Enhanced selectivity and performance of heterogeneous cation exchange membranes through addition of sulfonated and protonated Montmorillonite

Radmanesh, Farzaneh; Rijnaarts, Timon; Moheb, Ahmad; Sadeghi, Morteza; Vos, Wiebe M. de

doi:10.1016/j.jcis.2018.08.100

Cited by 43 publications

(18 citation statements)

References 45 publications

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“…(a) the equilibrium counter-ion composition in the membrane and corresponding membrane conductivity needs be measured to substantiate or disprove the assumption of negligible ion interaction; (b) the thickness of hydrated CEMs with different counter-ion composition needs to be measured to calculate the dimensional swelling degree. (c) the ohmic membrane resistance obtained by impedance spectroscopy together with the hydrated membrane thickness will be used to calculate the membrane conductivity (see below, Equation 26). (d) For the benchmark values of , the trans-membrane ionic fluxes need to be measured from the solution composition evolution in conventional ED experiments with a six-compartment cell ( Figure 2).…”

Section: Conductivity and Counter-ion Selectivitymentioning

confidence: 99%

“…All the measurements are performed at room temperature. The membrane conductivity can then be calculated from the membrane ohmic resistance as: = • (26) is the ohmic resistance of hydrated CEMs when the counter-ion is (Ω), is the effective cross-sectional area of hydrated CEMs in EIS (2 cm 2 ). The reported data are based on 3 replicate samples with multiple measurements.…”

Section: Conductivity Measurements By Impedance Spectroscopymentioning

confidence: 99%

“…A group of representative Nyquist plot data are shown in Figure 5. After obtaining the membrane ohmic resistance as described in Section 3.4, the through-plain membrane conductivity is calculated with Equation 26. The results about CEMs with K + /Na + ions are shown in Figure 6.…”

Section: Membrane Conductivitymentioning

confidence: 99%

“…The membrane area resistance is the key parameter that determines the ohmic energy losses of electro-chemical processes as mentioned above [2]. As a result, the core fundamental research about IEMs is concerned with the conductivity, as well as the selectivity [23][24][25][26]. However, as one`s attention could easily be drawn to the general trade-off between selectivity and conductivity, to the best of our knowledge, we find no studies that attempt to provide a different insight into the relation between these two essential properties.…”

Section: Introductionmentioning

confidence: 99%

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Ion mobility and partition determine the counter-ion selectivity of ion exchange membranes

Luo

Roghmans

Weßling

2020

Journal of Membrane Science

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Ion (perm)selectivity and conductivity are the two most essential properties of an ion exchange membrane, yet no quantitative relation between them has been suggested. In this work, the selectivity between two different counter-ions is correlated to the membrane conductivity. We show that the counter-ion selectivity measured by conventional electrodialysis (ED) can be expressed by the product of two parameters: (a) the mobility ratio between these two different counter-ions in the membrane and (b) their partition coefficient between the solution and the membrane. This is reminiscent of the classical solution-diffusion model. Via the counter-ion mobility in the membrane, the selectivity could be simply expressed with the membrane conductivity and dimensional swelling degree at pure counter-ion forms and at mixed counter-ion form when the membrane has been equilibrated with 1:1 equivalence ratio of the two counter-ions in the solution. This correlation is validated experimentally for the ion selectivity of K + /Na + in two commercial hydrocarbon-based cation exchange membranes (CEMs). For K + /Na + in a commercial perfluorosulfonic CEM, and for Mg 2+ /Na + in all the three types of CEMs, the correlation could predict the counter-ion partition very well; but there is an underestimation of the K + /Na + and Mg 2+ /Na + mobility ratios afforded by this correlation, which might be due to simplification of the cation activity coefficients in CEMs. This work offers a convenient method to decouple experimentally the effect of partition and mobility in controlling the membrane selectivity, and also proposes a new perspective to study the selectivity as well as conductivity of ion exchange membranes.

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Section: Conductivity and Counter-ion Selectivitymentioning

confidence: 99%

Section: Conductivity Measurements By Impedance Spectroscopymentioning

confidence: 99%

Section: Membrane Conductivitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ion mobility and partition determine the counter-ion selectivity of ion exchange membranes

Luo

Roghmans

Weßling

2020

Journal of Membrane Science

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“…This method involves casting a polymer solution onto a lm, followed by phase inversion to remove the solvent and get solid membranes. [25][26][27][28] However, there are several disadvantages of using this method. Firstly, harmful organic solvents such as dimethylformamide (DMF) and dimethylacetamide (DMAc) are oen used in this method, and therefore post-disposal of these solvents is inevitable.…”

Section: Introductionmentioning

confidence: 99%

High performance cation exchange membranes synthesized via in situ emulsion polymerization without organic solvents and corrosive acids

Jiang

Ladewig

2019

J. Mater. Chem. A

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Material Design Strategies for Recovery of Critical Resources from Water

et al. 2023

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Population growth, urbanization, and decarbonization efforts are collectively straining the supply of limited resources that are necessary to produce batteries, electronics, chemicals, fertilizers, and other important products. Securing the supply chains of these critical resources via the development of separation technologies for their recovery represents a major global challenge to ensure stability and security. Surface water, groundwater, and wastewater are emerging as potential new sources to bolster these supply chains. Recently, a variety of material‐based technologies have been developed and employed for separations and resource recovery in water. Judicious selection and design of these materials to tune their properties for targeting specific solutes is central to realizing the potential of water as a source for critical resources. Here, the materials that are developed for membranes, sorbents, catalysts, electrodes, and interfacial solar steam generators that demonstrate promise for applications in critical resource recovery are reviewed. In addition, a critical perspective is offered on the grand challenges and key research directions that need to be addressed to improve their practical viability.

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Enhanced selectivity and performance of heterogeneous cation exchange membranes through addition of sulfonated and protonated Montmorillonite

Cited by 43 publications

References 45 publications

Ion mobility and partition determine the counter-ion selectivity of ion exchange membranes

Ion mobility and partition determine the counter-ion selectivity of ion exchange membranes

High performance cation exchange membranes synthesized via in situ emulsion polymerization without organic solvents and corrosive acids

Material Design Strategies for Recovery of Critical Resources from Water

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