Tailoring ion exchange membranes to enable low osmotic water transport and energy efficient electrodialysis

Porada, S.; Egmond, W.J. van; Post, J.W.; Saakes, Michel; Hamelers, H.V.M.

doi:10.1016/j.memsci.2018.01.050

Cited by 51 publications

(29 citation statements)

References 48 publications

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“…Experimental observations of osmotic swelling of liposomes support this view (Chabanon et al, 2017). Yet, it was estimated that the energy cost of transporting a water molecule across an intact membrane is prohibitively high at room temperature (Porada et al, 2018), and hence the likely mechanism of water transfer is via transient pores as suggested earlier (Volkov et al, 1997). The results of our simulations are consistent with this latter view.…”

Section: Discussionsupporting

confidence: 87%

Interaction of Small Ionic Species With Phospholipid Membranes: The Role of Metal Coordination

Houri

Balage

et al. 2019

Front. Mater.

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In studies of the transfer, distribution and biochemical activity of metal ions it is typically assumed that the phospholipid bilayer acts as an inert barrier. Yet, there is mounting evidence that metal ions can influence the physical properties of membranes. Little is known of the basis of this effect. In this work the location and distribution of common metal ions: Na + , Mg 2+ , and Ca 2+ in phospholipid membranes were studied. Computer simulations of lipid membrane segments in aqueous environment showed that the ions penetrate the membrane headgroup zone and co-localize with the phosphate and the ester moieties. Analysis of the chemical environment of the ions in the simulations suggested that the co-localization is facilitated by coordination to the polar oxygen atoms of the phosphate and ester groups in typical coordination geometries of each ionic species, where the coordination shells are completed by water molecules. In contrast, the counterions do not penetrate the headgroup zone but form a layer over the membrane instead; this layer is also an effective metal exclusion zone. Importantly, the choline groups appear to be distributed almost exactly in the same plane as the phosphate, suggesting that the zwitterion dipole is preferentially horizontally aligned: this suggests that the distribution of the Cl − over the membrane surface is not a direct result of interaction with the choline groups, but rather an effect of the field emanating from the metal ion content of the membrane. Such a well defined ion distribution is expected to have a strong influence on membrane properties, in particular phase transition temperatures via increased in-plane cohesion; this was proven by calorimetry measurements using differential scanning calorimetry of suspended liposomes and quartz crystal microbalance-based measurements on supported single bilayer membranes. These findings shed a new light on the role metal ions play in stabilizing biological membranes.

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Section: Discussionsupporting

confidence: 87%

Interaction of Small Ionic Species With Phospholipid Membranes: The Role of Metal Coordination

Houri

Balage

et al. 2019

Front. Mater.

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“…The salt permeance of the IEMs varied by ~2.5 orders of magnitude, from 0.002-0.5 L.m -2 .hr -1 (Figure 3a and 3b, empty bars, Table S2). This range of values is consistent with data reported by Porada et al 21 for lab-prepared IEMs based on FAS and FKE polymer solutions (0.003-0.025 L.m -2 .hr -1 ). Similarly to the results for water permeance, CEMs generally had higher salt permeance than AEMs, but the contrast between CEMs and AEMs was greater than that seen for water permeance.…”

Section: Salt Permeancesupporting

confidence: 92%

“…10,17 Because neither osmosis nor salt diffusion responds to electric fields, both have a detrimental effect on the energy or separation efficiency of electrochemical processes such as electrodialysis (ED) and reverse electrodialysis (RED). 12, [18][19][20][21] Osmosis and salt diffusion both lower the salt concentration in the concentrated feed, which in ED compromises separation, and in RED causes uncontrolled mixing (i.e., mixing that does not produce electricity, Figure 1). The magnitude of the effects of water and salt transport on efficiency depends on both the process (ED, RED, energy storage, etc.)…”

Section: Introductionmentioning

confidence: 99%

Microstructure determines water and salt permeation in commercial ion exchange membranes

Kingsbury

Zhu²,

Flotron³

et al. 2018

Preprint

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Ion exchange membrane (IEM) performance in electrochemical processes such as fuel cells, redox flow batteries, or reverse electrodialysis (RED) is typically quantified through membrane selectivity and conductivity, which together determine the energy efficiency. However, water and co-ion transport (i.e., osmosis and salt diffusion / fuel crossover) also impact energy efficiency by allowing uncontrolled mixing of the electrolyte solutions to occur. For example, in RED with hypersaline water sources, uncontrolled mixing consumes 20-50% of the available mixing energy. Thus, in addition to high selectivity and high conductivity, it is desirable for IEMs to have low permeability to water and salt in order to minimize energy losses. Unfortunately, there is very little quantitative water and salt permeability information available for commercial IEMs, making it difficult to select the best membrane for a particular application. Accordingly, we measured the water and salt transport properties of 20 commercial IEMs and analyzed the relationships between permeability, diffusion and partitioning according to the solution-diffusion model. We found that water and salt permeance vary over several orders of magnitude among commercial IEMs, making some membranes better-suited than others to electrochemical processes that involve high salt concentrations and/or concentration gradients. Water and salt diffusion coefficients were found to be the principal factors contributing to the differences in permeance among commercial IEMs. We also observed that water and salt permeability were highly correlated to one another for all IEMs studied, regardless of polymer type or reinforcement. This finding suggests that transport of mobile salt in IEMs is governed by the microstructure of the membrane, and provides clear evidence that mobile salt does not interact strongly with polymer chains in highly-swollen IEMs. <br>

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“…For example, Zlotorowicz et al [11] described experiments on the reverse electrodialysis of aqueous solutions of NaCl in terms of thermodynamics of irreversible processes, which allowed them to relate the permselectivity of an ion-exchange membrane to the salt and water transport numbers and the molality of solutions on both sides of the membrane. Porada et al [12], likewise, experimentally studied osmotic and electroosmotic water transport in the case of electrodialysis through specially prepared reinforced polymer cation-and anion-exchange membranes [12]. They showed that the use of a mesh inside such membranes can reduce osmotic water transport because of a decrease in surface area and a weaker membrane swelling.…”

Section: Model Testing and Discussionmentioning

confidence: 99%

Approbation of the Cell Model of a Cation-Exchange Membrane on 1 : 1 Electrolytes

Филиппов

Shkirskaya

2019

Membr. Membr. Technol.

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Using the algebraic formula derived earlier to determine the electroosmotic permeability of an ionexchange membrane at a given constant current density, experimental results obtained by the authors for an extrusion perfluorinated membrane and aqueous solutions of the 1 : 1 electrolytes HCl, NaCl, KCl, LiCl, and CsCl have been analyzed. A cell model has been successfully tested using experimental data on the electrical conductivity and electroosmotic permeability of the MF-4SC cation-exchange membrane at given current density and concentration of these electrolytes. A good agreement between the theoretical and experimental data has been obtained, and the physicochemical parameters of the cell model have been determined.

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Tailoring ion exchange membranes to enable low osmotic water transport and energy efficient electrodialysis

Cited by 51 publications

References 48 publications

Interaction of Small Ionic Species With Phospholipid Membranes: The Role of Metal Coordination

Interaction of Small Ionic Species With Phospholipid Membranes: The Role of Metal Coordination

Microstructure determines water and salt permeation in commercial ion exchange membranes

Approbation of the Cell Model of a Cation-Exchange Membrane on 1 : 1 Electrolytes

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