Multilayered graphene oxide membranes for water treatment: A review

Yi, Wei; Zhang, Yushan; Gao, Xueli; Ma, Zhen; Wang, Xiaojuan; Gao, Congjie

doi:10.1016/j.carbon.2018.07.040

Cited by 249 publications

(94 citation statements)

References 171 publications

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“…By virtue of these merits, laminar membranes have been made of various 2D materials, and widely utilized as selective units in water treatment, ion recovery and removal, energy storage and conversion devices, as outlined in recent reviews ( Figure , left) . Behind these applications lie a fundamental question: how water and ion transport are controlled in the laminar structure to obtain desired selectivity.…”

Section: Introductionmentioning

confidence: 99%

2D Laminar Membranes for Selective Water and Ion Transport

Kang

Xia

Wang

et al. 2019

Adv Funct Materials

256

148

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energy storage and conversion devices, [26][27][28] as outlined in recent reviews (Figure 1, left). [29] Behind these applications lie a fundamental question: how water and ion transport are controlled in the laminar structure to obtain desired selectivity. A comprehensive summary of structure-transport relation is thereby imperative to understand and optimize membrane selective performance, but is so far lacking. In such context, our review aims to fill this gap by discussing: 1) how 2D materials with specific physicochemical features are assembled into laminar membranes; 2) most importantly, how membrane structure, and its response to external impacts, can tune mass transport (herein, water and ions); 3) how these transport mechanisms translate into selectivity in applications, and into future design of high-performance laminar membranes. Unsolved problems and emerging challenges around these topics are then concluded. We note that the knowledge summarized here can also, at least partly, assist the understanding of the selective gas, liquid, and micromolecule transport through laminar membranes, which are gaining considerable attention as well. [30][31][32] Transition Metal Carbides and/or Nitrides (MXene): MXene nanosheets are etched and delaminated from parent bulk MAX to M n+1 X n T x (e.g., Ti 3 C 2 T x ), and have thus several atom sublayers. [39] While M and X are early transition metal

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Section: Introductionmentioning

confidence: 99%

2D Laminar Membranes for Selective Water and Ion Transport

Kang

Xia

Wang

et al. 2019

Adv Funct Materials

256

148

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“…In recent years, nanoconfined water flow behavior has become a heat and attractive research topic, which is the key underlying physical mechanism in a great deal of industries, encompassing water purification, energy storage material fabrication, hydraulic fracturing within petroleum engineering, and so on. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] However, although current experimental technology and theoretical research have been significantly advanced, nanoconfined water transport capacity is still unclear, which is controlled by multiple effects simultaneously. 15,16 Owing to its complexity in theoretical view and wide application scope, investigations regarding water flow within nanopores share vast theoretical interests and potential commercial values.…”

Section: Introductionmentioning

confidence: 99%

Effect of pore geometry on nanoconfined water transport behavior

Sun

Shi

et al. 2019

AIChE Journal

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Different pore shapes correspond to different interaction strengths between pore surface and molecules, which will result in discrepancy of nanoconfined water transport capacity. In this article, complex nanoscale pore shapes are represented by ellipses, which possess an excellent shape-variation physical property, that is, ellipses can gradually transition from circles to slit-like cross-sections by manipulating aspect ratio from 1 to maxima. Moreover, capturing water slip phenomenon and spatially variation of water viscosity, an analytical model for water transport capacity through elliptical nanopores is developed. Results show that (a) water slip effect plays a limited positive role at hydrophilic environment and a strong positive role at hydrophobic environment;(b) nanopores with more flat geometry feature will possess smaller enhance factor at hydrophilic environment; (c) spatially viscosity distribution is a negative factor when contact angle is lower than about 130 and turns to a positive factor when contact angle is higher than about 130 . K E Y W O R D Snanoconfined water flow, various pore shapes, water slip phenomenon, water viscosity

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“…Moreover, they are economical and massive to prepare, showing great potential for low cost commercial applications. 76 Benefited from the functional groups, GO/RGO sheets exhibit excellent field emission properties. Typically, the GO-based FETs are p-type under ambient conditions due to the p-type doping induced by oxygen-containing groups, but the highly reduced GO will present graphene-like ambipolar behavior.…”

Section: Field-effect Transistors (Fets)mentioning

confidence: 99%

Physical properties and device applications of graphene oxide

2020

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Graphene oxide (GO), the functionalized graphene with oxygenated groups (mainly epoxy and hydroxyl), has attracted resurgent interests in the past decade owing to its large surface area, superior physical and chemical properties, and easy composition with other materials via surface functional groups. Usually, GO is used as an important raw material for mass production of graphene via reduction. However, under different conditions, the coverage, types, and arrangements of oxygencontaining groups in GO can be varied, which give rise to excellent and controllable physical properties, such as tunable electronic and mechanical properties depending closely on oxidation degree, suppressed thermal conductivity, optical transparency and fluorescence, and nonlinear optical properties. Based on these outstanding properties, many electronic, optical, optoelectronic, and thermoelectric devices with high performance can be achieved on the basis of GO. Here we present a comprehensive review on recent progress of GO, focusing on the atomic structures, fundamental physical properties, and related device applications, including transparent and flexible conductors, field-effect transistors, electrical and optical sensors, fluorescence quenchers, optical limiters and absorbers, surface enhanced Raman scattering detectors, solar cells, light-emitting diodes, and thermal rectifiers.

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Multilayered graphene oxide membranes for water treatment: A review

Cited by 249 publications

References 171 publications

2D Laminar Membranes for Selective Water and Ion Transport

2D Laminar Membranes for Selective Water and Ion Transport

Effect of pore geometry on nanoconfined water transport behavior

Physical properties and device applications of graphene oxide

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