

Xiaobo Zhu ◽

Terence Gee ◽

Ben Gheen ◽

David Jassby ◽

...

Keyword(s):

Carbon Nanotube ◽

Vinyl Alcohol ◽

Composite Membranes ◽

Poly Vinyl Alcohol

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Separation of Benzene/Cyclohexane Mixtures by Pervaporation Using Poly (Ethylene-Co-Vinylalcohol) and Carbon Nanotube-Filled Poly (Vinyl Alcohol-Co-Ethylene) Membranes

Separations ◽

10.3390/separations7040068 ◽

2020 ◽

Vol 7 (4) ◽

pp. 68

Author(s):

Hala Zahlan ◽

Waseem Sharaf Saeed ◽

Saad Alqahtani ◽

Taieb Aouak

Keyword(s):

Carbon Nanotube ◽

Separation Factor ◽

Vinyl Alcohol ◽

Azeotropic Mixture ◽

Poly Vinyl Alcohol ◽

Permeate Flux ◽

Scanning Calorimetry ◽

Absorption Area ◽

Poly Ethylene ◽

Pervaporation Separation

Poly(ethylene-co-vinylalcohol) (E-VOH) and carbon nanotube-filled poly (vinyl alcohol-co-ethylene) (E-VOH/CNT) were used as membranes to separate benzene/cyclohexane mixtures by pervaporation technique. To reach this goal, E-VOH and E-VOH/CNT membranes were prepared by solvent casting method and characterized by differential scanning calorimetry (DSC), thermogravimetry analysis (TGA), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The swelling tests were used to study the mass transfer of the benzene/cyclohexane mixture and their pure components. The separation by pervaporation process was carried out at 25 °C in which the effect of CNTs incorporated into E-VOH matrix and the initial concentration of benzene in the feed on the permeate flux, j, and separation factor, β, performance was investigated. The results obtained were very promising, in which the integration of CNTs through E-VOH chains increased the absorption area and raised the flux to 740 g/m2∙h. The separation factor increased to 9.03 and the pervaporation separation reached an index of 5942.2 g/m2∙h for the azeotropic mixture during 3 h of the separation process. In contrast, for the unfilled E-VOH membrane, it was found that these parameters were a rise of 280 g∙m−2∙h−1, separation factor of 12.90 and pervaporation separation index of 3332.0 g/m2∙h, under the same conditions. Likewise, the calculation of the performance of the E-VOH/CNT membrane with regard to that of the unfilled membrane indicated 2.64 for the total flux and 0.70 for the separation factor. It was also revealed that the best compromise of the filled membrane in terms of total cumulative flux and separation factor is obtained for the feed containing the azeotropic mixture.

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Fabrication and Properties of Poly(Ether Imide)/Poly(Vinyl Alcohol) Composite Ultrafiltration Membrane

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.531-532.18 ◽

2012 ◽

Vol 531-532 ◽

pp. 18-21 ◽

Cited By ~ 1

Author(s):

Watchanida Chinpa

Keyword(s):

Composite Membrane ◽

Membrane Fouling ◽

Vinyl Alcohol ◽

Pure Water ◽

Water Flux ◽

Composite Membranes ◽

Dip Coating ◽

Poly Vinyl Alcohol ◽

Phase Inversion Technique ◽

Pure Water Flux

A poly(ether imide) (PEI) composite membrane was prepared by dip coating a PEI membrane pretreated with 2-aminoethanole (AEOH) into an aqueous solution of poly(vinyl alcohol) PVA and glutaraldehyde (GA). PEI membrane support was firstly prepared via phase inversion technique by casting a solution of PEI in N-methylpyrrolidone (NMP), using water as non-solvent. The hydrophilicity, permeability, anti-fouling and mechanical properties of unmodified PEI and PEI/PVA composite membranes were investigated. By comparison with the unmodified PEI membrane, the PEI/PVA composite membrane exhibited a higher pure water flux and an increase in its hydrophilicity. In addition, the flux recovery of the pure water flux of the composite PEI membrane was higher than that of the unmodified PEI membrane. This indicated that the obtained composite membrane could reduce the membrane fouling and improve its use for ultrafiltration.

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Molecular dynamic simulation approach to understand the physical and proton transport properties of chitosan/sulfonated Poly(Vinyl alcohol) composite membranes

Polymer ◽

10.1016/j.polymer.2021.123458 ◽

2021 ◽

Vol 217 ◽

pp. 123458

Author(s):

Chun Yik Wong ◽

Wai Yin Wong ◽

Lijun Liu ◽

Yoji Shibutani ◽

Kee Shyuan Loh

Keyword(s):

Molecular Dynamic Simulation ◽

Molecular Dynamic ◽

Dynamic Simulation ◽

Vinyl Alcohol ◽

Proton Transport ◽

Composite Membranes ◽

Poly Vinyl Alcohol ◽

Simulation Approach ◽

Proton Transport Properties ◽

Sulfonated Poly

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Novel pH-Sensitive Poly(Vinyl Alcohol) Based Polyampholyte as Pervaporation Membrane

Materials Science Forum ◽

10.4028/www.scientific.net/msf.852.979 ◽

2016 ◽

Vol 852 ◽

pp. 979-983

Author(s):

Ping Rui Meng ◽

Liang Bo Li

Keyword(s):

Aqueous Solution ◽

Vinyl Alcohol ◽

Water Resistance ◽

Graft Copolymerization ◽

Sodium Acrylate ◽

Poly Vinyl Alcohol ◽

Permeate Flux ◽

Ft Ir ◽

Ethanol Aqueous Solution ◽

Poly Acrylamide

Sodium acrylate (NaAA) and acrylamide (AM) were grafted onto poly (vinyl alcohol) (PVA) using potassium persulfate as an initiator, Graft copolymerization namely poly (vinyl alcohol)-g-poly (acrylamide/sodium acrylate) (PVA-g-PAM/SAC). The poly (vinyl alcohol)-g-poly (vinylamine/sodium acrylate) (PVAMC) was prepraed by Hofmann rearrangement.The PVAMC homogeneous membrane was characterized by fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM).The water resistance of the PVAMC membranes is the best when pH of the PVAMC solutions was 4, at that time the numbers of-NH3+ and-COO- groups trended to be equal, so the isoelectric point was pH=4. At 90 °C the pervaporation of PVAMC composite membrane was tested and showed that the separation factor and the permeate flux were about 1001 and 1341 g/(m2·h) for 90wt% ethanol aqueous solution, and they were about 1297 and 1040 g/(m2·h) for 90wt% isopropanol aqueous solution.

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