Ionic Transport Properties of Cation-Exchange Membranes Prepared from Poly(vinyl alcohol-b-sodium Styrene Sulfonate)

Kakihana, Yuriko; Hashim, N. Awanis; Mizuno, Taiko; Anno, Marika; Higa, Mitsuru

doi:10.3390/membranes11060452

Cited by 3 publications

(4 citation statements)

References 39 publications

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“…1g ). The K + transference number was much higher than that of polymers without ion exchange groups reported recently (0.78 for Cu 2+ -coordinated cellulose) 18 , which was comparable to that of cation exchange membranes (nearly 1) 25 , 26 . In contrast, the Fe-PBI membrane with disordered coordination network exhibited a t + value of 0.5, which was almost the same as the t + in the bulk solution, confirming the poor selectivity in Fe-PBI.…”

Section: Resultscontrasting

confidence: 41%

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Metal-coordinated polybenzimidazole membranes with preferential K+ transport

Liao

et al. 2023

Nat Commun

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Membranes with fast and selective ion transport are essential for separations and electrochemical energy conversion and storage devices. Metal-coordinated polymers are promising for fabricating ion-conducting membranes with molecular channels, however, the structures and ion transport channels remain poorly understood. Here, we reported mechanistic insights into the structures of metal-ion coordinated polybenzimidazole membranes and the preferential K+ transport. Molecular dynamics simulations suggested that coordination between metal ions and polybenzimidazole expanded the free volume, forming subnanometre molecular channels. The combined physical confinement in nanosized channels and electrostatic interactions of membranes resulted in a high K+ transference number up to 0.9 even in concentrated salt and alkaline solutions. The zinc-coordinated polybenzimidazole membrane enabled fast transport of charge carriers as well as suppressed water migration in an alkaline zinc-iron flow battery, enabling the battery to operate stably for over 340 hours. This study provided an alternative strategy to regulate the ion transport properties of polymer membranes by tuning polymer chain architectures via metal ion coordination.

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Section: Resultscontrasting

confidence: 41%

“…1f ). The K + transference number in Zn-PBI was as high as 0.91, which was higher than that of polymers free of ion exchange groups 18 , and comparable to cation exchange membranes (nearly 1) 25 , 26 (Fig. 1g ).…”

Section: Introductionmentioning

confidence: 82%

Metal-coordinated polybenzimidazole membranes with preferential K+ transport

Liao

et al. 2023

Nat Commun

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“…C-2/A-2 and FKS-20/FAS-20 exhibited low-area-resistance. Membrane properties were measured in the same way as previously described [28,29]. The basic properties of the membranes used in this study are listed in Table 1.…”

Section: Membranesmentioning

confidence: 99%

Power Generation Performance of Reverse Electrodialysis (RED) Using Various Ion Exchange Membranes and Power Output Prediction for a Large RED Stack

Ujike

Higa

et al. 2022

Membranes

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Reverse electrodialysis (RED) power generation using seawater (SW) and river water is expected to be a promising environmentally friendly power generation system. Experiments with large RED stacks are needed for the practical application of RED power generation, but only a few experimental results exist because of the need for large facilities and a large area of ion-exchange membranes (IEMs). In this study, to predict the power output of a large RED stack, the power generation performances of a lab-scale RED stack (40 membrane pairs and 7040 cm2 total effective membrane area) with several IEMs were evaluated. The results were converted to the power output of a pilot-scale RED stack (299 membrane pairs and 179.4 m2 total effective membrane area) via the reference IEMs. The use of low-area-resistance IEMs resulted in lower internal resistance and higher power density. The power density was 2.3 times higher than that of the reference IEMs when natural SW was used. The net power output was expected to be approximately 230 W with a pilot-scale RED stack using low-area-resistance IEMs and natural SW. This value is one of the indicators of the output of a large RED stack and is a target to be exceeded with further improvements in the RED system.

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“…They are classified, according to the fixed functional groups, into cation-exchange and anion-exchange membranes [ 16 ]. Cation-exchange membranes (CEMs) have negatively charged groups that allow the transportation of cations while rejecting anions [ 17 ]. The most common functional groups fixed to the CEMs are –SO 3 − , –COO − , –PO 3 2− , and –PO 3 H − [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

Multifunctional Heterogeneous Ion-Exchange Membranes for Ion and Microbe Removal in Low-Salinity Water

et al. 2023

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Here, multifunctional heterogeneous ion-exchange metal nanocomposite membranes were prepared for surface water desalination and bacterial inactivation under low-pressure (0.05 MPa) filtration conditions. Ultrafiltration (UF) heterogeneous ion exchange membranes (IEMs) were modified with different concentrations of AgNO3 and CuSO4 solutions using the intermatrix synthesis (IMS) technique to produce metal nanocomposite membranes. Scanning electron microscopy (SEM) images revealed that the metal nanoparticles (MNPs) (Ag and Cu) were uniformly distributed on the surface and the interior of the nanocomposite membranes. With increasing metal precursor solution concentration (0.01 to 0.05 mol·L−1), the metal content of Ag and Cu nanocomposite membranes increased from 0.020 to 0.084 mg·cm−2 and from 0.031 to 0.218 m·cm−2 respectively. Results showed that the hydrodynamic diameter diameters of Ag and Cu nanoparticles (NPs) increased from 62.42 to 121.10 nm and from 54.2 to 125.7 nm respectively, as the metal precursor concentration loaded increased. The leaching of metals from metal nanocomposite membranes was measured in a dead-end filtration system, and the highest leaching concentration levels were 8.72 ppb and 5.32 ppb for Ag and Cu, respectively. The salt rejection studies indicated that ionic selectivity was improved with increasing metal content. Bacterial filtration showed higher antibacterial activity for metal nanocomposite membranes, reaching 3.6 log bacterial inactivation.

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Ionic Transport Properties of Cation-Exchange Membranes Prepared from Poly(vinyl alcohol-b-sodium Styrene Sulfonate)

Cited by 3 publications

References 39 publications

Metal-coordinated polybenzimidazole membranes with preferential K+ transport

Metal-coordinated polybenzimidazole membranes with preferential K+ transport

Power Generation Performance of Reverse Electrodialysis (RED) Using Various Ion Exchange Membranes and Power Output Prediction for a Large RED Stack

Multifunctional Heterogeneous Ion-Exchange Membranes for Ion and Microbe Removal in Low-Salinity Water

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