Nanoparticles@rGO membrane enabling highly enhanced water permeability and structural stability with preserved selectivity

Zhang, Mengchen; Guan, Kecheng; Shen, Jie; Liu, Gongping; Fan, Yiqun; Jin, Wanqin

doi:10.1002/aic.15939

Cited by 119 publications

(52 citation statements)

References 59 publications

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“…As a top‐down method, wet etching was used to synthesize Ti 3 C 2 T x MXene in this work (see the “Experimental Section” and Figure S1 in the Supporting Information) . It is well known that the nanosheets with lower concentration of defects is crucial for obtaining high‐quality 2D membranes . Generally, milder etching conditions can synthesize MXene sheets with less defects .…”

Section: Synthesis Of Mxene Nanosheetsmentioning

confidence: 99%

2D MXene Nanofilms with Tunable Gas Transport Channels

Shen

Liu

et al. 2018

Adv Funct Materials

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2D materials' membranes with well-defined nanochannels are promising for precise molecular separation. Herein, the design and engineering of atomically thin 2D MXene flacks into nanofilms with a thickness of 20 nm for gas separation are reported. Well-stacked pristine MXene nanofilms are proven to show outstanding molecular sieving property for H 2 preferential transport. Chemical tuning of the MXene nanochannels is also rationally designed for selective permeating CO 2 . Borate and polyethylenimine (PEI) molecules are well interlocked into MXene layers, realizing the delicate regulation of stacking behaviors and interlayer spacing of MXene nanosheets. The MXene nanofilms with either H 2 -or CO 2 -selective transport channels exhibit excellent gas separation performance beyond the limits for state-of-the-art membranes. The mechanisms within these nanoconfined MXene layers are discussed, revealing the transformation from "diffusion-controlled" to "solution-controlled" channels after chemical tuning. This work of precisely tailoring the 2D nanostructure may inspire the exploring of nanofluidics in 2D confined space with applications in many other fields like catalysis and energy conversion processes.fabrication. Hence, MXene is considered to be a novel potential candidate for developing separative 2D-material membranes. However, there are a very few reports on MXene separation membranes. Gogotsi and co-workers first reported MXene membranes for rejection of trivalent cation in solution using nonpressure diffusion. [12] A high water permeance was obtained by applying MXene stacks in the pressure-filtration process, [13] but the membrane can only rejected matters with a size larger than 2.5 nm. Very recently, Wang and co-workers [14] reported the manufacturing of MXene membranes with highly ordered nanochannel structures for high-performance separation of H 2 /CO 2 , which opens the door of applying MXene membranes for molecular separation. It is considered that rationally regulating the nanostructure of 2D channels may, thereby, enlighten the exploring of MXene materials for sub-nanoscale separation with versatile functionalities.Herein, we report the design and engineering of MXene nanofilms with tunable transport channels for gas separation. Ultrathin pristine MXene nanofilms with a thickness down to 20 nm were fabricated by horizontally aligning the exfoliated MXene nanosheets on porous substrates. Molecular sieving channels within pristine MXene nanofilm can be formed to show highly selective H 2 permeation, as shown in Figure 1. Interestingly, these MXene laminates, as functionalized by borate and amine, exhibit different stacking behaviors and tunable interlayer spacing, allowing preferential CO 2 permeation. The resulting separation performance of either H 2 -or CO 2selective MXene nanofilms is beyond the performance limits for state-of-the-art membranes.

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Section: Synthesis Of Mxene Nanosheetsmentioning

confidence: 99%

2D MXene Nanofilms with Tunable Gas Transport Channels

Shen

Liu

et al. 2018

Adv Funct Materials

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381

245

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“…One strategy is to crosslink nanosheets with diminutive 0D and 1D materials, molecules and even ions ( Figure a). This process involves the insertion or in‐situ growth of crosslinkers among host nanosheets, so that one or several attractive forces can be introduced in between to stabilize laminar structure . For instance, the versatile surface of GO sheets enables their crosslinking by various routes, including 1) chemical bonding, which is formed between the groups on GO surface (carboxyl, epoxy, hydroxyl) and crosslinkers (amino and carboxyl) via multiple reactions (esterification, dehydration condensation, and nucleophilic addition reaction); 2) electrostatic attraction, which links negatively charged GO sheets and positively charged materials; 3) intermolecular force, which firmly connects GO nanosheets and other carbon materials by conjugated π‐electron cloud .…”

Section: Transport‐controlling Effectsmentioning

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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“…Finally, the GO suspension was filtrated by a nylon filter with pore size of 75 μm to remove possible agglomerations. Determined amount of as-prepared GO suspension was diluted to 200 mL by water and was followed by filtration through the cation-loaded hPAN substrate (effective area of 15 cm 2 ) via pressurized filtration process [55,56] under 2 bar to deposit GO nanosheets on the substrate. This process takes around 10 h to ensure that the water solvent was squeezed out of the membrane as much as possible.…”

Section: Fabrication Of Thin Go Membranesmentioning

confidence: 99%

Cation-diffusion controlled formation of thin graphene oxide composite membranes for efficient ethanol dehydration

et al. 2019

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Structural manipulation of graphene oxide (GO) building blocks has been widely researched. Concerning GO membranes for separation applications, the validity and maintenance of their microscopic structures in the chemical environment are pivotal for effective separation at the molecular scale. Cationic interactions with both aromatic rings and oxygenated functional groups of GO make metal ions intriguing for physically and chemically structural reinforcement. By filtrating GO suspension through the substrate loaded with cations, stacking of GO nanosheets and diffusion of cations steadily evolve simultaneously in an aqueous environment without flocculation. Thus, thin and homogeneous GO membrane is obtained. Divalent and monovalent cations were studied regarding their interactions with GO, and the performance of correspondingly functionalized membranes was evaluated. The divalent cation-stabilized membranes have favorable stability in the separation of water/ethanol. This facile fabrication and functionalization method may also be applicable for structure construction of other two-dimensional materials.

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Nanoparticles@rGO membrane enabling highly enhanced water permeability and structural stability with preserved selectivity

Cited by 119 publications

References 59 publications

2D MXene Nanofilms with Tunable Gas Transport Channels

2D MXene Nanofilms with Tunable Gas Transport Channels

2D Laminar Membranes for Selective Water and Ion Transport

Cation-diffusion controlled formation of thin graphene oxide composite membranes for efficient ethanol dehydration

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