Graphene Oxide Membranes with Heterogeneous Nanodomains for Efficient CO<sub>2</sub> Separations

Wang, Shaofei; Xie, Yonghui; He, Guangwei; Xin, Qingping; Zhang, Jinhui; Yang, Long; Li, Yifan; Wu, Hong; Zhang, Yuzhong; Guiver, Michael D.; Jiang, Zhongyi

doi:10.1002/anie.201708048

Cited by 131 publications

(62 citation statements)

References 44 publications

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“…Molecular transport in gas separation membranes is determined by two crucial properties: diffusivity and solubility. [9h,24a,25b] To achieve efficient gas separation, it is highly desirable to construct the nanochannels with appropriate size to increase the diffusivity selectivity as well as favorable affinity toward target molecules to enhance the solubility selectivity . As shown in Figure a, the interlayer spacing of MXene is reduced after borate crosslinking, from 1.50 to 1.29 nm, as the crosslinking temperature increases from 55 to 75 °C.…”

Section: Tuning the Mxene Channels For Selective Co2 Transportmentioning

confidence: 99%

“…It can be attributed to the reduced interlayer spacing and the crosslinking structure of the functionalized MXene nanofilm, like similar behaviors found in GO membranes. [7a,18,44a] The CO 2 /CH 4 system was chosen for studying the separation behaviors. By optimizing the fabricating conditions such as crosslinking temperature, borate/PEI concentration, membrane thickness ( Figure c; Figures S28, S30, and S32 and Table S8, Supporting Information), the functionalized MXene nanofilm shows a desirable CO 2 capture performance; CO 2 permeance of 350 GPU with a CO 2 /CH 4 selectivity of 15.3.…”

Section: Tuning the Mxene Channels For Selective Co2 Transportmentioning

confidence: 99%

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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: Tuning the Mxene Channels For Selective Co2 Transportmentioning

confidence: 99%

Section: Tuning the Mxene Channels For Selective Co2 Transportmentioning

confidence: 99%

2D MXene Nanofilms with Tunable Gas Transport Channels

Shen

Liu

et al. 2018

Adv Funct Materials

381

245

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“…Besides, the highly straight and regular nanotubes permit continuous and oriented arrangement of molecules, while the existing 2D nanochannels are usually tortuous which would disturb the ordered alignment during the mass transfer process . Furthermore, typical 2D nanochannels often possess low density or unevenly distributed functional groups, making it difficult to implement uniform post‐modification and manipulate molecular alignment.…”

Section: Figurementioning

confidence: 99%

Elucidating Ultrafast Molecular Permeation through Well‐Defined 2D Nanochannels of Lamellar Membranes

Cui

et al. 2019

Angew Chem Int Ed

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108

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Lamellar membranes with well‐defined 2D nanochannels show fast, selective permeation, but the underlying molecular transport mechanism is unexplored. Now, regular robust MXene Ti3C2Tx lamellar membranes are prepared, and the size and wettability of nanochannels are manipulated by chemically grafted hydrophilic (−NH2) or hydrophobic (−C6H5, −C12H25) groups. These nanochannels have a sharp difference in mass transfer behavior. Hydrophilic nanochannels, in which polar molecules form orderly aligned aggregates along channel walls, impart ultrahigh permeance (>3000 L m−2 h−1 bar−1), which is more than three times higher than that in hydrophobic nanochannels with disordered molecular configuration. In contrast, nonpolar molecules with disordered configuration in both hydrophilic and hydrophobic nanochannels have comparable permeance. Two phenomenological transport models correlate the permeance with the mass transport mechanism of molecules that display ordered and disordered configuration.

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“…Graphene‐based nanosheets have been considered as a kind of ideal nanomaterials for MMMs. Jiang's group presented a method to construct GO gas transport channels by introducing CO 2 ‐philic crosslinking agent ( Figure ) . This method allowed to construct non‐uniform CO 2 ‐affinity/ non‐CO 2 ‐affinity nano‐regions in membranes.…”

Section: Gas Transport Channels Constructed With Different Dimensionamentioning

confidence: 99%

Section: Gas Transport Channels Constructed With Different Dimensionamentioning

confidence: 99%

Recent Advances of Gas Transport Channels Constructed with Different Dimensional Nanomaterials in Mixed‐Matrix Membranes for CO₂ Separation

Wang

Sheng

et al. 2020

Small Methods

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Most CO2 separation membranes are polymeric membranes owing to low cost and easy processability. Nevertheless, conventional polymeric membranes may suffer from a compromise between permeability and selectivity represented by the Robeson upper bound curves. Mixed‐matrix membranes (MMMs), prepared by adding nanomaterials in polymer matrices, can achieve both high gas permeability and selectivity with the potential for future applications. This review summarizes gas transport channels constructed with different dimensional nanomaterials in MMMs such as 1D, 2D, and 3D nanomaterials which have been widely researched in recent years, and discusses the effect of different gas transport channels in CO2 separation MMMs. The challenges about each kind of gas transport channels are outlined and future prospects are suggested.

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Graphene Oxide Membranes with Heterogeneous Nanodomains for Efficient CO₂ Separations

Cited by 131 publications

References 44 publications

2D MXene Nanofilms with Tunable Gas Transport Channels

2D MXene Nanofilms with Tunable Gas Transport Channels

Elucidating Ultrafast Molecular Permeation through Well‐Defined 2D Nanochannels of Lamellar Membranes

Recent Advances of Gas Transport Channels Constructed with Different Dimensional Nanomaterials in Mixed‐Matrix Membranes for CO₂ Separation

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Graphene Oxide Membranes with Heterogeneous Nanodomains for Efficient CO2 Separations

Cited by 131 publications

References 44 publications

2D MXene Nanofilms with Tunable Gas Transport Channels

2D MXene Nanofilms with Tunable Gas Transport Channels

Elucidating Ultrafast Molecular Permeation through Well‐Defined 2D Nanochannels of Lamellar Membranes

Recent Advances of Gas Transport Channels Constructed with Different Dimensional Nanomaterials in Mixed‐Matrix Membranes for CO2 Separation

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Resources

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Graphene Oxide Membranes with Heterogeneous Nanodomains for Efficient CO₂ Separations

Recent Advances of Gas Transport Channels Constructed with Different Dimensional Nanomaterials in Mixed‐Matrix Membranes for CO₂ Separation