Recent advances in monovalent ion selective membranes towards environmental remediation and energy harvesting

Wang, Wenguang; Zhang, Yanqiu; Xue, Caihong; Zhou, Wanji; Bao, Hongfei; Lau, Cher Hon; Yang, Xiaobin; Ma, Jun; Shao, Lu

doi:10.1016/j.seppur.2022.121520

Cited by 32 publications

(18 citation statements)

References 216 publications

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“…Therefore, advancing the function from just ion exchange to ion selective separations would improve the cost-effectiveness and energy-efficiency of current IEM applications and expand their utility to meet emerging separation needs. To this end, several recent articles offer insightful reviews on the selectivity of ion-exchange membranes (Kreuer, 2014;Luo et al, 2018;Epsztein et al, 2020;Sujanani et al, 2020;DuChanois et al, 2021;Kreuer and Münchinger, 2021;Wang et al, 2022b). However, reviews that encompass all the different types of selectivity listed above are presently lacking in literature, with ion/solvent and ion/uncharged solute selectivities, in particular, being frequently overlooked.…”

Section: Introductionmentioning

confidence: 99%

Advancing ion-exchange membranes to ion-selective membranes: principles, status, and opportunities

Fan

Huang

Yip

2022

Front. Environ. Sci. Eng.

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Ion-exchange membranes (IEMs) are utilized in numerous established, emergent, and emerging applications for water, energy, and the environment. This article reviews the five different types of IEM selectivity, namely charge, valence, specific ion, ion/solvent, and ion/uncharged solute selectivities. Technological pathways to advance the selectivities through the sorption and migration mechanisms of transport in IEM are critically analyzed. Because of the underlying principles governing transport, efforts to enhance selectivity by tuning the membrane structural and chemical properties are almost always accompanied by a concomitant decline in permeability of the desired ion. Suppressing the undesired crossover of solvent and neutral species is crucial to realize the practical implementation of several technologies, including bioelectrochemical systems, hypersaline electrodialysis desalination, fuel cells, and redox flow batteries, but the ion/solvent and ion/uncharged solute selectivities are relatively understudied, compared to the ion/ion selectivities. Deepening fundamental understanding of the transport phenomena, specifically the factors underpinning structure-property-performance relationships, will be vital to guide the informed development of more selective IEMs. Innovations in material and membrane design offer opportunities to utilize ion discrimination mechanisms that are radically different from conventional IEMs and potentially depart from the putative permeability-selectivity tradeoff. Advancements in IEM selectivity can contribute to meeting the aqueous separation needs of water, energy, and environmental challenges.

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Section: Introductionmentioning

confidence: 99%

Advancing ion-exchange membranes to ion-selective membranes: principles, status, and opportunities

Fan

Huang

Yip

2022

Front. Environ. Sci. Eng.

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“…There are problems of separation of sodium and calcium [ 23 ]. In this regard, the search for ways to separate singly and doubly charged ions is attracting more and more attention [ 24 , 25 , 26 ]. A number of approaches have been proposed to improve the selectivity of industrial membranes [ 27 ], e.g., membrane profiling [ 28 ], deposition of a layer of oppositely charged polyelectrolyte or several layers of alternately charged polyelectrolytes [ 25 , 29 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

Improvement of Selectivity of RALEX-CM Membranes via Modification by Ceria with a Functionalized Surface

et al. 2023

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Ion exchange membranes are widely used for water treatment and ion separation by electrodialysis. One of the ways to increase the efficiency of industrial membranes is their modification with various dopants. To improve the membrane permselectivity, a simple strategy of the membrane surface modification was proposed. Heterogeneous RALEX-CM membranes were surface-modified by ceria with a phosphate-functionalized surface. Despite a decrease in ionic conductivity of the prepared composite membranes, their cation transport numbers slightly increase. Moreover, the modified membranes show a threefold increase in Ca2+/Na+ permselectivity (from 2.1 to 6.1) at low current densities.

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“…The RED stack consists of alternately stacked cation-exchange membranes (CEMs) and anion-exchange membranes (AEMs) and is used to get the Gibbs energy released by mixing solutions of various concentrations. The power characteristic of the RED process depends on the membranes properties [ 1 , 3 , 10 , 11 , 12 ], the electrolyte solutions flow velocities across the RED stack [ 2 , 13 , 14 , 15 , 16 ], salinity ratio [ 13 , 14 , 16 , 17 ], the construction peculiarities of the RED stack [ 13 , 18 ], the solutions composition [ 16 , 19 , 20 ], and the temperature or its gradient [ 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Profiled Ion-Exchange Membranes for Reverse and Conventional Electrodialysis

Loza

Kutenko

et al. 2022

Membranes

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Profiled ion-exchange membranes are promising for improving the parameters of reverse electrodialysis due to the reduction of pumping power and electrical resistance. The smooth commercial heterogeneous cation-exchange MK-40 and anion-exchange MA-41 membranes were chosen as the initial membranes. Profiled membranes with three different types of surface profiles were obtained by hot pressing the initial membranes. The bilayer membranes were made on the basis of single-layer profiled membranes by casting MF-4SK film on the profiled surfaces. The diffusion permeability of all types of single-layer and bilayer profiled membranes was higher than of the initial ones due to the appearance of large defects on their surface during pressing. The conductivity of the profiled membrane was lower in the diluted solution and higher in the concentrated solution than of the initial one for all samples except for the bilayer anion-exchange membrane. The conductivity of that sample was lower than that of the initial anion-exchange MA-41 membrane over the entire range of studied concentrations. The counter-ion transport numbers for all studied membranes were calculated based on the concentration dependences of conductivity and diffusion permeability of the membrane by the microheterogeneous model. The selectivity of single layer and bilayer profiled membranes became lower after their profiling due to the increase of the solution phases of membranes. The asymmetry of the current-voltage curves for all single-layer and bilayer profiled membranes was found. The application of the single layer and bilayer profiled membranes in reverse electrodialysis did not lead to an increase in power density.

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Recent advances in monovalent ion selective membranes towards environmental remediation and energy harvesting

Cited by 32 publications

References 216 publications

Advancing ion-exchange membranes to ion-selective membranes: principles, status, and opportunities

Advancing ion-exchange membranes to ion-selective membranes: principles, status, and opportunities

Improvement of Selectivity of RALEX-CM Membranes via Modification by Ceria with a Functionalized Surface

Profiled Ion-Exchange Membranes for Reverse and Conventional Electrodialysis

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