Improved Gas Separation Performance Research Articles

Improving gas separation performance by boron nitride nanotubes

The performance of boron nitride nanotubes (BNNTs) and carbon nanotubes (CNTs) in multiple gas separation systems was systematically compared using molecular simulation methods. Findings reveal that under conditions of 298 K and 2 MPa, BNNTs generally show higher adsorption selectivities than CNTs for CH4/N2, CO2/CH4, and CO2/N2 mixtures. Notably, in the CO2/CH4 system, BNNTs exhibit a selectivity of up to 350 at a radius of 0.48 nm, significantly surpassing the 14 observed for CNTs; in the CO2/N2 system, selectivity can reach as high as 969 for BNNTs, contrasting with the 69 for CNTs. Furthermore, BNNTs achieve saturation adsorption for CF4 at 0.04 MPa with a capacity of 2.7 mmol/g, while CNTs show a higher adsorption capacity for N2, reflecting the superior selective adsorption capability of BNNTs for specific gases. Analysis of nanotubes with different chiral configurations led to the recommendation of (11,11) and (7,7) chiralities as optimal structures for efficient gas separation. Fluctuations in energy contributions from fluid-wall interactions in BNNTs, are closely related to their selectivity fluctuations. The results demonstrate that BNNTs, due to their unique structural characteristics, possess significant potential in the field of gas adsorption and separation, particularly in enhancing the selective adsorption of CO2 and CF4.

Huge improved gas separation performance of carbon molecular sieve membrane by forming a double crosslinked polyimide precursor

A vital issue in searching for advanced gas separation membranes is understanding the precursor structure-gas separation properties of carbon molecular sieve (CMS) membranes. Here, we reported two crosslinked polyimides and used as CMS precursors, in which, the DCPI-4 is a double cross-linkable polyimide with 4 % triptycene triamine as a crosslinker (Type I) and COOH group that can be crosslinked at 350 °C by decarboxylation (Type II), whereas the DCPI-0 with COOH (Type II). After pyrolysis at 550 °C, the DCPI-4-CMS showed a higher SBET (812 vs 713 m2g-1), larger ultra-microporosity ratio (26.6 % vs 17.8 %), larger d-spacing (4.08 vs 3.94 Å), less graphitization (sp3/sp2 of 0.156 vs 0.118), 5.5 times higher CO2 permeability (7573 vs 1391 Barrer) and same CO2/CH4 selectivity (∼62) than DCPI-0-CMS. We consider this is due to the type I crosslinking enhances the rigidity of the polyimide backbone, and inhibits the collapse of micropores during the carbonization, which causes improved ultra-microporosity and ultra-micropore ratio that both enhances the gas diffusion and solubility coefficient as well activation energy difference of gas pairs. Conclusively, this double crosslinking method provides a good perspective for achieving CMS membranes with excellent gas separation performance.

Nanoporous Ti3C2O2 monolayer towards high permeance and selectivity for CO2/N2 separation: CO2-MXene interaction tuning

MXene, as a new gas separation membrane, has good stability and suitable pore topological structures to mitigate the greenhouse effect caused by excessive CO2 emission. However, the large quadrupole and polarizability of CO2 make it a strong interaction with MXene, thus leading to a strong solubility and weak diffusivity of CO2. Here, we design nanoporous Ti3C2O2 monolayers (YmXn) with exposed C atoms that could tune CO2-Ti3C2O2 interaction so as to improve gas separation performance by density functional theory and molecular dynamics simulation. The scope of “Cut-off” size is obtained by analyzing the gas separation state from un-permeation to permeation. Results reveal that nanoporous Ti3C2O2 membranes achieve both outstanding CO2 selectivity and permeance. The best-performance Y3X3-Ti possesses CO2 permeance of 1.01 × 10-4 and 2.56 × 10-5 mol s−1 m−2 Pa−1 for equimolar gas mixtures and flue gases, respectively, and both the CO2/N2 selectivity reach 100 %. The gas separation mechanism is dominated by diffusion selectivity rather than solution selectivity in nanoporous Ti3C2O2. The dynamic processes of gas permeation, including the center of mass, mean square displacement, and radial distribution function of the gases, are precisely investigated. The electrostatic repulsion between the C atoms in the channel of the membrane and CO2 follows the sequence Y3X3-C > Y2X4 > Y3X3-Ti, which is the key to regulating gas diffusion. Results of this work highlight that tuning gas-membrane interaction and designing “Cut-off” size are effective strategies to achieve excellent CO2 separation performance, and shed new light on the intrinsic mechanism in high-performance gas separation membranes.

