Effective NaCl and dye rejection of hybrid graphene oxide/graphene layered membranes

Morelos-Gómez, Aarón; Cruz-Silva, Rodolfo; Muramatsu, Hiroyuki; Ortiz‐Medina, Josué; Araki, Takumi; Fukuyo, Tomoyuki; Tejima, Syogo; Takeuchi, Kenji; Hayashi, T.; Terrones, Mauricio; Endo, Morinobu

doi:10.1038/nnano.2017.160

Cited by 348 publications

(206 citation statements)

References 38 publications

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“…However,s ome approaches for fabricating graphene-based membranes have been reported using casting or spray-coating,m ethods appropriate for membrane manufacturing ( Figure 3). [21] AG O/FLG layer with at hickness of 26-33 nm was formed on the poly(vinyl alcohol) (PVA)-coated polysulfone substrate,f ollowed by thermal treatment at 100 8 8Ca nd Ca 2+ crosslinking with CaCl 2 solution;t he resulting hybrid layer endured high-pressure water treatment at 50 bar. [20] Viscoelastic GO ink, which was concentrated from aG O aqueous dispersion by the addition of hydrogel beads,w as cast on ap olymer substrate such that the nematic phase of GO was aligned forming ahighly ordered layer.…”

Section: Graphene-based Materialsmentioning

confidence: 99%

“…A) Fabrication of shear-aligned membrane from nematic GO ink. [21] Copyright2 016, 2017, Springer Nature. [21] Copyright2 016, 2017, Springer Nature.…”

Section: D Metal-organic Framework Materialsmentioning

confidence: 99%

“…Them embrane thickness was controlled from 20 nm to 500 nm and the membrane with 100 nm thickness demonstrated aw ater flux of around 25 Lm À2 h À1 .Moreover,rGO membranes presented much lower ion permeability than GO membranes or commercial cellulose triacetate membranes.C hemical crosslinking of GO with PA is the way to develop desalination membranes because PA is widely used for membrane desalination processes.J in et al introduced crosslinking of GO with diamine and trimethyl chloride monomers by using amide-bonding between the acid groups on the GO and the amide groups of the crosslinker,a nd inter-crosslinking between parallel GO nanosheets was achieved by formation of aP Astructure. [21] TheN aCl rejection mechanism is due to Gibbs-Donnan exclusion by the surface functional groups of GO and DOC,a nd the zwitterionic behavior by the combination of Ca 2+ and DOC. The membrane prepared on an ylon substrate by spin-coating, with athickness of less than 40 nm, demonstrated awater flux of 25.8 Lm À2 h À1 and NaCl rejection of 99.9 %i nt he FO process.…”

Section: Water Desalinationmentioning

confidence: 99%

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

2019

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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.

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Section: Graphene-based Materialsmentioning

confidence: 99%

“…A) Fabrication of shear-aligned membrane from nematic GO ink. [21] Copyright2 016, 2017, Springer Nature. [21] Copyright2 016, 2017, Springer Nature.…”

Section: D Metal-organic Framework Materialsmentioning

confidence: 99%

Section: Water Desalinationmentioning

confidence: 99%

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

2019

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“…The highly ordered GO membranes formed organized channels and demonstrated outstanding water permeability. Another alternative method is spray coating GO aqueous dispersion and few-layered graphene to yield robust membranes that are easy and scalable to produce [7]. The hybrid layered membranes maintained effective NaCl rejection near 85% and 96% for an anionic dye.…”

Section: Graphene-based Membranes For Organic Solvent Nanofiltrationmentioning

confidence: 99%

“…As for the water transport mechanism within atomic-scale capillaries, the unexpectedly fast flow (up to 1 m s −1 ) was achieved, which was attributed to the enhanced structural order, high capillary pressure, and large slip length [10]. To improve graphene-based membranes for a prolonged period operation, polyvinyl alcohol interfacial adhesive layer was introduced between graphene and support membrane, which dramatically contributed to a steady performance for up to 120 h under intense cross-flow [7]. HIGHLIGHTS .…”

Section: Graphene-based Membranes For Organic Solvent Nanofiltrationmentioning

confidence: 99%

Graphene-based membranes for organic solvent nanofiltration

Zhu

2018

Sci. China Mater.

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Different from the conventional polymeric separation membranes having a wide flexible-pore size distribution, layered graphene-based films with interconnected nanochannels provide narrowly well-defined nanopore-size distribution and thus are extremely advantageous for precise liquid filtration and separation. Recently, considerable progress has been achieved in graphene-based membranes for molecular sieving in water. For example, it was found that sub-micrometer-thick graphene oxide (GO) membranes were almost impermeable to liquids, vapors, or gases but allowed unimpeded permeation of water [1] because of the nearly frictionless flow of water molecules through the two-dimensional hydrophobic nonoxidized capillaries. Moreover, it was further demonstrated that GO membranes could act as molecular sieves to block all solutes with hydrated radii > 0.45 nm when immersed in water [2], in which size exclusion appears to account for this behavior. For smaller sizefitted solutes that can enter in nanochannels, GO membrane could achieve more accurate ion selectivity via the diverse interactions between ions and sp 2 clusters or oxygen-containing functional groups on GO basal planes [3].The findings mentioned above implicate that GO membranes are extremely promising for a broad spectrum of separation due to their tunability in pore size to remove various target solutes, including expansion by inserting large spacers and decrease by reducing, crosslinking, etc. [4]. Consequently, most existing studies focused on the adjustment of pore structure for high flux and retention. The representative novel nanostrandchanneled GO membrane exhibited 10-time higher permeance than the conventional polymeric separation membranes [5]. However, graphene-based membranes confronted with some crucial challenges in practical industrial applications, such as scale-up of membranes to large-area, the narrow interlayer spacing in water for highly effective desalination, molecular transport mechanism confined in nanocapillaries, stability in water for long periods of time, especially graphene-based membranes used for organic solvent nanofiltration (OSN).Over the past two years, some successes have been achieved in these aspects. Large-area GO membranes were accessible by an industrially adaptable method of blade coating, which aligned the discotic nematic phase of GO on a porous support [6]. The highly ordered GO membranes formed organized channels and demonstrated outstanding water permeability. Another alternative method is spray coating GO aqueous dispersion and few-layered graphene to yield robust membranes that are easy and scalable to produce [7]. The hybrid layered membranes maintained effective NaCl rejection near 85% and 96% for an anionic dye. The achievement of 97% high rejection for NaCl is a significant breakthrough due to the controllable limited swelling of GO laminates in water [8]. The ion permeation rates were found to decrease exponentially with decreasing sieve size because of dehydration effects whereas water transport was sligh...

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Graphene‐Based Membranes for Nanofiltration

Jin

2021

Nanofiltration

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Effective NaCl and dye rejection of hybrid graphene oxide/graphene layered membranes

Cited by 348 publications

References 38 publications

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

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

Graphene-based membranes for organic solvent nanofiltration

Graphene‐Based Membranes for Nanofiltration

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