Thermally-induced pore size tuning of multilayer nanoporous graphene for organic solvent nanofiltration

Kang, Junhyeok; Choi, Yunkyu; Kim, Jeong Pil; Kim, Ji Hoon; Kim, Ju Yeon; Kwon, Ohchan; Kim, David Inhyuk; Kim, Dae Woo

doi:10.1016/j.memsci.2021.119620

Cited by 28 publications

(10 citation statements)

References 48 publications

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“…Although the theoretical basis has been established [56,57], creating nanopores with uniform pore size and high pore density remains a formidable challenge. The drilling techniques currently used to fabricate nanoporous graphene include ion bombardment [58], oxygen/hydrogen/argon plasma etching [59][60][61], ion beam irradiation, thermal annealing [62,63], etc. Electron beam irradiation can produce well-defined pore sizes, but cannot achieve efficient molecular separation due to its large pore size from 3.5 to 100 nm.…”

Section: Nanoporous Graphene Membranesmentioning

confidence: 99%

A Review of Advancing Two-Dimensional Material Membranes for Ultrafast and Highly Selective Liquid Separation

Zhang

Zheng

Yu³

et al. 2022

Nanomaterials

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Membrane-based nanotechnology possesses high separation efficiency, low economic and energy consumption, continuous operation modes and environmental benefits, and has been utilized in various separation fields. Two-dimensional nanomaterials (2DNMs) with unique atomic thickness have rapidly emerged as ideal building blocks to develop high-performance separation membranes. By rationally tailoring and precisely controlling the nanochannels and/or nanoporous apertures of 2DNMs, 2DNM-based membranes are capable of exhibiting unprecedentedly high permeation and selectivity properties. In this review, the latest breakthroughs in using 2DNM-based membranes as nanosheets and laminar membranes are summarized, including their fabrication, structure design, transport behavior, separation mechanisms, and applications in liquid separations. Examples of advanced 2D material (graphene family, 2D TMDs, MXenes, metal–organic frameworks, and covalent organic framework nanosheets) membrane designs with remarkably perm-selective properties are highlighted. Additionally, the development of strategies used to functionalize membranes with 2DNMs are discussed. Finally, current technical challenges and emerging research directions of advancing 2DNM membranes for liquid separation are shared.

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Section: Nanoporous Graphene Membranesmentioning

confidence: 99%

A Review of Advancing Two-Dimensional Material Membranes for Ultrafast and Highly Selective Liquid Separation

Zhang

Zheng

Yu³

et al. 2022

Nanomaterials

View full text Add to dashboard Cite

show abstract

“…The study of nanopore geometry has determined that the effective area of nanopores plays a critical role, and to better understand the influence of this parameter, the aspect ratio and equal diameter of noncircular pores are calculated based on different methods such as equal area, equal perimeter and hydraulic diameter for each case. In the case of non-circular nanopores, the results show that the aspect ratio and hydraulic diameter as well as the equal area method can adequately reflect the relevant trends, while the equal perimeter method is not able to correctly predict them [ 135 ].…”

Section: Graphene and Graphene Oxidementioning

confidence: 99%

Recent Advances on Membranes for Water Purification Based on Carbon Nanomaterials

et al. 2022

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Every year the problem of water purification becomes more relevant. This is due to the continuous increase in the level of pollution of natural water sources, an increase in the population, and sharp climatic changes. The growth in demand for affordable and clean water is not always comparable to the supply that exists in the water treatment market. In addition, the amount of water pollution increases with the increase in production capacity, the purification of which cannot be fully handled by conventional processes. However, the application of novel nanomaterials will enhance the characteristics of water treatment processes which are one of the most important technological problems. In this review, we considered the application of carbon nanomaterials in membrane water purification. Carbon nanofibers, carbon nanotubes, graphite, graphene oxide, and activated carbon were analyzed as promising materials for membranes. The problems associated with the application of carbon nanomaterials in membrane processes and ways to solve them were discussed. Their efficiency, properties, and characteristics as a modifier for membranes were analyzed. The potential directions, opportunities and challenges for application of various carbon nanomaterials were suggested.

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“…This excellent permeation is attributed to the widened interlayer spacing by turbostratic carbon, additional solvent pathways by dense nanopores, and relaxed free energy by high solvent affinity to IPA (Figure 5f). Following the first demonstration of membrane fabrication using activated graphene, Kang et al achieved pore tuning of NG by adjusting the activation temperature (Figure 6a) [61]. Because the decomposition of oxygen-functional groups is significant, and the etching of graphene edges is facilitated at higher temperatures, larger nanopores were observed above 550 • C, while mostly micropores were observed in activated graphene at 250 • C (Figure 6b-e).…”

Section: Multilayer Ng Laminatesmentioning

confidence: 99%

Recent Developments in Nanoporous Graphene Membranes for Organic Solvent Nanofiltration: A Short Review

et al. 2021

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Graphene-based membranes are promising candidates for efficient organic solvent nanofiltration (OSN) processes because of their unique structural characteristics, such as mechanical/chemical stability and precise molecular sieving. Recently, to improve organic solvent permeance and selectivity, nanopores have been fabricated on graphene planes via chemical and physical methods. The nanopores serve as an additional channel for facilitating ultrafast solvent permeation while filtering organic molecules by size exclusion. This review summarizes the recent developments in nanoporous graphene (NG)-based membranes for OSN applications. The membranes are categorized depending on the membrane structure: single-layer NG, multilayer NG, and graphene-based composite membranes hybridized with other porous materials. Techniques for nanopore generation on graphene, as well as the challenges faced and the perspectives required for the commercialization of NG membranes, are also discussed.

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Thermally-induced pore size tuning of multilayer nanoporous graphene for organic solvent nanofiltration

Cited by 28 publications

References 48 publications

A Review of Advancing Two-Dimensional Material Membranes for Ultrafast and Highly Selective Liquid Separation

A Review of Advancing Two-Dimensional Material Membranes for Ultrafast and Highly Selective Liquid Separation

Recent Advances on Membranes for Water Purification Based on Carbon Nanomaterials

Recent Developments in Nanoporous Graphene Membranes for Organic Solvent Nanofiltration: A Short Review

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