Nafion/IL hybrid membranes with tuned nanostructure for enhanced CO<sub>2</sub> separation: effects of ionic liquid and water vapor

Dai, Zhongde; Ansaloni, Luca; Ryan, J. J.; Spontak, Richard J.; Deng, Liyuan

doi:10.1039/c7gc03727a

Cited by 66 publications

(55 citation statements)

References 70 publications

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“…After submersion, however, CO 2 permeability through all the membranes becomes substantially more sensitive to RH level, increasing dramatically to 291, 436, and 482 Barrer in TIPA-, THF-, and CF-cast membranes, respectively, due presumably to the formation of irregular nanoscale channels 34 that promote CO 2 diffusion. In the case of the CF-cast membranes, this increase corresponds to a permeability enhancement of ≈650% and exceeds the highest CO 2 permeability reported 35 for a polyelectrolyte (390 Barrer in Nafion ® modified with an ionic liquid at 100% RH). Even the postsubmersion membrane cast from CH exhibits a CO 2 permeability of ≈100 Barrer, thereby confirming that the submersion-induced morphological transformation that disorders most of the as-cast sample morphologies (cf.…”

Section: Resultsmentioning

confidence: 57%

Highly CO2-permeable membranes derived from a midblock-sulfonated multiblock polymer after submersion in water

et al. 2019

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To mitigate the effect of atmospheric CO 2 on global climate change, gas separation materials that simultaneously exhibit high CO 2 permeability and selectivity in gas mixtures must be developed. In this study, CO 2 transport through midblock-sulfonated block polymer membranes prepared from four different solvents is investigated. The results presented here establish that membrane morphology and accompanying gas transport properties are sensitive to casting solvent and relative humidity. We likewise report an intriguing observation: submersion of these thermoplastic elastomeric membranes in liquid water, followed by drying prior to analysis, promotes not only a substantial change in membrane morphology, but also a significant improvement in both CO 2 permeability and CO 2 /N 2 selectivity. Measured CO 2 permeability and CO 2 /N 2 selectivity values of 482 Barrer and 57, respectively, surpass the Robeson upper bound, indicating that these nanostructured membranes constitute promising candidates for gas separation technologies aimed at CO 2 capture.

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Section: Resultsmentioning

confidence: 57%

Highly CO2-permeable membranes derived from a midblock-sulfonated multiblock polymer after submersion in water

et al. 2019

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“…(Figure 3d) and CH 4 ( Figure S9a, Supporting Information), whether the permeance of gases is in the form of GPU or Barrer. [24,27,28,[48][49][50][51][52][53][54][55][56][57][58] For commercially polymeric membranes, there is a trade-off between separation factor and permeability. This trade-off relationship is related to the "2008 Robeson upper bound".…”

Section: Resultsmentioning

confidence: 99%

Photothermal‐Responsive Microporous Nanosheets Confined Ionic Liquid for Efficient CO₂ Separation

Deng

Wan

Chen

et al. 2020

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2D materials hold promising potential for novel gas separation. However, a lack of in‐plane pores and the randomly stacked interplane channels of these membranes still hinder their separation performance. In this work, ferrocene based‐MOFs (Zr‐Fc MOF) nanosheets, which contain abundant of in‐plane micropores, are synthesized as porous supports to fabricate Zr‐Fc MOF supported ionic liquid membrane (Zr‐Fc‐SILM) for highly efficient CO2 separation. The micropores of Zr‐Fc MOF nanosheets not only provide extra paths for CO2 transportation, and thus increase its permeance up to 145.15 GPU, but also endow the Zr‐Fc‐SILM with high selectivity (216.9) of CO2/N2 through the nanoconfinement effect, which is almost ten times higher than common porous polymer SILM. Furthermore, based on the photothermal‐responsive properties of Zr‐Fc MOF, the performance is further enhanced (35%) by light irradiation through a photothermal heating process. This provides a brand new way to design light facilitating gas separation membranes.

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“…Gas-separation performance was measured in a humid mixed-gas permeation setup with adjustable RH, as schematically depicted in Figure 3 . More details about the testing procedure can be found in our previous reports [ 35 , 36 ]. The RH value is controlled by using four mass flow controllers (El-Flow series, Bronkhorst, Veenendaal, Netherland).…”

Section: Methodsmentioning

confidence: 99%

Poly(1-trimethylsilyl-1-propyne)-Based Hybrid Membranes: Effects of Various Nanofillers and Feed Gas Humidity on CO2 Permeation

et al. 2018

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Poly(1-trimethylsilyl-1-propyne) (PTMSP) is a high free volume polymer with exceptionally high gas permeation rate but the serious aging problem and low selectivity have limited its application as CO2 separation membrane material. Incorporating inorganic nanoparticles in polymeric membranes has been a common approach to improve the separation performance of membranes, which has also been used in PTMSP based membrane but mostly with respect to tackling the aging issues. Aiming at increasing the CO2 selectivity, in this work, hybrid membranes containing four types of selected nanofillers (from 0 to 3D) were fabricated using PTMSP as the polymer matrix. The effects of the various types of nanofillers on the CO2 separation performance of the resultant membranes were systematically investigated in humid conditions. The thermal, chemical and morphologic properties of the hybrid membranes were characterized using TGA, FTIR and SEM. The gas permeation properties of the hybrid membranes were evaluated using mixed gas permeation test with the presence of water vapour to simulate the flue gas conditions. Experiments show that the addition of different fillers results in significantly different separation performances; The addition of ZIF-L porous 2D filler improves the CO2/N2 selectivity at the expenses of CO2 permeability, while the addition of TiO2, ZIF-7 and ZIF-8 increases the CO2 permeability but the CO2/N2 selectivity decreases.

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Nafion/IL hybrid membranes with tuned nanostructure for enhanced CO₂ separation: effects of ionic liquid and water vapor

Abstract: Fully hydrated hybrid membranes based on a polyelectrolyte mixed with an ionic liquid possess gas permeation properties of significant interest for CO2 capture applications.

Cited by 66 publications

References 70 publications

Highly CO2-permeable membranes derived from a midblock-sulfonated multiblock polymer after submersion in water

Highly CO2-permeable membranes derived from a midblock-sulfonated multiblock polymer after submersion in water

Photothermal‐Responsive Microporous Nanosheets Confined Ionic Liquid for Efficient CO₂ Separation

Poly(1-trimethylsilyl-1-propyne)-Based Hybrid Membranes: Effects of Various Nanofillers and Feed Gas Humidity on CO2 Permeation

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Nafion/IL hybrid membranes with tuned nanostructure for enhanced CO2 separation: effects of ionic liquid and water vapor

Abstract: Fully hydrated hybrid membranes based on a polyelectrolyte mixed with an ionic liquid possess gas permeation properties of significant interest for CO2 capture applications.

Cited by 66 publications

References 70 publications

Highly CO2-permeable membranes derived from a midblock-sulfonated multiblock polymer after submersion in water

Highly CO2-permeable membranes derived from a midblock-sulfonated multiblock polymer after submersion in water

Photothermal‐Responsive Microporous Nanosheets Confined Ionic Liquid for Efficient CO2 Separation

Poly(1-trimethylsilyl-1-propyne)-Based Hybrid Membranes: Effects of Various Nanofillers and Feed Gas Humidity on CO2 Permeation

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Nafion/IL hybrid membranes with tuned nanostructure for enhanced CO₂ separation: effects of ionic liquid and water vapor

Photothermal‐Responsive Microporous Nanosheets Confined Ionic Liquid for Efficient CO₂ Separation