Research advances of cardo fluorene-based polymer based membranes for gas separation

Gas membrane separation has become one of the technologies to solve major problems in energy, environment and other fields. As the foundation and core of membrane separation technology, high performance membrane materials have always been the focus of research. Membranes based on organic polymer materials are the main commercial gas separation membranes due to their advantages of high design freedom, easy membrane formation and low cost. However, the application of most membranes based on polymer materials are limited by the mutual restriction between permeability and selectivity. The introduction of large volume and twisted groups into the polymer chain can effectively improve gas separation performance. Fluorenyl shows unique large space volume and rigid twisted structure, the introduction of which in polymers will limit the free rotation of the polymer backbone, forming loose accumulations of chain to increase the free volume, eventually improving the gas separation performance of the membranes. Therefore, fluorenyl is favored in the field of gas separation membranes. In this paper, the recent studies on membranes based on fluorene-based polymer materials in the field of gas separation are reviewed. These researches are classified by the structure of polymer materials that make up the membranes and introduced in terms of synthesis, separation mechanism and performance. Finally, the future research directions of fluorene-based polymer gas separation membrane is prospected.

Tailoring the CH4/CO2/N2 separation performance of ultrapermeable polymeric composite membranes by altering the concentration of Pd/g-C3N4

Effectively tailoring the interfacial interaction between the nanoadditives and polymer matrix to develop defect-free membrane is the key parameter to fabricate mixed matrix membranes (MMMs) with improved gas separation performance. Here, MMMs were successfully fabricated by using Pd/g-C3N4 as a nanoadditive for the separation of CO2/CH4 and CO2/N2 gas mixtures. The g-C3N4 with palladium provides more compatible structure to the MMMs. The addition of Pd/g-C3N4 nanoadditive introduces additional functional groups into the membrane matrix which induces the permeability of the molecules. The Pd/g-C3N4:PSf MMMs exhibited better thermal, mechanical stability and gas permeability than the bare polysulfone (PSf) membrane. The MMM loaded with 300 mg of the nanoadditive exhibited greater permeability than unfilled membrane which is nearly 5 times for CH4, 4 times for N2 and 10 times for CO2 at 2 bar pressure with selectivity of 5.25 for CO2/CH4 and 2.15 for CO2/N2 mixtures. The permeability of the CO2 molecules is higher than the N2 and CH4 molecules because of its smaller kinetic diameter. The Pd/g-C3N4 nanoadditive exhibited microporous nature with presence of nitrogen-rich functional groups which develops CO2-philic functional groups in MMMs. These findings emphasize the unique properties of Pd/g-C3N4 nanoadditive in MMMs towards pure and mixed gas permeability and separation. This simplistic approach to modulate PSf membrane via Pd/g-C3N4 addition promotes the practical design of highly effective gas separation membranes.

Synergistic Effect of 2D ZIF Loading and Ionic Liquid Modification on Improving Gas Separation Performance of PES-Based Mixed Matrix Hollow Fiber Membrane

Synergistic Effect of 2D ZIF Loading and Ionic Liquid Modification on Improving Gas Separation Performance of PES-Based Mixed Matrix Hollow Fiber Membrane

Two morphology distinct fillers with chemical similarity incorporated into Tröger’ base polymers towards enhanced gas separation

Mixed matrix membranes (MMMs) with one class of fillers always require high loadings to maximize gas permeability. The incompatibility between polymers and high content fillers causes non-selective interfacial voids in the MMMs and poor mechanical properties of MMMs. This work adopts two morphology distinct fillers with chemical similarity to achieve improved gas separation performance of Tröger’ base membranes without sacrificing their mechanical properties. The three-dimensional ZIF-8 nanoparticles are beneficial for membrane gas permeability. The addition of low content ZIF-8 nanosheets can greatly improve H2/CH4 and CO2/CH4 selectivities of the membranes. ZIF-8 particles and ZIF-8 nanosheets with similar chemical properties can mix more homogeneously and disperse well in the polymer matrix with expected hydrogen bonding interaction compared to mixed ZIF-8 and CuBDC nanosheets. Eventually, the resulting dual filler MMMs doped with 4 wt% ZIF-8 nanosheets and 10 wt% ZIF-8 nanoparticles have H2/CH4 ideal selectivity of 60 with H2 permeability of 426 Barrer, which is an increase of 18% and 102% over pure membranes, respectively. Moreover, the membrane has a significantly enhanced CO2/CH4 mixed gas selectivity of 68 at sub-ambient temperature, accompanied by temperature-dependent CO2-induced plasticization behavior. Mixing morphology distinct fillers with chemical similarity is proved to be an effective method to prepare a robust MMM at low filler amounts, and the synergistic effect on gas permeability and selectivity endows these dual filler MMMs with great H2/CH4 and CO2/CH4 separation performance.

