Performance evaluation of polyvinylchloride/polyacrylonitrile ultrafiltration blend membrane

Pakbaz, Mojgan; Maghsoud, Zahra

doi:10.1007/s13726-017-0568-3

Cited by 24 publications

(8 citation statements)

References 41 publications

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“…As shown in the FTIR spectrum of the polyacrylonitrile membrane obtained from the pure water coagulation bath, the peaks at 2243 and 1737 cm −1 are related to the stretching vibration of nitrile (CN) and carbonyl (CO) groups in the acrylonitrile and vinyl acetate monomers, respectively . The peaks at 1452 cm −1 and 2938 cm −1 are due to the CH bending and stretching in CH 2 , respectively .…”

Section: Resultsmentioning

confidence: 94%

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Enhanced modification technique for polyacrylonitrile UF membranes by direct hydrolysis in the immersion bath

Cheraghali

Maghsoud

2019

J of Applied Polymer Sci

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Conventional hydrolysis modification of polyacrylonitrile (PAN) membranes is usually carried out in a post-treatment step during which hydrophilic groups are created on the membrane surface. In this article, however, direct hydrolysis in the immersion bath is proposed as a new and simple approach for simultaneous membrane preparation and modification. The main advantages of this method include lower alkali concentrations, promptness, and the lack of need for elevating temperature compared to other studies. The cast films were immersed in the coagulation bath containing aqueous NaOH solutions of various concentrations (0.003, 0.0125, 0.025, 0.05, and 0.1 M) for 1, 3, 5, and 10 min, which were then transferred to a bath of pure water. Membranes were characterized by pure water flux, porosity, average pore diameter, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), atomic force microscopy (AFM), contact angle, mechanical properties, rejection, and flux recovery ratio (FRR) measurements. At all treatment times, the pure water flux of modified membranes reached its maximum at low NaOH concentrations with a substantial increase (210%) in the membrane treated with 0.0125 M NaOH for 1 min. Furthermore, the kinetics of the hydrolysis reaction was considered to provide deeper insights into morphological changes occurring during the hydrolysis.

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Section: Resultsmentioning

confidence: 94%

“…Table draws a comparison between the performance of the hydrolyzed PAN membranes prepared in this work and other articles. In most studies, the pure flux has been reported to decline after hydrolysis with the exception of Refs . in which flux enhancement after hydrolysis has been reported.…”

Section: Resultsmentioning

confidence: 99%

Enhanced modification technique for polyacrylonitrile UF membranes by direct hydrolysis in the immersion bath

Cheraghali

Maghsoud

2019

J of Applied Polymer Sci

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“…Figure 4 demonstrates the FTIR spectra analysis of initial (PAN-1) and modified (PAN-2) membranes, the intensities of some peaks have changed, implying that the chemical structure of porous FO membranes get changed after the alkali treatment. 28,29 For hydrolyzed membranes, the broad absorption band at 3391 cm À1 can be assigned to the stretching vibration of OH groups in the carboxyl and NH 2 groups at the amide structure. 30 The peak of PAN-2 at 1737 cm À1 , corresponding to the C O stretching vibration of the carboxylic group, is relatively higher than that of PAN-1 membrane.…”

Section: Characterizations Of Porous Fo Membranementioning

confidence: 99%

The applications of porous FO membranes and polyelectrolyte draw solution in the high‐salinity organic wastewater treatment with a hybrid forward osmosis‐membrane distillation system

Cao

Zhu

2022

J of Applied Polymer Sci

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Hybrid forward osmosis-membrane distillation (FO-MD) system have been considered as a promising technology for wastewater treatment. In the current study, initial and modified porous FO membranes are fabricated, and the intrinsic membrane separation properties are also investigated. Polyacrylic acid sodium (PAAS), sodium polystyrene sulfonate (PSS) and polyethylene glycol (PEG) are used to evaluate the effects of draw solution (DS) in FO experiments. Particularly, alkali treated modified porous FO membrane and PAAS are utilized in the subsequent wastewater treatment owing to the high performance of permeation and rejection. Furthermore, the optimal values of operating parameters (flow velocity, DS concentration and DS temperature), which are selected according to the effects of water flux (J V ) in the FO and MD process, are evaluated and utilized to investigate the dynamic changes of J V in the high-salinity organic wastewater treatment with hybrid FO-MD system.Results show that the hybrid FO-MD system with porous FO membranes and polyelectrolyte DS maintain the operation in a constant flux of 16.61 LMH, and the permeate solution can be effectively recovered with favorable quality. This study provides remarkable implications for the design of porous FO membranes and the application of hybrid FO-MD system in the wastewater treatment.

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“…The pure water flux (J) of a membrane with an effective area (A) was determined by measuring the volume of pure water (V) passing through the membrane within ∆t interval ambient temperature. Equation (3) was used to calculate the pure water flux [13,18]:…”

Section: Pure Water Fluxmentioning

confidence: 99%

Effect of Polyvinyl Pyrrolidone on Polyvinyl Chloride-Graft-Acrylamide Membranes

Al-Bahate¹,

Shabeeb

Khalil

2020

ETJ

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Polyvinyl-chloride (PVC) was dehydrochlorinated by alkaline-solution (NaOH) in determining molarity (3.0 M) followed by grafting with acrylamide (AM) monomer onto dehydrochlorinated PVC (DHPVC) backbone by free-radical graft copolymerization to produce new grafted polymer referred as graft 3M. Then investigated the effect of polyvinyl pyrrolidone (PVP) addition on the grafted polymer. Membranes from pure PVC, graft 3M, and graft 3M/ PVP were synthesis via a phase inversion method. The successful AM grafting onto PVC was confirmed by characterization of the membranes by Atomic Force Microscopy (AFM) and Field Emission Scanning Electron Microscope (FESEM) analysis, porosity, pore size, and contact angle measurements. The new synthesis (graft 3M) and (graft 3M/ PVP) membranes show excellent hydrophilicity in compared to pure PVC membranes, confirmed by higher pure water flux (PWF). The graft 3M/ 3wt.% PVP membrane exhibited the highest pure water permeate flux was about 540 L/m2 h at 28 °C of feed temperature and 1bar of pressure, i.e. was improved by about 270 times compared to the unmodified PVC membrane and 2.35 times compared to the graft 3M membrane.

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Performance evaluation of polyvinylchloride/polyacrylonitrile ultrafiltration blend membrane

Cited by 24 publications

References 41 publications

Enhanced modification technique for polyacrylonitrile UF membranes by direct hydrolysis in the immersion bath

Enhanced modification technique for polyacrylonitrile UF membranes by direct hydrolysis in the immersion bath

The applications of porous FO membranes and polyelectrolyte draw solution in the high‐salinity organic wastewater treatment with a hybrid forward osmosis‐membrane distillation system

Effect of Polyvinyl Pyrrolidone on Polyvinyl Chloride-Graft-Acrylamide Membranes

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