Preparation and characterization of polyimide membranes modified by a task-specific ionic liquid based on Schiff base for CO2/N2 separation

Bei, Pengzhi; Liu, Hongjing; Zhang, Ying; Gao, Yingjia; Chi, Zhi-Qiang; Chen, Yanming

doi:10.1007/s11356-020-10533-5

Cited by 14 publications

(3 citation statements)

References 67 publications

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“…Numerous studies [17,18] have been conducted to determine that the chemical makeup of polyimides affects their gas penetration characteristics. However, the PI membrane is influenced by the "trade-off" effect between permeability and selectivity [19][20][21], and it is challenging to overcome the Robeson upper bounds [22,23]. As a consequence, there are numerous strategies by which to increase gas permeability and selectivity, including molecular design [24,25], inorganic inclusion [26,27], chemical crosslinking [28], and the blending of organic species [29][30][31][32][33], among others.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Polyimide/Ionic Liquid Hybrid Membrane for CO2/CH4 Separation

Du,

Zhao,

et al. 2024

Polymers

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Imidazole ionic liquids (ILs) have good affinity and good solubility for carbon dioxide (CO2). Such ionic liquids, combined with polyimide membrane materials, can solve the problem that, today, CO2 is difficult to separate and recover. In this study, the ionic liquid (IL) of 1-ethyl-3-methylimidazolium tetrafluoroborate (IL1), 1-pentyl-3-methylimidazolium tetrafluoroborate (IL2), 1-octyl-3-methylimidazolium tetrafluoroborate (IL3), and 1-dodecylimidazolium tetrafluoroborate (IL4) with different contents were added to a polyimide matrix, and a series of polyimide membranes blended with ionic liquid were prepared using a high-speed mixer. The mechanical properties and gas separation permeability of the membranes were investigated. Among them, the selectivity of the PI/IL3 membrane for CO2/CH4 was 180.55, which was 2.5 times higher than the PI membrane, and its CO2 permeability was 16.25 Barrer, which exceeded the Robeson curve in 2008; the separation performance of the membrane was the best in this work.

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Section: Introductionmentioning

confidence: 99%

Preparation of Polyimide/Ionic Liquid Hybrid Membrane for CO2/CH4 Separation

Du,

Zhao,

et al. 2024

Polymers

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“…4,5 In recent years, researchers have prepared mixed matrix membranes (MMMs) by filling dopants into polymer substrates, and tried to overcome the trade-off effect by taking advantage of the respective performance advantages of dopants materials and polymer materials. 6 Up to now, the commonly used dopants mainly include nano metal oxides (Al 2 O 3 , SiO 2 , TiO 2 ), 7 carbon nanotubes (CNTs), 8 graphene oxide (GO), 9,10 MOFs, 11,12 ionic liquids, 13,14 etc. Pebax, as a common membrane matrix, has often been used to prepare MMMs due to its special properties.…”

Section: Introductionmentioning

confidence: 99%

Preparation ofAl₂O₃/PDA/Pebax membrane modified by (C₃NH₂MIm)(PF₆) for improvingCO₂separation performance

Yan

Liu

et al. 2022

J of Applied Polymer Sci

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Mixed matrix membranes (MMMs) are currently the focus of research due to their possible high separation performance in separating CO 2 process. However, inorganic nanomaterials are easy to agglomerate so as to affect CO 2 separation performance. In order to overcome the agglomeration of nanomaterials in MMMs, a new filler, Al 2 O 3 /PDA-TIL, was prepared, in which ionic liquid (TIL) was introduced on the surface of nano-Al 2 O 3 by TIL grafting polydopamine coated on aluminum oxide. And a new type of Al 2 O 3 /PDA-TIL/ Pebax MMMs membrane was prepared by the blend of new fillers and Pebax.The properties of MMMs prepared were characterized by SEM, FTIR, XRD, XPS, etc. Results showed that TIL had reacted with PDA to form Schiff base structure, indicating that TIL had been successfully grafted onto PDA coated on Al 2 O 3 . As a result, TIL on the surface Al 2 O 3 successfully reduced the agglomeration of Al successfully reduced the agglomeration of Al 2 O 3 in the membrane and improved the separation of CO 2 . The gas permeability test results showed that the CO 2 permeability of MMMs increased from 60.69 Barrer to 101.12 Barrer, and the CO 2 /N 2 selectivity increased from 49.34 to 79 at 30 C and 0.1 MPa. Therefore, Al 2 O 3 /PDA-TIL/Pebax membrane has a good application prospect in CO 2 separation process.

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“…The concentration of atmospheric carbon dioxide (CO 2 ), one of the principal emissions found in greenhouse gases, has increased year after year with the technological progress of human society and industrial development. 1 Therefore, the global environment has suffered many adverse effects, such as climate warming, intensifying thermal stress, increases in storm frequency and ocean acidity. 2 Thus, it has been seen as a matter of urgency to develop suitable CO 2 separation technology.…”

Section: Introductionmentioning

confidence: 99%

Preparation and gas separation performance of polyimide membranes endcapped with ionic liquid-type structures

Jia

Zhao

Jiang

et al. 2022

High Performance Polymers

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A set of ionic liquid capped polyimide membranes was prepared using 1-aminoethyl-3-methylimidazolium hexafluorophosphate (IL1) and 1-aminopropylimidazolium bis(trifluoromethylsulfonyl)imine (IL2) as the terminal groups. The products’ molecular weights, mechanical properties, and separation permeability (CO2/CH4) were investigated. For CO2/CH4 separation, the selectivity of the ionic liquid capped polyimide membranes was higher than that of noncapped ones. Among them, the membrane synthesized by 4.4′- diaminodiphenyl ether and 4.4′-(hexafluoroisopropyl) diphthalic anhydride (6FDA) as monomer, with IL1 as terminal group, displayed the best selectivity. Its permeability was 7.47 Barrer and selectivity 102.42, which exceeded the 1991 Robeson curve. Polyimide membranes capped by ionic liquid showed high gas selectivity and good gas permeability as well as good physical and chemical properties. Consequently, it can be concluded that introducing an ionic liquid structure to polyimide chains could make attractive membrane materials for various gas separation and related applications.

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Preparation and characterization of polyimide membranes modified by a task-specific ionic liquid based on Schiff base for CO2/N2 separation

Cited by 14 publications

References 67 publications

Preparation of Polyimide/Ionic Liquid Hybrid Membrane for CO2/CH4 Separation

Preparation of Polyimide/Ionic Liquid Hybrid Membrane for CO2/CH4 Separation

Preparation ofAl₂O₃/PDA/Pebax membrane modified by (C₃NH₂MIm)(PF₆) for improvingCO₂separation performance

Preparation and gas separation performance of polyimide membranes endcapped with ionic liquid-type structures

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Preparation and characterization of polyimide membranes modified by a task-specific ionic liquid based on Schiff base for CO2/N2 separation

Cited by 14 publications

References 67 publications

Preparation of Polyimide/Ionic Liquid Hybrid Membrane for CO2/CH4 Separation

Preparation of Polyimide/Ionic Liquid Hybrid Membrane for CO2/CH4 Separation

Preparation ofAl2O3/PDA/Pebax membrane modified by (C3NH2MIm)(PF6) for improvingCO2separation performance

Preparation and gas separation performance of polyimide membranes endcapped with ionic liquid-type structures

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Preparation ofAl₂O₃/PDA/Pebax membrane modified by (C₃NH₂MIm)(PF₆) for improvingCO₂separation performance