Remarkably Improved Gas Separation Performance of Polyimides by Forming “Bent and Battered” Main Chain Using Paracyclophane as Building Block

Remarkably Improved Gas Separation Performance of Polyimides by Forming “Bent and Battered” Main Chain Using Paracyclophane as Building Block

Evaluation of different carbon-modified zeolite derivatives preparation methods as a filler in mixed matrix membrane on their gas separation performance

Carbon-modified zeolite from different preparation methods, including impregnation and chemical vapor deposition (CVD), was investigated and applied as fillers in polysulfone (PSF) membranes in order to improve gas separation performance. Using the impregnation method and CVD, carbon structures were added into the zeolite template. These fillers are zeolite composite carbons (ZCC). After removing the template, zeolite-templated carbons (ZTC) were obtained and analyzed with XRD, SEM, and the N2 adsorption-desorption isotherm. In addition, further investigations were carried out in MMMs embedded by these fillers with XRD, FTIR, TGA, DSC, and gas permeation tests. PSF/ZTC synthesized using CVD demonstrated favorable improvement, which enhanced the gas permeances and CO2/CH4, O2/N2, H2/CH4, and CO2/N2 selectivity up to 107.66%, 24.79%, 140.56%, and 18.55%, respectively. The improvement in gas selectivity was contributed by the high microporosity of the filler. Moreover, the proposed gas diffusion mechanism in MMMs was elucidated, which was dominated by Knudsen and surface diffusion. It was interesting to note that the use of a very small percentage of ZTC-C loading was sufficiently considered to provide a high enhancement compared to those for a high percentage of loading with different fillers. Therefore, the CVD process is more promising for preparing zeolite-carbon fillers to boost gas separation performance and opens up possibilities for further development of advanced membranes.

Methylene diisocyanate - aided tailoring of nanotitania for dispersion engineering through polyurethane mixed matrix membranes: Experimental investigations

The present focus of environmental science is centred on addressing the significant and controversial challenge of separating acid gases. As a result, scientists are actively engaged in developing high-performance membranes that can effectively transport gases. An important factor in achieving superior gas separation efficiency is the ability to control the rate of chemical component penetration through the membrane. This has led to an increasing interest in mixed matrix membranes (MMMs) that contain inorganic nanoparticles homogeneously dispersed within the polymer matrix, which are becoming a popular alternative to traditional polymeric membranes. In this work, the morphological properties of polyurethane (PU) membrane treated with titanium dioxide (TiO2), which is functionalized with methylene diisocyanate (MDI), were studied, and its gas transport properties, like selectivity and permeability, were evaluated. FTIR, XRD, TG, DTG, and SEM analyses were performed for neat and MMMs to study their morphological properties in phase I of the research. Our results showed that MDI modification improved the dispersion of TiO2 in the PU matrix, resulting in a more uniform and compact membrane structure. Moreover, gas permeability results showed that incorporating up to 1 wt% of unfunctionalized and functionalized TiO2 into the PU matrix enhanced the CO2/N2 selectivity by 71.69% and 78.42%, respectively. Overall, this study demonstrated the potential of MDI-aided tailoring of TiO2 for dispersion engineering in PU MMMs, which can lead to improved gas separation performance. The findings have implications for developing advanced materials for gas separation applications, particularly in industrial processes such as natural gas purification and carbon capture.

Tuning interchain cavity of fluorinated polyimide by DABA for improved gas separation performance

Fluorinated polyimides with biphenyl structure and –CF3 with rigid chain structure exhibit great potential in membrane-based gas separation. However, the comprehensive separation performance of this type polyimides is not competitive as a gas separation material. Structure regulation is of great significance to improve the separation performance of polymer membrane. Few studies systematically investigated structure-property relationships in fluorinated polyimide structure. In this study, carboxylic groups are introduced into a fluorinated polyimide(6FDA-TFMB) via copolymerization with DABA diamine monomer. The hydrogen bond between –CF3 group in TFMB and –COOH group in DABA is proposed to enhance chain segment rigidity and optimize polymer chain arrangement. WAXD results and FFV data indicate that inter-chain cavity of fluorinated polyimide could be finely tuned by adjusting molar ratio of TFMB and DABA in the copolyimide. The resulted copolyimide membranes thus demonstrate tunable gas permeation properties. Gas permeability of 6FDA-TFMB/DABA firstly increases and then decreases, and ideal gas selectivity continuously increases with increasing DABA molar ratio. Among the polyimides, 6FDA-TFMB/DABA(6:4) membrane demonstrated superior separation performance, e.g. CO2 permeability of 135.6 Barrer and CO2/CH4 ideal selectivity of 31.6, surpassing the commercial cellulose acetate and Matrimid membrane. Attributed to the optimized interchain interaction, the 6FDA-TFMB/DABA (6:4) membrane displays an optimized CO2 plasticization resistance and physical aging in comparison with 6FDA-TFMB membranes. This study provides a guideline for controlling and optimize the performance of biphenyl fluorinated polyimide gas separation membrane.

