Two‐Dimensional‐Material Membranes: A New Family of High‐Performance Separation Membranes

Liu, Gongping; Jin, Wanqin; Xu, Nanping

doi:10.1002/anie.201600438

Cited by 641 publications

(311 citation statements)

References 95 publications

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“…[1] At present, high permeance of lamellar membranes can be achieved by reducing membrane thickness and/or expanding channel spacing. Tw o-dimensional (2D) lamellar membranes have attracted al ot of attention due to their numerous advantages such as ultrafast molecular transfer, robust chemical stability,a nd facile control of channel size.…”

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confidence: 99%

A Regularly Channeled Lamellar Membrane for Unparalleled Water and Organics Permeation

et al. 2018

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Lamellar membranes show exceptional molecular permeation properties of key importance for many applications. However, their design and development need the construction of regular and straight interlayer channels and the establishment of corresponding transport rate equation. The fabrication of a uniformly lamellar membrane is reported using double-layered Ti C T MXenes as rigid building blocks. This membrane possesses ordered and straight 2 nm channels formed via a direct self-stacking, in contrast to the conventional irregular ones from flexible sheets. Such channels permit precise molecular rejection and unparalleled molecular permeation. The permeance of water and organics by this membrane reached 2300 and 5000 L m h bar , respectively. The molecular transfer mechanism in confined nanochannels, and the corresponding model equation are established, paving a way to nanoscale design of highly efficient channeled membranes for transport and separation applications.

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confidence: 99%

A Regularly Channeled Lamellar Membrane for Unparalleled Water and Organics Permeation

et al. 2018

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“…The performance of a membrane is mainly governed by the structure of its pores and the physicochemical properties of the material. Extensive efforts have been applied both in modifying traditional materials and in exploring new membrane materials/processes . GO nanosheets can be mass‐produced through chemical oxidization of graphite powder, and contain plenty of oxygen‐containing groups on the edges and basal planes.…”

Section: Unimpeded Water Transportmentioning

confidence: 99%

Water Adsorption and Transport on Oxidized Two‐Dimensional Carbon Materials

Yan

Xue

et al. 2019

Chemistry A European J

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Studies on the adsorption and transport of water molecules with oxidized two‐dimensional (2 D) carbon materials have attracted increasing interest owing to their wide range of applications, such as sensing, energy conversion, and membrane separation. In this contribution, the interaction between water molecules and oxidized 2 D carbon materials (i.e., graphene oxide and graphdiyne oxide) is discussed, the influence of water adsorption and transport on the physicochemical properties of 2 D carbon materials is presented, and the recent progress on oxidized 2 D carbon material‐based proton conduction, electricity generation, water transport, and humidity sensing is highlighted. The opportunities and challenges in these research fields are discussed, especially the structural stability and chemical modification of 2 D carbon materials.

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“…However, these were rare events and a fraction with a large and quantifiable number of monolayers could never be provided . Covalently bonded, strong and large all‐carbon sheets such as 2D‐P‐ 1 are attractive for applications as novel membrane materials for gas and ion separation . This explains the strong need for a substantially improved exfoliation process that provides monolayer‐rich and quantifiable fractions of 2D polymers, which initially are often obtained in single crystalline stacked form …”

Section: Introductionmentioning

confidence: 99%

Enriching and Quantifying Porous Single Layer 2D Polymers by Exfoliation of Chemically Modified van der Waals Crystals

Lange

Synnatschke

et al. 2020

Angewandte Chemie

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2D polymer sheets with six positively charged pyrylium groups at each pore edge in a stacked single crystal can be transformed into a 2D polymer with six pyridines per pore by exposure to gaseous ammonia. This reaction furnishes still a crystalline material with tunable protonation degree at regular nano‐sized pores promising as separation membrane. The exfoliation is compared for both 2D polymers with the latter being superior. Its liquid phase exfoliation yields nanosheet dispersions, which can be size‐selected using centrifugation cascades. Monolayer contents of ≈30 % are achieved with ≈130 nm sized sheets in mg quantities, corresponding to tens of trillions of monolayers. Quantification of nanosheet sizes, layer number and mass shows that this exfoliation is comparable to graphite. Thus, we expect that recent advances in exfoliation of graphite or inorganic crystals (e.g. scale‐up, printing etc.) can be directly applied to this 2D polymer as well as to covalent organic frameworks.

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Two‐Dimensional‐Material Membranes: A New Family of High‐Performance Separation Membranes

Cited by 641 publications

References 95 publications

A Regularly Channeled Lamellar Membrane for Unparalleled Water and Organics Permeation

A Regularly Channeled Lamellar Membrane for Unparalleled Water and Organics Permeation

Water Adsorption and Transport on Oxidized Two‐Dimensional Carbon Materials

Enriching and Quantifying Porous Single Layer 2D Polymers by Exfoliation of Chemically Modified van der Waals Crystals

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