On the permselectivity of cation-exchange membranes bearing an ion selective coating

Roghmans, Florian; Evdochenko, E.; Martí-Calatayud, M.C.; Garthe, Michael; Tiwari, Rahul; Walther, Andreas; Weßling, Matthias

doi:10.1016/j.memsci.2020.117854

Cited by 45 publications

(23 citation statements)

References 30 publications

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“…In particular, the greater the driving force (voltage/current in the case of IEMs or pressure in the case of nanofiltration (NF) membranes), the less specific permselectivity in most cases. In a number of works [ 52 , 281 , 319 , 320 , 329 , 330 , 331 , 332 , 333 ], the IEM selective permeability significantly decreases with current density increasing and practically disappears when the limiting current density is reached. One of the reasons for the decrease in selective permeability is that the control of mass transfer passes from the membrane to the diffusion layer when approaching the limiting state [ 281 , 329 , 330 ].…”

Section: Compromise Between the Specific Permselectivity And Permementioning

confidence: 99%

“…This reduces the transfer of the target ion. In addition, the change in pH in the diffusion layer caused by water splitting can affect the properties of the modifying layer [ 52 , 320 ]. Thus, an increase in its swelling and a decrease in charge density can significantly reduce the effect of monovalent permselectivity.…”

Section: Compromise Between the Specific Permselectivity And Permementioning

confidence: 99%

“…There is every reason to believe that their processing, along with recycling, would determine a major part of production of a number of metals and their compounds [ 39 , 46 , 47 , 48 , 49 , 50 ]. For the development of such technologies the selectivity between ions with different valences of the same sign (mono- and multivalent) is no less important [ 51 , 52 , 53 , 54 ]. The processes of their separation have recently been extensively reviewed [ 55 , 56 , 57 , 58 ].…”

Section: Introductionmentioning

confidence: 99%

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Selectivity of Transport Processes in Ion-Exchange Membranes: Relationship with the Structure and Methods for Its Improvement

Стенина

Голубенко

Nikonenko

et al. 2020

IJMS

125

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Nowadays, ion-exchange membranes have numerous applications in water desalination, electrolysis, chemistry, food, health, energy, environment and other fields. All of these applications require high selectivity of ion transfer, i.e., high membrane permselectivity. The transport properties of ion-exchange membranes are determined by their structure, composition and preparation method. For various applications, the selectivity of transfer processes can be characterized by different parameters, for example, by the transport number of counterions (permselectivity in electrodialysis) or by the ratio of ionic conductivity to the permeability of some gases (crossover in fuel cells). However, in most cases there is a correlation: the higher the flux density of the target component through the membrane, the lower the selectivity of the process. This correlation has two aspects: first, it follows from the membrane material properties, often expressed as the trade-off between membrane permeability and permselectivity; and, second, it is due to the concentration polarization phenomenon, which increases with an increase in the applied driving force. In this review, both aspects are considered. Recent research and progress in the membrane selectivity improvement, mainly including a number of approaches as crosslinking, nanoparticle doping, surface modification, and the use of special synthetic methods (e.g., synthesis of grafted membranes or membranes with a fairly rigid three-dimensional matrix) are summarized. These approaches are promising for the ion-exchange membranes synthesis for electrodialysis, alternative energy, and the valuable component extraction from natural or waste-water. Perspectives on future development in this research field are also discussed.