Advanced carbon molecular sieve membranes derived from molecularly engineered cross-linkable copolyimide for gas separations.

Carbon molecular sieve (CMS) membranes with precise molecular discrimination ability and facile scalability are attractive next-generation membranes for large-scale, energy-efficient gas separations. Here, structurally engineered CMS membranes derived from a tailor-made cross-linkable copolyimide with kinked structure are reported. We demonstrate that combining two features, kinked backbones and cross-linkable backbones, to engineer polyimide precursors while controlling pyrolysis conditions allows the creation of CMS membranes with improved gas separation performance. Our results indicate that the CMS membranes provide a versatile platform for a broad spectrum of challenging gas separations. The gas transport properties of the resulting CMS membranes are interpreted in terms of a model reflecting both molecular sieving Langmuir domains and a disordered continuous phase, thereby providing insight into structure evolution from the cross-linkable polyimide precursor to a final CMS membrane. With this understanding of CMS membrane structure and separation performance, these systems are promising for environmentally friendly gas separations.

Improved gas separation performance of Pebax®1657 membrane modified by poly-alcoholic compounds

Poly (ether-block-amide) or Pebax is one of the most promising copolymers employed for CO2 separation. The existence of polyamide and polyether segments within the total matrix gives superior properties to Pebax, providing it significant CO2 permeation compared to the other light gases such as CH4 and N2. However, improving the separation performance of Pebax is one of the major concerns in developing new membranes. Compounds with hydroxyl and carboxyl groups are listed as appropriate candidates to be embedded within the Pebax matrix, finally enhancing the CO2 separation. Such compounds with oxygen atoms (negatively charged) can interact with the central carbon (positively charged) of CO2 via Lewis acid-base interactions, which contributes to further CO2 permeation. In this study, Pebax®1657, which has a good performance in CO2 separation, was blended with maltitol and mannitol as multi-hydroxyl compounds. Pebax/mannitol and Pebax/maltitol blend membranes were prepared by solution casting/solvent evaporation method, and their CO2 separation performance from N2 and CH4 was studied. Changes in chemical bonds, thermal properties, and cross-sectional morphology of the membranes were investigated using FTIR, DSC, TGA, FESEM and XRD analysis. The gas permeability results showed that the highest permeability of CO2 was 341.27 barrer and 228.64 barrer, which are related to Pebax/maltitol (20 wt%), and Pebax/mannitol (20 wt%) at a temperature of 30 °C and feed pressure of 10 bar, respectively. In addition, the highest selectivity of 66.65 (CO2/N2) and 23.95 (CO2/CH4) was obtained for Pebax/maltitol (20 wt%). Likewise, selectivity values of 67.84 for CO2/N2 and 25.49 for CO2/CH4 were obtained with Pebax/mannitol (20 wt%), at a pressure of 10 bar.

Template Removal and Surface Modification of an SSZ-13 Membrane with Heated Sodium Chloride for CO2/CH4 Gas Separation

Hydrothermal synthesis with an organic template of N,N,N trimethyl-1-adamantammonium hydroxide (TMAdaOH) is the most commonly used method to prepare an SSZ-13 zeolite membrane. In this paper, the synthesized membrane was treated in heated sodium chloride to remove TMAdaOH instead of calcination in air. The surface of the membrane was modified by the heated NaCl and resulted in an improved CO2/CH4 gas separation selectivity. TMAda+ in the channels of SSZ-13 zeolite decomposed completely, and the treatment time was shortened significantly compared with calcination in air. The recrystallization of zeolite reacting with heated NaCl was the possible reason for the improved gas separation performance of the membrane.

