Confined lamellar channels structured by multilayer graphene for high-efficiency desalination

Gao, Haiqi; Wang, Jing; Zhang, Xirui; Hu, Mingao; Xu, Qiu; Xie, Yannan; Liu, Yuzhen; Lu, Ruifeng

doi:10.1016/j.desal.2022.115681

Cited by 20 publications

(15 citation statements)

References 55 publications

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“…By comparing with some other lamellar channel-based membranes constructed by graphene, 53 MoS 2 , 54 fluorinated graphene 55 and phosphorene, 56 the boridene membrane shows a slightly weaker water flux during desalination. However, the boridene membrane exhibits a comparable performance with the boron nitride lamellar membrane.…”

Section: Resultsmentioning

confidence: 97%

Efficient seawater desalination in lamellar nanochannel-based boridene filtration membrane

2023

Phys. Chem. Chem. Phys.

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Section: Resultsmentioning

confidence: 97%

Efficient seawater desalination in lamellar nanochannel-based boridene filtration membrane

2023

Phys. Chem. Chem. Phys.

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“…Periodic boundary conditions were adopted in the width and height directions ( y - and z -axis) during the simulation. For comparison purposes, a multilayer graphene-based nanochannel [ 56 ], with a similar geometrical parameter, was also constructed ( Figure 1 b), i.e., the graphene has nine layers, with a length and width of about 40 × 30 Å 2 . The channel height is kept the same as the diamond nanochannel at 6.8 Å, i.e., the distance between carbon atoms in the upper and bottom multilayer graphene (with an effective distance of 3.4 Å, considering the van der Waal radius of C as 1.7 Å).…”

Section: Methodsmentioning

confidence: 99%

Atomistic Simulations of the Permeability and Dynamic Transportation Characteristics of Diamond Nanochannels

Dong

Shi

et al. 2022

Nanomaterials

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Through atomistic simulations, this work investigated the permeability of hexagonal diamond nanochannels for NaCl solution. Compared with the multilayer graphene nanochannel (with a nominal channel height of 6.8 Å), the diamond nanochannel exhibited better permeability. The whole transportation process can be divided into three stages: the diffusion stage, the transition stage and the flow stage. Increasing the channel height reduced the transition nominal pressure that distinguishes the diffusion and flow stages, and improved water permeability (with increased water flux but reduced ion retention rate). In comparison, channel length and solution concentration exerted ignorable influence on water permeability of the channel. Further simulations revealed that temperature between 300 and 350 K remarkably increased water permeability, accompanied by continuously decreasing transition nominal pressure. Additional investigations showed that the permeability of the nanochannel could be effectively tailored by surface functionalization. This work provides a comprehensive atomic insight into the transportation process of NaCl solution in a diamond nanochannel, and the established understanding could be beneficial for the design of advanced nanofluidic devices.

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“…8 Attempts were made by (1) organic phase; 9 (2) improving the hydrophilicity of the barrier layer by the introduction of functional groups; 10 (3) increasing the permeability of the barrier layer by nanomaterials; 11 and (4) decreasing the degree of cross-linking of the barrier layer by post-treatments to improve the permeation flux of the RO membrane to a certain extent by changing the structure of the polyamide barrier layer. 12 The concept of water channels was successfully introduced into the designation of RO membranes through aquaporin proteins, 13,14 carbon nanotubes, 15 liquid crystal phase, 16 zeolites, 17 graphene sheets, 18,19 and synthetic molecules, 20 wherein water molecules pass through confined channels and other species such as sodium ions are excluded. Single-walled carbon nanotubes with carboxylated ends were partially aligned and served as artificial water channels to be incorporated into the polyamide barrier layer to enhance the desalination efficiency of RO membranes.…”

Section: Introductionmentioning

confidence: 99%

“…The concept of water channels was successfully introduced into the designation of RO membranes through aquaporin proteins, , carbon nanotubes, liquid crystal phase, zeolites, graphene sheets, , and synthetic molecules, wherein water molecules pass through confined channels and other species such as sodium ions are excluded. Single-walled carbon nanotubes with carboxylated ends were partially aligned and served as artificial water channels to be incorporated into the polyamide barrier layer to enhance the desalination efficiency of RO membranes .…”

Section: Introductionmentioning

confidence: 99%

High-Flux Nanofibrous Composite Reverse Osmosis Membrane Containing Interfacial Water Channels for Desalination

Wang

et al. 2023

ACS Appl. Mater. Interfaces

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A nanofibrous composite reverse osmosis (RO) membrane with a polyamide barrier layer containing interfacial water channels was fabricated on an electrospun nanofibrous substrate via an interfacial polymerization process. The RO membrane was employed for desalination of brackish water and exhibited enhanced permeation flux as well as rejection ratio. Nanocellulose was prepared by sequential oxidations of 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) and sodium periodate systems and surface grafting with different alkyl groups including octyl, decanyl, dodecanyl, tetradecanyl, cetyl, and octadecanyl groups. The chemical structure of the modified nanocellulose was verified subsequently by Fourier transform infrared (FTIR), thermal gravimetric analysis (TGA), and solid NMR measurements. Two monomers, trimesoyl chloride (TMC) and m-phenylenediamine (MPD), were employed to prepare a cross-linked polyamide matrix, i.e., the barrier layer of the RO membrane, which integrated with the alkyl groups-grafted nanocellulose to build up interfacial water channels via interfacial polymerization. The top and cross-sectional morphologies of the composite barrier layer were observed by means of scanning electron microscopy (SEM), atomic force microscopy (AFM), and transmission electron microscopy (TEM) to verify the integration structure of the nanofibrous composite containing water channels. The aggregation and distribution of water molecules in the nanofibrous composite RO membrane verified the existence of water channels, demonstrated by molecular dynamics (MD) simulations. The desalination performance of the nanofibrous composite RO membrane was conducted and compared with that of commercially available RO membranes in the processing of brackish water, where 3 times higher permeation flux and 99.1% rejection ratio against NaCl were accomplished. This indicated that the engineering of interfacial water channels in the barrier layer could substantially increase the permeation flux of the nanofibrous composite membrane while retaining the high rejection ratio as well, i.e., to break through the trade-off between permeation flux and rejection ratio. Antifouling properties, chlorine resistance, and long-term desalination performance were also demonstrated to evaluate the potential applications of the nanofibrous composite RO membrane; remarkable durability and robustness were achieved in addition to 3 times higher permeation flux and a higher rejection ratio against commercial RO membranes in brackish water desalination.

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Confined lamellar channels structured by multilayer graphene for high-efficiency desalination

Cited by 20 publications

References 55 publications

Efficient seawater desalination in lamellar nanochannel-based boridene filtration membrane

Efficient seawater desalination in lamellar nanochannel-based boridene filtration membrane

Atomistic Simulations of the Permeability and Dynamic Transportation Characteristics of Diamond Nanochannels

High-Flux Nanofibrous Composite Reverse Osmosis Membrane Containing Interfacial Water Channels for Desalination

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