Enhancement of the Donnan effect through capacitive ion increase using an electroconductive rGO-CNT nanofiltration membrane

Hu, Chengzhi; Liu, Zhongtao; Lu, Xinglin; Sun, Jingqiu; Liu, Huijuan; Qu, Jiuhui

doi:10.1039/c7ta11003k

Cited by 81 publications

(33 citation statements)

References 57 publications

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“…With voltage shifting from 0 to −0.5 V, the flux of salts was enhanced by a factor of up to 7 (Figure c). The enhancement was however, opposite to their theoretical prediction that increased external potential would build up higher membrane potential to repel more co‐ions and consequently slow down overall salt passage . This contradiction is ascribed to the short‐ranged, non‐Coulombic correlation existing between co‐ and counter‐ions .…”

Section: Transport‐controlling Effectscontrasting

confidence: 62%

2D Laminar Membranes for Selective Water and Ion Transport

Kang

Xia

Wang

et al. 2019

Adv Funct Materials

227

148

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energy storage and conversion devices, [26][27][28] as outlined in recent reviews (Figure 1, left). [29] Behind these applications lie a fundamental question: how water and ion transport are controlled in the laminar structure to obtain desired selectivity. A comprehensive summary of structure-transport relation is thereby imperative to understand and optimize membrane selective performance, but is so far lacking. In such context, our review aims to fill this gap by discussing: 1) how 2D materials with specific physicochemical features are assembled into laminar membranes; 2) most importantly, how membrane structure, and its response to external impacts, can tune mass transport (herein, water and ions); 3) how these transport mechanisms translate into selectivity in applications, and into future design of high-performance laminar membranes. Unsolved problems and emerging challenges around these topics are then concluded. We note that the knowledge summarized here can also, at least partly, assist the understanding of the selective gas, liquid, and micromolecule transport through laminar membranes, which are gaining considerable attention as well. [30][31][32] Transition Metal Carbides and/or Nitrides (MXene): MXene nanosheets are etched and delaminated from parent bulk MAX to M n+1 X n T x (e.g., Ti 3 C 2 T x ), and have thus several atom sublayers. [39] While M and X are early transition metal

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Section: Transport‐controlling Effectscontrasting

confidence: 62%

2D Laminar Membranes for Selective Water and Ion Transport

Kang

Xia

Wang

et al. 2019

Adv Funct Materials

227

148

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“…It was known that the membrane rejection property was based on both size sieving effect and Donnan effect. 41 The hydrated diameters of the salt ions were Mg 2+ (0.86 nm) > Na + (0.72 nm), SO 4 2À (0.76 nm) > Cl À (0.66 nm). 42 All the membranes showed negatively zeta potential and thus could repulse the same charged SO 4 2À and Cl À , but the divalent ions were easy to be rejected than monovalent ions due to the stronger electronegativity and larger hydrated diameter.…”

Section: Nanoltration Performance Of the Prepared Membranesmentioning

confidence: 92%

Enhanced dispersibility of metal–organic frameworks (MOFs) in the organic phaseviasurface modification for TFN nanofiltration membrane preparation

et al. 2020

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“…Firstly, previous studies have shown that Gibbs-Donnan exclusion can be augmented by modifying the surface charge of nanofiltration membranes to improve membrane selectivity in aqueous solutions. [132][133][134] separation, the chemical functionalization of 2D materials can create similar Gibbs-Donnan exclusion effects. [80,135] However, the current results are not always consistent.…”

Section: Mechanisms Of Molecular Transport and Sieving Capacitymentioning

confidence: 99%

2D Material Based Advanced Membranes for Separations in Organic Solvents

Sui

Yuan

et al. 2020

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2D materials have shown high potentials for fabricating next‐generation membranes. To date, extensive studies have focused on the applications of 2D material membranes in gas and aqueous media. Recently, compelling opportunities emerge for 2D material membranes in separation applications in organic solvents because of their unique properties, such as ultrathin mono‐ to few‐layers, outstanding chemical resistance toward organic solvents. Hence, this review aims to provide a timely overview of the current state‐of‐the‐art of 2D material membranes focusing on their applications in organic solvent separations. 2D material membranes fabricated using graphene materials and a few representative nongraphene‐based 2D materials, including covalent organic frameworks and MXenes, are summarized. The key membrane design strategies and their effects on separation performances in organic solvents are also examined. Last, several perspectives are provided in terms of the critical challenges for 2D material membranes, including standardization of membrane performance evaluation, improving understandings of separation mechanisms, managing the trade‐off of permeability and selectivity, issues related to application versatility, long‐term stability, and fabrication scalability. This review will provide a useful guide for researchers in creating novel 2D material membranes for advancing new separation techniques in organic solvents.

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Enhancement of the Donnan effect through capacitive ion increase using an electroconductive rGO-CNT nanofiltration membrane

Abstract: Enhanced Donnan repulsion through increase in capacitive ions contributes to the remarkable salt rejection ability of the GCM under electrochemical assistance.

Cited by 81 publications

References 57 publications

2D Laminar Membranes for Selective Water and Ion Transport

2D Laminar Membranes for Selective Water and Ion Transport

Enhanced dispersibility of metal–organic frameworks (MOFs) in the organic phaseviasurface modification for TFN nanofiltration membrane preparation

2D Material Based Advanced Membranes for Separations in Organic Solvents

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