Robust construction of a graphene oxide barrier layer on a nanofibrous substrate assisted by the flexible poly(vinylalcohol) for efficient pervaporation desalination

Cheng, Cheng; Shen, Lingdi; Yu, Xufeng; Yang, Yin; Li, Xiong; Wang, Xuefen

doi:10.1039/c6ta09443k

Cited by 97 publications

(37 citation statements)

References 45 publications

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“…5b. The WCA of the control GO membrane is 54.5°, in good agreement with previous reports, 14,26 whereas that of the GOF-SSA is 26.6°. When encountering water molecules, the sulfonic groups chemically grafted onto the GO surface would be protonated, which becomes more hydrophilic than the three membered epoxide rings of GO or -OH groups, thus exhibiting greater hydrophilicity compared with the control GO membrane.…”

supporting

confidence: 92%

“…That results in a decrease in the hydrophilicity of the GOF membrane. 26 For PV dehydration of alcohol or desalination, enhancing the hydrophilicity while controlling the swelling of the GOF membranes is favorable to obtain high separation performance. In order to realize that, a molecule with moderate size and additional functional groups in conjunction with the reactive groups may be a suitable candidate as a crosslinker.…”

mentioning

confidence: 99%

“…S17e †). A performance comparison between GOF-SSA and other membranes reported recently 26,[42][43][44][45] has been conducted (Fig. 6b).…”

mentioning

confidence: 99%

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Functionalizing graphene oxide framework membranes with sulfonic acid groups for superior aqueous mixture separation

et al. 2019

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confidence: 92%

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confidence: 99%

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Functionalizing graphene oxide framework membranes with sulfonic acid groups for superior aqueous mixture separation

et al. 2019

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“…Liang et al [159] explored the potential of pervaporation with GO/PAN composite membranes for desalination. Pervaporation desalination was also investigated by Cheng et al [160], using membranes of GO on an electrospun nanofibrous PAN support. Ying et al [161] intercalated superhydrophilic metal-organic frameworks into the GO layered structure and reported enhancements in separation factor and flux for pervaporation of an ethyl acetate/water mixture.…”

Section: Applications Of Graphene and Graphene Oxidementioning

confidence: 99%

The potential of polymers of intrinsic microporosity (PIMs) and PIM/graphene composites for pervaporation membranes

et al. 2019

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Pervaporation (PV), a membrane process in which the feed is a liquid mixture and the permeate is removed as a vapour, offers an energy-efficient alternative to conventional separation processes such as distillation, and can be applied to mixtures that are difficult to separate, such as azeotropes. Here the principles of pervaporation and its industrial applications are outlined. Two classes of material that show promise for use in PV membranes are described: Polymers of intrinsic microporosity (PIMs) and 2D materials such as graphene. The literature regarding PV utilizing the prototypical PIM (PIM-1) and it hydrophilic hydrolysed form (cPIM-1) is reviewed. Self-standing PIM-1 membranes give competitive results compared to other membranes reported in the literature for the separation of alcohols and other volatile organic compounds from aqueous solution, and for organic/organic separations such as methanol/ethylene glycol and dimethyl carbonate/methanol mixtures. Blends of cPIM-1 with conventional polymers improve the flux for dehydration of alcohols. The incorporation of fillers, such as functionalised graphene-like fillers, into PIM-1 to form mixed matrix membranes can enhance the separation performance. Thin film composite (TFC) membranes enable very high fluxes to be achieved when a suitable support with high surface porosity is utilised. When functionalised graphene-like fillers are introduced into the selective layer of a TFC membrane, the lateral size of the flakes needs to be carefully controlled. There is a wide range of PIMs and 2D materials yet to be explored for PV applications, which offer potential to create bespoke membranes for a wide variety of organic/aqueous and organic/organic separations.

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“…Among all the PVA films studied here, P(AA-AMPS) crosslinked PVA showed the highest mechanical strength. The deposition of this composite as a selective layer on nanofibrous PAN supports via spray coating yielded TFC membranes with desalination performances that outperformed current PV desalination 6,16 (by a factor of 3-20-fold), state-of-the-art vacuum 3 , and direct contact MD membranes 17 .…”

mentioning

confidence: 99%

Tailoring the molecular structure of crosslinked polymers for pervaporation desalination

et al. 2020

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Polymer crosslinking imbues chemical stability to thin films at the expense of lower molecular transportation rates. Here in this work we deployed molecular dynamics simulations to optimise the selection of crosslinking compounds that overcome this trade-off relationship. We validated these simulations using a series of experiments and exploited this finding to underpin the development of a pervaporation (PV) desalination thin-film composite membrane with water fluxes reaching 234.9 ± 8.1 kg m −2 h −1 and salt rejection of 99.7 ± 0.2 %, outperforming existing membranes for pervaporation and membrane distillation. Key to achieving this state-of-the-art desalination performance is the spray coating of 0.73 μm thick crosslinked dense, hydrophilic polymers on to electrospun nanofiber mats. The desalination performances of our polymer nanocomposites are harnessed here in this work to produce freshwater from brackish water, seawater and brine solutions, addressing the key environmental issue of freshwater scarcity.

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Robust construction of a graphene oxide barrier layer on a nanofibrous substrate assisted by the flexible poly(vinylalcohol) for efficient pervaporation desalination

Abstract: A novel thin-film nanofibrous composite (TFNC) membrane with a robust graphene oxide barrier layer assisted by PVA for efficient pervaporation desalination.

Cited by 97 publications

References 45 publications

Functionalizing graphene oxide framework membranes with sulfonic acid groups for superior aqueous mixture separation

Functionalizing graphene oxide framework membranes with sulfonic acid groups for superior aqueous mixture separation

The potential of polymers of intrinsic microporosity (PIMs) and PIM/graphene composites for pervaporation membranes

Tailoring the molecular structure of crosslinked polymers for pervaporation desalination

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