Optimizing functional layer of cation exchange membrane by three-dimensional cross-linking quaternization for enhancing monovalent selectivity

Pan, Jing; Zhao, Lei; Yu, Xiaoming; Dong, Jiajing; Liu, Lingling; Zhao, Xueting; Liu, Lifen

doi:10.1016/j.cclet.2021.08.121

Cited by 15 publications

(9 citation statements)

References 44 publications

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“…111 Due to the nature of PPy with hyper-cross-linked polymer networks, a novel strategy for the formation of threedimensional cross-linked functional layers was further proposed, as illustrated in Figure 13b. 123 The dense PPy layer exerted a great adverse effect on the migration of Mg 2+ , which resulted in an improved permselectivity of 2.07 (Na 2+ / Mg 2+ ). Gao et al 124 constructed a dense of poly(vinyl alcohol)/glutaraldehyde (PVA/GA) separation layer on the surface of a sulfonated poly(ether sulfone) membrane by surface cross-linking, which resulted in a substantial increase in Li + /Mg 2+ permselectivity but at the sacrifice of ion flux.…”

Section: Pore-sizementioning

confidence: 99%

“…Formation of the tight PPy layer on the membrane surface could hinder the migration of bulkier ions . Due to the nature of PPy with hyper-cross-linked polymer networks, a novel strategy for the formation of three-dimensional cross-linked functional layers was further proposed, as illustrated in Figure b . The dense PPy layer exerted a great adverse effect on the migration of Mg 2+ , which resulted in an improved permselectivity of 2.07 (Na 2+ /Mg 2+ ).…”

Section: Process and Membrane Materials Innovations Of Edmentioning

confidence: 99%

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Developmental Progress of Electrodialysis Technologies and Membrane Materials for Extraction of Lithium from Salt Lake Brines

et al. 2023

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Salt lake brines have become the main source of lithium owing to their abundant reserves and low extraction costs. The low absolute concentration of Li+ and the complexity of accompanying ions in the brines are crucial issues, thereby inspiring the development of a variety of lithium extraction technologies. Among them, electrodialysis (ED) enables acceptable separation performance, reduced energy consumption, and near-zero pollution toward salt lake brines with a high Mg2+/Li+ mass ratio. Most recently, the rapid advancement of integrated ED technologies and emerging strategies for membrane material fabrications are conducive to facilitating the implementation of this technology. The newly proposed processes can achieve higher energy utilization and enhance the concentration of lithium salt products. For membrane materials, the superior permselectivity between lithium and magnesium is still the current pursuit. The key metrics for developing membranes involve tuning the materials’ hydrophilicity, pore size, and charge. Among them, due to the rise of lithium-specific recognition materials, it is believed that coupling them with ED technology to achieve efficient and precise extraction of lithium will be the future development direction.

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Section: Pore-sizementioning

confidence: 99%

Section: Process and Membrane Materials Innovations Of Edmentioning

confidence: 99%

Developmental Progress of Electrodialysis Technologies and Membrane Materials for Extraction of Lithium from Salt Lake Brines

et al. 2023

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“…used (2,6-dimethyl-1,4-phenylene oxide) (QPPO) to form a thin separating layer on the surface of SPPO-PVA (SPVA) dense membrane, leading to repulsion of divalent cations and optimal permeation of monovalent cations. However, it remained a challenge to maintain the stability of the surface functional layer and substrate membrane matrix. − Therefore, exploring different strategies to enhance the stability of the selectivity layer or design the internal-blocking sites/artificial ion channels is of great practical significance. − …”

Section: Introductionmentioning

confidence: 99%

Cation Exchange Membrane with Internal-Blocking Sites for Mono/Multivalent Ion Separation