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Section: Compromise Between the Specific Permselectivity And Permementioning

confidence: 99%

Section: Compromise Between the Specific Permselectivity And Permementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Selectivity of Transport Processes in Ion-Exchange Membranes: Relationship with the Structure and Methods for Its Improvement

Стенина

Голубенко

Nikonenko

et al. 2020

IJMS

125

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“…The permselectivity of the traditional IEMs could be improved in multiple approaches: (i) crosslinking to get high density of the membranes' structure, [24] (ii) membranes surface coating with a positively charged layer to facilitate the exclusion of multivalent cations via electrostatic repulsion [23,25], and (iii) blending of polymers with either other polymers or microporous crystalline materials such as zeolites to systematize the permselectivity of mixed matrix membranes (MMMs) [26,27]. Zeolites are crystalline aluminosilicates with systematic pores and cavities of molecular dimensions and are famous for their excellent ion-exchange capacity [28].…”

Section: Introductionmentioning

confidence: 99%

PVA-Based Mixed Matrix Membranes Comprising ZSM-5 for Cations Separation

et al. 2020

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The traditional ion-exchange membranes face the trade-off effect between the ion flux and perm-selectivity, which limits their application for selective ion separation. Herein, we amalgamated various amounts of the ZSM-5 with the polyvinyl alcohol as ions transport pathways to improve the permeability of monovalent cations and exclusively reject the divalent cations. The highest contents of ZSM-5 in the mixed matrix membranes (MMMs) can be extended up to 60 wt% while the MMMs with optimized content (50 wt%) achieved high perm-selectivity of 34.4 and 3.7 for H+/Zn2+ and Li+/Mg2+ systems, respectively. The obtained results are high in comparison with the commercial CSO membrane. The presence of cationic exchange sites in the ZSM-5 initiated the fast transport of proton, while the microporous crystalline morphology restricted the active transport of larger hydrated cations from the solutions. Moreover, the participating sites and porosity of ZSM-5 granted continuous channels for ions electromigration in order to give high limiting current density to the MMMs. The SEM analysis further exhibited that using ZSM-5 as conventional fillers, gave a uniform and homogenous formation to the membranes. However, the optimized amount of fillers and the assortment of a proper dispersion phase are two critical aspects and must be considered to avoid defects and agglomeration of these enhancers during the formation of membranes.

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“…Ion-exchange membranes are used for several practical applications, the most common of which are water treatment and concentrating, food purification, and a number of other technologies associated with separation processes based on ion transfer [1][2][3][4]. The membrane selectivity in these processes is primarily determined by the ratio of transfer rates of ions with different signs or charges [5][6][7][8]. In most technologies, relatively cheap heterogeneous membranes are most commonly used.…”

mentioning

confidence: 99%

Dependence of the Transport Properties of Perfluorinated Sulfonated Cation-Exchange Membranes on Ion-Exchange Capacity

Прихно

Safronova

Стенина

et al. 2020

Membr. Membr. Technol.

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The transport properties of ion-exchange membranes depend on many factors, primarily, on ionexchange capacity and chemical composition. Therefore, the correlation of transport properties with a single particular parameter is generally not quite strict. In this study, the dependence of transport properties of several perfluorinated sulfonated cation-exchange membranes that differ in side chain length and fraction of fragments containing ether groups on ion-exchange capacity is analyzed. It is shown that, with a decrease in the ion-exchange capacity from 1.35 to 0.66 mg-equiv/g, the proton conductivity of membranes contacting water and their diffusion permeability with respect to a 0.1 M HCl solution decrease by two orders of magnitude. A decrease in relative humidity leads to the most significant decrease in the conductivity of membranes with a low ion-exchange capacity. Thus, at a relative humidity of 32%, the conductivity of the studied membranes decreases more than 600-fold with a decrease in ion-exchange capacity. In general, the oxygen permeability of membranes is characterized by a similar dependence. However, in this set of membranes, it varies as little as threefold.

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On the permselectivity of cation-exchange membranes bearing an ion selective coating

Cited by 45 publications

References 30 publications

Selectivity of Transport Processes in Ion-Exchange Membranes: Relationship with the Structure and Methods for Its Improvement

Selectivity of Transport Processes in Ion-Exchange Membranes: Relationship with the Structure and Methods for Its Improvement

PVA-Based Mixed Matrix Membranes Comprising ZSM-5 for Cations Separation

Dependence of the Transport Properties of Perfluorinated Sulfonated Cation-Exchange Membranes on Ion-Exchange Capacity

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