Functionalized nanoporous graphene membrane with ultrafast and stable nanofiltration

Kang, Junhyeok; Choi, Yunkyu; Kim, Ji Hoon; Choi, Eunji; Choi, Seung Eun; Kwon, Ohchan; Kim, Dae Woo

doi:10.1016/j.memsci.2020.118635

Cited by 48 publications

(29 citation statements)

References 46 publications

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“…At high temperatures, the oxygen-containing groups spontaneously decompose into CO 2 /CO gas, which expands the graphene sheet to form a hierarchical structure with abundant slit nanopores (middle image of Fig. 1 a) 32 , 35 . Simultaneously, nanopores can be generated on the basal plane of graphene, because the oxygen-containing groups are detached.…”

Section: Resultsmentioning

confidence: 99%

“…1 e. After thermal annealing, the d-spacing of ArGO (3.4 Å) decreased over that of GO powder (8.3 Å) because most oxygen-containing groups were removed by the high-temperature treatment. However, the diffraction peak of ArGO was broader than that of graphite because ArGO was mainly composed of amorphous sp 3 carbons, hindering the stacking of graphene sheets 32 , 35 , and a broad diffraction peak was observed regardless of the oxidation degree of GO (Fig. S3 a).…”

Section: Resultsmentioning

confidence: 99%

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Tuning the hierarchical pore structure of graphene oxide through dual thermal activation for high-performance supercapacitor

Kim

Eum

Kang

et al. 2021

Sci Rep

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Herein, we introduce a simple method to prepare hierarchical graphene with a tunable pore structure by activating graphene oxide (GO) with a two-step thermal annealing process. First, GO was treated at 600 °C by rapid thermal annealing in air, followed by subsequent thermal annealing in N2. The prepared graphene powder comprised abundant slit nanopores and micropores, showing a large specific surface area of 653.2 m2/g with a microporous surface area of 367.2 m2/g under optimized conditions. The pore structure was easily tunable by controlling the oxidation degree of GO and by the second annealing process. When the graphene powder was used as the supercapacitor electrode, a specific capacitance of 372.1 F/g was achieved at 0.5 A/g in 1 M H2SO4 electrolyte, which is a significantly enhanced value compared to that obtained using activated carbon and commercial reduced GO. The performance of the supercapacitor was highly stable, showing 103.8% retention of specific capacitance after 10,000 cycles at 10 A/g. The influence of pore structure on the supercapacitor performance was systematically investigated by varying the ratio of micro- and external surface areas of graphene.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Tuning the hierarchical pore structure of graphene oxide through dual thermal activation for high-performance supercapacitor

Kim

Eum

Kang

et al. 2021

Sci Rep

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“…This suggests that, although vacuum filtration can be exploited to readily stack various 2D materials, careful considerations must be made in selecting substrates, as the alignment of the sheets is affected by the morphology of the support. Kang et al prepared nanoporous rGO sheets by a rapid thermal treatment ( Figure 2 c) [ 24 ]. The nanoporous rGO sheets were dispersed in water by a secondary functionalization process before depositing on substrates by vacuum filtration.…”

Section: Small-scale Fabrication Techniquesmentioning

confidence: 99%

“…Copyright 2019 American Chemistry Society; ( b ) GO layer deposition on wrinkled substrates for high water flux [ 23 ]. Copyright 2019 Elsevier; ( c ) nanoporous GO sheet membranes for nanofiltration application [ 24 ]. Copyright 2021 Elsevier.…”

Section: Figurementioning

confidence: 99%

Fabrication Techniques for Graphene Oxide-Based Molecular Separation Membranes: Towards Industrial Application

Kwon

Choi

et al. 2021

Nanomaterials

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Graphene oxide (GO) has been a prized material for fabricating separation membranes due to its immense potential and unique chemistry. Despite the academic focus on GO, the adoption of GO membranes in industry remains elusive. One of the challenges at hand for commercializing GO membranes lies with large-scale production techniques. Fortunately, emerging studies have acknowledged this issue, where many have aimed to deliver insights into scalable approaches showing potential to be employed in the commercial domain. The current review highlights eight physical methods for GO membrane fabrication. Based on batch-unit or continuous fabrication, we have further classified the techniques into five small-scale (vacuum filtration, pressure-assisted filtration, spin coating, dip coating, drop-casting) and three large-scale (spray coating, bar/doctor blade coating, slot die coating) approaches. The continuous nature of the large-scale approach implies that the GO membranes prepared by this method are less restricted by the equipment’s dimensions but rather the availability of the material, whereas membranes yielded by small-scale methods are predominately limited by the size of the fabrication device. The current review aims to serve as an initial reference to provide a technical overview of preparing GO membranes. We further aim to shift the focus of the audience towards scalable processes and their prospect, which will facilitate the commercialization of GO membranes.

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“… 19 Kang et al re-oxidized rGO to make pores so that the membrane exhibited ultra-fast water permeability (586 L m −2 h −1 bar −1 ) and precise molecular sieving (MWCO: 269 Da). 20 Mi et al directly filled GO with functional groups with different molecular weights and electronegativity to control the gap between GO sheets. 21 Huang et al demonstrated the possibility of partially reduced GO membranes for water treatment, constructed reduced GO membranes through a hydrothermal reduction method, and they were illustrated that the retention of partial oxygen-containing groups is the key element for rGO film formation.…”

Section: Introductionmentioning

confidence: 99%

Optimizing graphene oxide membranes for effective removal of dyes by modulating the reduction degree and doped nitrogen

Bai

Huang

et al. 2022

RSC Adv.

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Functionalized nanoporous graphene membrane with ultrafast and stable nanofiltration

Cited by 48 publications

References 46 publications

Tuning the hierarchical pore structure of graphene oxide through dual thermal activation for high-performance supercapacitor

Tuning the hierarchical pore structure of graphene oxide through dual thermal activation for high-performance supercapacitor

Fabrication Techniques for Graphene Oxide-Based Molecular Separation Membranes: Towards Industrial Application

Optimizing graphene oxide membranes for effective removal of dyes by modulating the reduction degree and doped nitrogen

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