Improving the hydrogen selectivity of graphene oxide membranes by reducing non-selective pores with intergrown ZIF-8 crystals

Wang, Xuerui; Chi, Chenglong; Tao, Jifang; Peng, Yongwu; Ying, Shao‐Ming; Qian, Yuhong; Dong, Jinqiao; Hu, Zhigang; Gu, Yuandong; Zhao, Dan

doi:10.1039/c6cc02013e

Cited by 74 publications

(50 citation statements)

References 49 publications

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“…In general, molecular transport within 2D‐material membranes is first through the in‐plane slit‐like pores, and then into the out‐of‐plane interlayer spacing. [1a,2a,9g] Particularly, Zhao et al demonstrated that the in‐plane slit‐like pores can play a key role in determining the molecular sieving performance of GO membranes. In our work, the interlayer spacing of pristine MXene is 1.5 nm as indicated by XRD (Figure e).…”

Section: Selective H2 Transport Through Pristine Mxene Channelsmentioning

confidence: 99%

2D MXene Nanofilms with Tunable Gas Transport Channels

Shen

Liu

et al. 2018

Adv Funct Materials

381

245

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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: Selective H2 Transport Through Pristine Mxene Channelsmentioning

confidence: 99%

2D MXene Nanofilms with Tunable Gas Transport Channels

Shen

Liu

et al. 2018

Adv Funct Materials

381

245

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“…Previous studies on ultrathin two-dimensional (2D) membranes are primarily focused on 2D inorganic nanosheets as building blocks, such as exfoliated zeolites 1 2 3 , graphene 3 4 5 , or graphene oxide (GO) (refs 5 , 6 , 7 , 8 , 9 ). These building blocks with strong mechanical strength can be easily obtained for membrane fabrication.…”

mentioning

confidence: 99%

Reversed thermo-switchable molecular sieving membranes composed of two-dimensional metal-organic nanosheets for gas separation

et al. 2017

Self Cite

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It is highly desirable to reduce the membrane thickness in order to maximize the throughput and break the trade-off limitation for membrane-based gas separation. Two-dimensional membranes composed of atomic-thick graphene or graphene oxide nanosheets have gas transport pathways that are at least three orders of magnitude higher than the membrane thickness, leading to reduced gas permeation flux and impaired separation throughput. Here we present nm-thick molecular sieving membranes composed of porous two-dimensional metal-organic nanosheets. These membranes possess pore openings parallel to gas concentration gradient allowing high gas permeation flux and high selectivity, which are proven by both experiment and molecular dynamics simulation. Furthermore, the gas transport pathways of these membranes exhibit a reversed thermo-switchable feature, which is attributed to the molecular flexibility of the building metal-organic nanosheets.

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“…Recently, graphene oxide(GO)-based composite membranes including GO/MOFs, GO/ZIFs, GO/COFs and GO/zeolite have attracted great attention due to the fact that the porous material (filler) can repair the in-plane defects and adjust the interlayer spacing between GO layers. Using GO can bring additional porosity and thus improve the efficient sieving of light gases or small ions [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…Homogeneous and gap-free dispersion of porous materials including zeolites in graphene oxide remains the major challenge because of differences properties, which causes the low separation efficiency of the membranes due to the following reasons: (1) the weak interactions between GO matrix and the porous materials inevitably results in void formation, which further affects their separation efficiency, (2) the low content of porous materials weaken their performance in gas separation if the defects are still present. The GO-based sandwich-type composite membrane can be prepared by stacking layers with complementary properties in order to improve the gas separation performance.…”

Section: Introductionmentioning

confidence: 99%

Sandwich-type H2/CO2 membranes comprising of graphene oxide and sodalite crystals with adjustable morphology and size

Yang

Guo

Kang

et al. 2020

Microporous and Mesoporous Materials

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Sandwich-type membranes comprising of graphene oxide (GO) as a "bun" and sodalite (SOD) nanocrystals with different morphology and size as an inner layer were prepared. First, the SOD nanocrystals with spheroidal (size of 30 nm) and flake-like (size of 150 nm) morphology were synthesized from precursor suspensions containing the same amount of GO as a modifier but different amount of water. Second, the SOD nanocrystals with different morphology and size were deposited between two GO layers to form the sandwich-type membrane. The performance of the sandwich-type membranes in H2/CO2 gas separation was optimized by tuning the properties of the SOD inner layer. The membrane containing spheroidal SOD nanocrystals showed higher H2 permeance of 4003±1965 GPU and H2/CO2 selectivity of 45.5±1.7 at 25 ºC in comparison to the pristine GO membrane (1642±145 GPU and H2/CO2 selectivity of 11.2±2.1).

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Improving the hydrogen selectivity of graphene oxide membranes by reducing non-selective pores with intergrown ZIF-8 crystals

Abstract: We report the intergrowth of ZIF-8 crystals on ultrathin graphene oxide (GO) membranes, which helps to reduce the non-selective pores of pristine GO membranes leading to gas selectivities as high as 406, 155, and 335 for H2/CO2, H2/N2, and H2/CH4 mixtures, respectively.

Cited by 74 publications

References 49 publications

2D MXene Nanofilms with Tunable Gas Transport Channels

2D MXene Nanofilms with Tunable Gas Transport Channels

Reversed thermo-switchable molecular sieving membranes composed of two-dimensional metal-organic nanosheets for gas separation

Sandwich-type H2/CO2 membranes comprising of graphene oxide and sodalite crystals with adjustable morphology and size

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