Bioinspired Graphene Oxide Membranes with pH-Responsive Nanochannels for High-Performance Nanofiltration

Zhang, Zhijie; Xiao, Xiao; Zhou, Yihao; Huang, Linjun; Wang, Yanxin; Rong, Qing-lin; Han, Zhenyang; Qu, Huaijiao; Zhu, Zhijun; Xu, Shumao; Tang, Jianguo; Chen, Jun

doi:10.1021/acsnano.1c02719

Cited by 152 publications

(70 citation statements)

References 50 publications

(77 reference statements)

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“…The above results reasonably illustrate the charge-dominated separation of charged molecules. [38] In addition, the TpEB membrane preserves high rejections to molecules with molecular weights >900 Da in ethanol, indicating the contribution of size-based exclusion to separation performances. Therefore, based on the above discussion, we conclude that the excellent nanofiltration performance of TpEB membranes is synergistically dominated by sizes and charges.…”

Section: Molecular Separation Performances Of Tpeb Membranesmentioning

confidence: 97%

Electrosynthesis of Ionic Covalent Organic Frameworks for Charge‐Selective Separation of Molecules

Wang

Yang

Shi

et al. 2022

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Up to now, an array of effective strategies, such as interfacial polymerization, [4] solvothermal growth, [5] and nanosheet assembly, [6] have been progressively developed to produce homogeneous COF-based membranes for molecular and ionic separations. Among these currently available methods, COF selective layers are either directly synthesized on porous supports or crystallized at the interface followed by transferring onto supports. Thus, the accessibility to COF membranes is substantially contingent upon the strict and rational design of the substrate properties, including pore sizes, solvent resistance, and surface functionality. [7] Moreover, due to the lack of feasible and high-efficiency methods, improving the productivity of COF membranes still faces a major challenge. Being challenged by these obstacles, it is imperative to explore innovative synthesis strategies enabling the facile and highly efficient production of COF membranes on various supports.Electrosynthesis has been widely employed as a viable approach to generating thin films on a wide range of conductive substrates. [8] It stands out among the existing film fabrication techniques mainly due to its highlighted merits including high productivity and mild operation conditions. [9] Also importantly, precise control over the film growth can be readily exerted by adjusting the electrical parameters, resulting in wellregulated film structures. [10] The implementation of growing diverse films, comprised of metal-organic frameworks (MOFs), [11] conjugated microporous polymers (CMPs), [12] hydrogen-bonded organic frameworks (HOFs), [13], etc., [14] manifestly illustrates the prominent feasibility and universality of this methodology. Electrochemical polymerization and electrophoretic deposition are the two main approaches to the preparation of separation membranes via electrosynthesis. Electrochemical polymerization relies on the electrically triggered reactions on electrodes, which start from molecular building blocks. [15] For example, Lai et al. reported the electropolymerization strategy to fabricate CMP membranes for high-precision separations. [16] Additionally, a current-driven method has been proposed for fabricating MOF membranes on inorganic and organic substrates, with significantly shortened synthesis durations of several minutes. [17] Alternatively, the electrophoretic deposition focuses on the Covalent organic frameworks (COFs) have emerged as potent material platforms for engineering advanced membranes to tackle challenging separation demands. However, the synthesis of COF membranes is currently hampered by suboptimal productivity and harsh synthesis conditions, especially for ionic COFs with perdurable charges. Herein, ionic COFs with charged nanochannels are electrically synthesized on conductive supports to rapidly construct composite membranes for charge-selective separations of small molecules. The intrinsic charging nature and strong charge intensity of ionic COFs are demonstrated to collectively dominate the membrane growth. Spo...

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Section: Molecular Separation Performances Of Tpeb Membranesmentioning

confidence: 97%

Electrosynthesis of Ionic Covalent Organic Frameworks for Charge‐Selective Separation of Molecules

Wang

Yang

Shi

et al. 2022

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“…e Schematic diagram of EG modified GO [78]. f Schematic illustration of pH-responsive nanochannels [79] allows water to pass through quickly and its permeability is negatively correlated with the thickness of the membrane, the water permeation schematic is shown in the Fig. 3c.…”

Section: Water Treatmentmentioning

confidence: 99%

“…Due to the good water permeability and high rejection of macromolecules, GO/EG membranes can be used for water purification. Zhijie Zhang et al [79] prepared a smart and high-performance GO membrane inspired by the biology of glomerular filtration function, which was constructed by introducing positively charged polyethyleneimine grafted GO (GO-PEI) into negatively charged GO nanosheets. It was found that the additional GO-PEI component changed the surface charge, improved hydrophilicity, and enlarged the nanochannels.…”

