Optimization of Polymeric Membrane Characteristics through Thermal Treatment and Deposition of Polyelectrolyte Layers Using Response Surface Modeling

Ng, Law Yong; Mohammad, Abdul Wahab; Ng, Ching Yin; Rohani, Rosiah

doi:10.1002/adv.21472

Cited by 7 publications

(2 citation statements)

References 38 publications

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“…The PWP values reported here are consistently low relative to the ones of PSS–PDADMAC multilayer membranes in the literature (5–15 L m –2 h –1 bar –1 ). 20 , 29 , 57 − 60 This variation might be due to differences in selective layer thickness and density. On the other hand, MgSO 4 retentions are reasonably comparable; in the literature, best results vary from 60% to more than 90%.…”

Section: Resultsmentioning

confidence: 99%

Polyelectrolyte Complex Membranes via Salinity Change Induced Aqueous Phase Separation

Durmaz

Baig

Willott

et al. 2020

ACS Appl. Polym. Mater.

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Polymeric membranes are used on very large scales for drinking water production and kidney dialysis, but they are nearly always prepared by using large quantities of unsustainable and toxic aprotic solvents. In this study, a water-based, sustainable, and simple way of making polymeric membranes is presented without the need for harmful solvents or extreme pH conditions. Membranes were prepared from water-insoluble polyelectrolyte complexes (PECs) via aqueous phase separation (APS). Strong polyelectrolytes (PEs), poly(sodium 4-styrenesulfonate) (PSS), and poly(diallyldimethylammonium chloride) (PDADMAC) were mixed in the presence of excess of salt, thereby preventing complexation. Immersing a thin film of this mixture into a low-salinity bath induces complexation and consequently the precipitation of a solid PEC-based membrane. This approach leads to asymmetric nanofiltration membranes, with thin dense top layers and porous, macrovoid-free support layers. While the PSS molecular weight and the total polymer concentrations of the casting mixture did not significantly affect the membrane structure, they did affect the film formation process, the resulting mechanical stability of the films, and the membrane separation properties. The salt concentration of the coagulation bath has a large effect on membrane structure and allows for control over the thickness of the separation layer. The nanofiltration membranes prepared by APS have a low molecular weight cutoff (<300 Da), a high MgSO 4 retention (∼80%), and good stability even at high pressures (10 bar). PE complexation induced APS is a simple and sustainable way to prepare membranes where membrane structure and performance can be tuned with molecular weight, polymer concentration, and ionic strength.

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Section: Resultsmentioning

confidence: 99%

Polyelectrolyte Complex Membranes via Salinity Change Induced Aqueous Phase Separation

Durmaz

Baig

Willott

et al. 2020

ACS Appl. Polym. Mater.

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“…Low thermal treatment at 50˚C was employed on commercial PES20 membranes [15] for 17.07 min, using a forced-air convection oven (Froilabo, France) to avoid membrane degradation, which was followed by the deposition of PDADMAC/PSS layers [16,17]. PSS solution was combined with 0.1 wt% of the nanoparticles to minimise the effect of agglomeration [18] and to produce polyelectrolyte layers containing the nanoparticles (see Table 1).…”

Section: Membrane Modification Methodsmentioning

confidence: 99%

Development of a nanofiltration membrane for humic acid removal through the formation of polyelectrolyte multilayers that contain nanoparticles

Mohammad

Rohani³

et al. 2015

Desalination and Water Treatment

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A B S T R A C TPoly(sodium-4-styrenesulphonate) (PSS) and poly(diallyldimethylammonium chloride) have been employed to construct polyelectrolyte multilayers on a polyethersulphone substrate for use in the nanofiltration of humic acid. Self-synthesised Ag 2 O and commercial ZnO nanoparticles were incorporated into the multilayers separately, showing increases in the permeability from 7.53 ± 1.83 to 8.39 ± 1.37 and 8.62 ± 1.03 L m −2 h −1 bar −1 , respectively, with no significant leaching observed in the permeates. All polyelectrolyte-modified membranes exhibited good film-formation stabilities and high humic acid retention capabilities, which ranged from 93.14 ± 2.43 to 95.57 ± 3.87%. Less humic acid solutes were deposited onto the surface of the polyelectrolyte-modified membrane, which was confirmed through field emission scanning electron microscopy images. The contact angle was reduced from 44.00 ± 3.46˚to 39.10 ± 3.47˚when the membrane surface was hydrophilised with PSS as the terminating layer.

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Multivariable power least squares method: Complementary tool for Response Surface Methodology

Tey

Lee

Asako

et al. 2020

Ain Shams Engineering Journal

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Optimization of Polymeric Membrane Characteristics through Thermal Treatment and Deposition of Polyelectrolyte Layers Using Response Surface Modeling

Cited by 7 publications

References 38 publications

Polyelectrolyte Complex Membranes via Salinity Change Induced Aqueous Phase Separation

Polyelectrolyte Complex Membranes via Salinity Change Induced Aqueous Phase Separation

Development of a nanofiltration membrane for humic acid removal through the formation of polyelectrolyte multilayers that contain nanoparticles

Multivariable power least squares method: Complementary tool for Response Surface Methodology

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