Zhao,

Sun,

Zhao

et al. 2024

ACS EST Water

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In this work, monovalent cation perm-selective membranes (MCPMs) with multiple internal-blocking sites were designed to enhance the Donnan effect and size-based exclusion effect. Polypyrrole (PPy), as the internal-blocking sites for ion transport, was introduced within the membrane matrix by in situ polymerization, which was prominent to mono-and multivalent ion separation in electrodialysis (ED). The precise growth of the internal-blocking sites was manipulated via optimization of the polymerization time and polymerization steps. The optimized SPPSU@3PPy membrane exhibits excellent separation performance: the SPPSU@3PPy membrane demonstrates perm-selectivity for Na + /Mg 2+ (PNa Mg = 2.08) and a higher Na + flux (J Na + = 3.29 × 10 −8 mol cm −2 s −1 ). This in situ polymerization method to fabricate internal-blocking sites in a cation exchange membrane is a potential pathway to construct MCPMs.

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“…34 Several studies have provided insights into the use of polyelectrolyte-assembled membranes for electrodialysis, demonstrating their great potential for more efficient mono/multivalent ion separation compared with conventional IEMs. 3,[35][36][37] However, very few studies have revealed the underlying mechanism that governs the role of each polyelectrolytestacked layer in the specific ion transport functionality. Some MD simulations have shown the superior transport selectivity of monovalent ions compared with multivalent ions within sub-nanoscale channels.…”

Section: Introductionmentioning

confidence: 99%

“…With these unique features, self‐assembled polyelectrolyte membranes exhibit several conceptual advantages: (1) polyelectrolyte self‐assembly enables universal and convenient membrane chemistry tailoring through the rational screening of linkers and linkages, 33 and (2) intriguing polyelectrolyte self‐assembly individually confers diverse membrane versatility for targeted ion separation 34 . Several studies have provided insights into the use of polyelectrolyte‐assembled membranes for electrodialysis, demonstrating their great potential for more efficient mono/multivalent ion separation compared with conventional IEMs 3,35–37 . However, very few studies have revealed the underlying mechanism that governs the role of each polyelectrolyte‐stacked layer in the specific ion transport functionality.…”

Section: Introductionmentioning

confidence: 99%

The role of ion‐membrane interactions in fast and selective mono/multivalent ion separation with hierarchical nanochannels

Zhang,

Lin,

Zhang

et al. 2023

AIChE Journal

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Precise control over the nanofluid behavior of polyelectrolyte‐based membranes is a primary step toward understanding the structure‐morphology‐property relationships to ultimately determine the mass transfer characteristics. In this study, a high‐performance multistacked polyelectrolyte‐based cation exchange membrane (CEM) with a heterogeneous structure and versatile surface chemistry was developed to achieve selective ion conductance. The self‐assembled CEM can facilitate ion permeation with fluxes of 2.9 mol m−2 h−1 for K+ and 0.22 mol m−2 h−1 for Mg2+, reaching a mono/multivalent ionic selectivity of up to 13, outperforming mono/divalent fractionation when compared with state‐of‐the‐art membranes. Molecular dynamic (MD) simulations illustrated the ionic transport trajectory in hierarchical channels with angstrom‐scale cavities using multilayered CEMs. Both the experimental measurements and theoretical simulations indicated that ionic fractionation was associated with a large disparity in the energy barrier between mono/multivalent cations, which was the primary origin of the differences in the ion dehydration‐rehydration processes in the angstrom‐confinement membrane ion channels.

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Optimizing functional layer of cation exchange membrane by three-dimensional cross-linking quaternization for enhancing monovalent selectivity

Cited by 15 publications

References 44 publications

Developmental Progress of Electrodialysis Technologies and Membrane Materials for Extraction of Lithium from Salt Lake Brines

Developmental Progress of Electrodialysis Technologies and Membrane Materials for Extraction of Lithium from Salt Lake Brines

Cation Exchange Membrane with Internal-Blocking Sites for Mono/Multivalent Ion Separation

The role of ion‐membrane interactions in fast and selective mono/multivalent ion separation with hierarchical nanochannels

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