Section: Water Treatmentmentioning

confidence: 99%

A review of graphene-oxide/metal–organic framework composites materials: characteristics, preparation and applications

Huang

Han

et al. 2021

J Porous Mater

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Graphene-oxide (GO) is an oxidized derivative of graphene. GO has a large number of oxygen-containing functional groups, including hydroxyl, carboxyl, and epoxy groups. The introduction of these groups makes its physical and chemical properties more complicated. For example, although GO films are impermeable to other liquids and even gases, they exhibit abnormally high permeance of water through the GO film. As a three-dimensional hollow material, metal-organic frameworks (MOFs) have a very large specific surface area and pore volume, and have a wide range of applications in catalysis, adsorption, and separations. Combining GO with MOFs can alter the distance between the layers of the GO to affect the transport and screening of specific molecules. This gives composites many potential applications in areas such as gas treatment and water treatment. This review summarizes the current status of GO/MOF composites, expanding on the following aspects: (1) We begin by reviewing the current status of research on GO and MOF with a focus on the physical properties. The mechanical strength of single-layer graphene is very weak, and in most solvents, GO spontaneously aggregates and is very difficult to effectively disperse. On the other hand, MOFs have high specific surface area, high crystallinity, and high porosity, but relatively low stability. Their relative instability greatly limited their practical applications. The formation of GO/MOF composites can take advantage of desirable properties of both material types, while improving their physical characteristics.(2) We next review the characteristics, preparation and applications of GO/MOF composites. At present, various GO/MOF composite materials, such as GO/ZIF-8, GO/MOF-5 have been prepared by in-situ synthesis and other methods. They are widely used in gas adsorption and separation, wastewater treatment applications, and molecular sieve applications. (3) We conclude this review by summarizing the opportunities for achieving composites materials with hydrophilic, antifouling, high-throughput, and high-repulsion properties by efficient, controllable, and low-cost methods. As GO/MOF technology improves, we suggest that these versatile materials have additional prospective applications in other areas, including as materials for medical applications.

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“…Tunable mass transport is of fundamental importance not only in separation-based applications − but also in biological sensing, drug delivery, , catalysis, , nanofluidics, , proton transport, and energy harvesting . Responsive nanochannels with tunable sieving diameters are the best candidates for such applications. − To date, stimuli, such as heat, environmental pH, , ions/molecules, , and light, have been used to produce controllable responses of nanochannels, but challenges remain, particularly in terms of stimulus complexity (e.g., solutions and ions) and response uncontrollability (e.g., low durability and response rate) …”

Section: Introductionmentioning

confidence: 99%

“…34 Responsive nanochannels with tunable sieving diameters are the best candidates for such applications. 35−37 To date, stimuli, such as heat, 38 environmental pH, 39,40 ions/molecules, 41,42 have been used to produce controllable responses of nanochannels, but challenges remain, particularly in terms of stimulus complexity (e.g., solutions and ions) and response uncontrollability (e.g., low durability and response rate). 36 Herein, we computationally investigate the actuation performance of Sc 2 C MNTs in response to charge injection.…”

Section: ■ Introductionmentioning

confidence: 99%

Electromechanically Actuated MXene Nanotubes for Tunable Mass Transport

Yao

Zhou

et al. 2021

J. Phys. Chem. C

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Developing stimuli-responsive nanochannels for tunable mass transport has attracted considerable attention. Herein, we investigate the electromechanical actuation of Sc 2 C MXene nanotubes (MNTs) that can be rolled from planar Sc 2 C and the application of the electromechanically actuated MNTs for tunable mass transport. Our results demonstrate that the maximum radial actuation strain is as high as 26.8% for MNTs upon charge injection while maintaining sufficient structural integrity. The underlying mechanism behind this high actuation performance of MNTs and planar Sc 2 C is revealed by atomic-and electronic-scale analyses. Finally, we probe the transport behaviors of a molecule test case (neopentane, C 5 H 12 ) passing through electromechanically actuated MNTs and demonstrate that the tunability of sieving diameters endows MNTs with the capability of tunable mass transport. These findings provide a feasible solution for the development of tunable nanochannels.

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Bioinspired Graphene Oxide Membranes with pH-Responsive Nanochannels for High-Performance Nanofiltration

Cited by 152 publications

References 50 publications

Electrosynthesis of Ionic Covalent Organic Frameworks for Charge‐Selective Separation of Molecules

Electrosynthesis of Ionic Covalent Organic Frameworks for Charge‐Selective Separation of Molecules

A review of graphene-oxide/metal–organic framework composites materials: characteristics, preparation and applications

Electromechanically Actuated MXene Nanotubes for Tunable Mass Transport

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