The role of ionic strength and odd–even effects on the properties of polyelectrolyte multilayer nanofiltration membranes

Grooth, Joris de; Oborny, Radek; Potreck, Jens; Nijmeijer, DC Kitty; Vos, Wiebe M. de

doi:10.1016/j.memsci.2014.10.044

Cited by 153 publications

(190 citation statements)

References 72 publications

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“…In contrast, the salt rejection stays relatively constant with an increasing number of bi-layers. It seems that already after 1-2 bi-layers, the PEM coating fully covers the support membrane, after which an increase in the number of layers does not lead to improved separation [32]. The results obtained on our larger module scale, is fully consistent with the results obtained at the single fiber level.…”

Section: Upscaling Of Cross Flow Dynamic Coating Approachsupporting

confidence: 89%

“…So, it would be very beneficial to develop hollow fiber NF membranes at a lower MWCO, and for that the surface modification of a UF support using LbL assembly of PEMs is a very promising method. This approach was shown to successfully produce hollow fiber NF membranes with precise control over separation performance [30][31][32][33][34]. In these studies, LbL deposition is performed by dip coating (static coating) by immersing the hollow fibers into the solutions of PEs followed by intermittent rinsing steps.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of multifunctional hollow fiber nanofiltration membranes by dynamic assembly of weak polyelectrolyte multilayers

Ilyas

English

Aimar

et al. 2017

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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A B S T R A C TIn this work, we investigate the effect of preparation conditions for dynamic layer-by-layer (LbL) coating, to prepare multifunctional hollow fiber nanofiltration (NF) membranes. Dynamic coating was performed at constant pressure and at variable cross flow speeds. In this way, polyelectrolyte multilayers (PEMs) were formed of the weak polyelectrolytes poly(acrylic acid) (PAA) and poly(allylamine hydrochloride) (PAH), on a negatively charged polyethersulfone ultrafiltration (UF) support. The resulting membrane performance was investigated and compared to membranes prepared by different methods (dip coating and dead end filtration), and it was found to be comparable. It was shown that PAH/ PAA multilayers can be fabricated reproducibly and homogenously using optimised dynamic LbL deposition conditions on single fiber module (surface area of 6.2 cm 2 ) as well as on a module of 15 fibers (surface area of 67 cm 2 ). Moreover, the approach of dynamic coating could be easily up scaled to coat existing UF modules. The prepared membranes reject the solutes on the basis of size exclusion and Donnan exclusion, retaining small organic solutes and divalent ions. Membranes terminated with PAA exhibit a low fouling tendency compared to membranes terminated with PAH and compared to the UF support membrane. Moreover, if severe membrane fouling would occur after prolonged use, the PEM coating, including any attached foulants can be removed by rinsing with a solution that combines a low pH and a high salinity (pH 3, 3 M). The surface of bovine serum albumin (BSA) fouled membranes were successfully cleaned at least twice, after which a new PEM coating could be re-applied by active coating.

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Section: Upscaling Of Cross Flow Dynamic Coating Approachsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Preparation of multifunctional hollow fiber nanofiltration membranes by dynamic assembly of weak polyelectrolyte multilayers

Ilyas

English

Aimar

et al. 2017

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…PEM coatings were applied on the inside of the fibers by closing the permeate side of the membrane module thus only allowing the coating solution to reach the inside of the fibers [33]. Before coating, the membrane modules were wetted in water overnight.…”

Section: Membrane Modificationmentioning

confidence: 99%

Long term physical and chemical stability of polyelectrolyte multilayer membranes

Grooth

Haakmeester

Wever

et al. 2015

Journal of Membrane Science

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“…By salt addition into the polyelectrolyte solution, the thickness of each individual layer can be adjusted [36][37][38]. To investigate the effects of increased ionic strength on PEMs, we added NaCl to the outmost layer CHI solution and modified the base membrane with different number of PEMs.…”

Section: Effect Of Ionic Strengthmentioning

confidence: 99%

Layer-by-layer surface modification of polyethersulfone membranes using polyelectrolytes and AgCl/TiO 2 xerogels

Kaner

Johnson

Şeker

et al. 2015

Journal of Membrane Science

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a b s t r a c tIn this study, the layer-by-layer (LbL) assembly method was employed to modify a commercial polyethersulfone (PES) membrane by successive adsorption of chitosan and alginate as cationic and anionic polyelectrolytes. To enhance anti-biofouling property, pure, PEG mixed and PEGylated AgCl/TiO 2 xerogels were incorporated solely in the top layer of the LbL-modified membranes. Organic and biological foulings were addressed separately using alginate and Escherichia coli bacteria suspensions as the organic and biological model foulants, respectively. LbL-modifying the commercial PES membrane successively with chitosan and alginate polyelectrolyte multilayers prevented organic fouling extensively. In addition, we found that AgCl/TiO 2 -incorporated membranes show higher water permeability and improved resistance to biological fouling as compared to the PES membrane. Silver amounts in consecutively collected permeate samples were quantified by ICP-MS analysis to assess the stability of AgCl/TiO 2 -incorporated layers. Silver loss per filtration cycle followed an increasing trend initially, up to a filtration volume totaling 3000 L/m 2 , leading to 4.2% reduction in the immobilized silver amount. After that, silver loss per filtration cycle stabilized at $ 7.44 μg/L, which extrapolates to $ 265 days time-span for the remaining silver to be released at a filtration rate of $ 1000 L/m 2 h. Antibacterial activity tests showed that AgCl/TiO 2 -incorporated layers do not permit bacterial growth on the membrane surface.

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The role of ionic strength and odd–even effects on the properties of polyelectrolyte multilayer nanofiltration membranes

Cited by 153 publications

References 72 publications

Preparation of multifunctional hollow fiber nanofiltration membranes by dynamic assembly of weak polyelectrolyte multilayers

Preparation of multifunctional hollow fiber nanofiltration membranes by dynamic assembly of weak polyelectrolyte multilayers

Long term physical and chemical stability of polyelectrolyte multilayer membranes

Layer-by-layer surface modification of polyethersulfone membranes using polyelectrolytes and AgCl/TiO 2 xerogels

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