2D Nanosheets and Their Composite Membranes for Water, Gas, and Ion Separation

Abstract

Two‐dimensional nanosheets have shown great potential for separation applications because of their exceptional molecular transport properties. Nanosheet materials such as graphene oxides, metal–organic frameworks, and covalent organic frameworks display unique, precise, and fast molecular transport through nanopores and/or nanochannels. However, the dimensional instability of nanosheets in harsh environments diminishes the membrane performance and hinders their long‐term operation in various applications such as gas separation, water desalination, and ion separation. Recent progress in nanosheet membranes has included modification by crosslinking and functionalization that has improved the stability of the membranes, their separation functionality, and the scalability of membrane formation while the membranes’ excellent molecular transport properties are retained. These improvements have enhanced the potential of nanosheet membranes in practical applications such as separation processes.

Photothermal‐Responsive Microporous Nanosheets Confined Ionic Liquid for Efficient CO2 Separation

“…The small thickness of 2.4 nm, large lateral size and plenty of in-plane pores make Zr-Fc MOF nanosheet an ideal candidate for membrane fabrication. [44][45][46] Thus, a Zr-Fc MOF membrane was fabricated by the vacuum filtration method using polycarbonate (PC, Whatman, 200 nm) as a substrate. Thanks to the ultra-thin characteristic, a compact and continuous Zr-Fc MOF membrane is easily formed on the PC (Figure 2a).…”

MXene Materials for Designing Advanced Separation Membranes

“…As separation membranes are closely related to thin films and composite materials, the discussions provided in some of those reviews hinted at the preparation of MXene-based membranes. However, only a couple of reviews [9,[41][42][43][44][45][46][47] examined MXene-based separation membranes, albeit as a part of general discussions on the MXene applications or 2DM-based membranes (see Table S1 in the Supporting Information). Hence, no dedicated report has yet to discuss the current In the Singapore Membrane Technology Centre (postdoctoral fellow) and The University of Sydney (visiting scholar), he focused on polymer-based membrane contactors, nanosheet-based separation membranes, and antibacterial and antibiofouling materials.…”

A Sm-MOF/GO nanocomposite membrane for efficient organic dye removal from wastewater

“…In recent decades, the membrane separation technology has been proven to be a promising approach to address the issue of environmental contaminants. [8][9][10] Compared to the traditional separation technology, membrane separation is more energy saving, easier to operate, and does not produce secondary pollution during the efficient separation of pollutant emissions; thus, it has great potential in the separation of water contaminants and water purication. [11][12][13] As a two-dimensional nanomaterial researched widely in membrane separation, graphene oxide (GO) has been considered a strong competitor for liquid separation owing to its monoatomic thickness, lamellar structure, good membraneforming ability, excellent mechanical strength and exibility, and easy mass production characteristics.…”