Gas transport characteristics of supramolecular networks of metal-coordinated highly branched Poly(ethylene oxide)

Model systems are developed and investigated to better understand the effect of polyether-metal ion interactions on gas separation characteristics. These systems help answer current questions raised by the substantial body of research on metal-organic frameworks (MOFs) dispersed in polyethers to improve gas separation performance, where favorable interactions between the metal centers and polyethers are preferred to improve interfacial compatibility. Specifically, we investigate CO2/gas transport properties of supramolecular networks comprising cross-linked poly(ethylene oxide) (XLPEO) and dissociable salts, including LiClO4, Ni(BF4)2, and Cu(BF4)2. Increasing the salt content increases the glass transition temperature (Tg) and generally decreases gas diffusivity and permeability, which can be successfully described using a Tg-integrated free volume model with an expression similar to the Vogel-Tammann-Fulcher (VTF) equation. Surprisingly, low loadings of LiClO4 and Cu(BF4)2 (2 mass% or less) can increase gas permeability by 30%–70% without affecting the CO2/gas selectivity. This increase correlates with polyether-metal ion dynamics as measured by dielectric spectroscopy. Understanding how interaction-mediated dynamics affect gas transport will be instrumental to designing MOF-based mixed matrix materials for gas separations.

Structural engineering on copolyimide membranes for improved gas separation performance

The structural engineering and design of 6FDA/BPDA-based copolyimide membranes at a molecular level are developed to achieve advanced membrane materials with improved CO2 plasticization resistance as well as high gas separation performance. The commercially available diamine monomers with/without various electronegative groups (-CH3, –CF3 and -Cl) have been employed to prepare 6FDA/BPDA-based copolyimides via the one-step method. All of the copolyimides show excellent solubility in the common solvent, film-forming ability and thus mechanical properties. More interestingly, the intermolecular charge transfer complex (CTC) effects is finely tuned as confirmed by the fluorescence emission spectrum. The introducing of polar chloride groups in the copolyimides could significantly strengthen the CTC effects to prevent the intrusion of condensable CO2 and limit polymeric chain movements. Thus, the membrane based on the 2,2′,5,5′-tetrachlorobenzidine (e.g. 6FDA:BPDA-TSN:TCDB (1:1:1:1)) shows the best carbon dioxide (CO2) plasticization resistance and slowest physical aging without sacrificing gas separation performance versus the membrane having weak polar groups. The CO2 plasticization pressure as high as 350 psi has been observed for the 6FDA:BPDA-TSN:TCDB membrane with polar chloride groups. This value is much higher than that of the copolyimide membranes with –CH3 or –CF3 groups ranging from 100 psi to 200 psi. Moreover, this membrane shows a good gas separation performance, e.g. CO2 permeability of 45.7 barrer and CO2/CH4 ideal selectivity of 35.2 surpassing the commercial cellulose acetate and Matrimid. Such structurally defined polymer with good mechanical strength, plasticization resistance and solubility harnesses the full potential of promising gas separation membrane materials for hollow fiber spinning. This work offers structural engineering guidance for the preparation of high-performance polymers with good tolerance to CO2-induced plasticization.

Fast fabrication of freestanding MXene-ZIF-8 dual-layered membranes for H2/CO2 separation

As one of the green, renewable, and clean energy resources, hydrogen is widely developed and utilized throughout the world. Highly efficient membrane separation for hydrogen production is required to give promising gas permeance with enough H2 selectivity. The membranes are desired to be produced in large-scale, fast and facile methods. Here we report for the first time a kind of freestanding MXene-ZIF-8 dual-layered membrane for hydrogen separation. Fast synthesis of such membranes is realized by combining electrophoretic deposition (EPD) and fast current-driven synthesis (FCDS), achieving the assemble of MXene layer and growth of ZIF-8 layer, respectively, overcoming the traditional time-consuming vacuum filtration methods and solvothermal synthesis. The MXene-ZIF-8 dual-layered membrane prepared within 20 min exhibits significantly improved gas separation performance, whose H2/CO2 selectivity increases from 44 for the pristine MXene membrane to 77 with H2 permeance of 5.97 × 10−8 mol m−2 s−1 Pa−1. This concept of structure design of membrane can also be extended to other dual-layered membranes, including various 2D nanosheet layers combined with different MOF layers.

Synthesis of ZIF-11 Membranes: The Influence of Preparation Technique and Support Type.

Due to its structural features, ZIF-11 is one of the most interesting materials for gas separation applications. Herein, we report a systematic study on the synthesis of ZIF-11 as a supported membrane. For this, we adapted optimized conditions for the ZIF-11 powder synthesis, identified in our previous works, to form ZIF layers on symmetric and asymmetric stainless-steel and asymmetric α-Al2O3 supports. Different techniques were investigated for the challenging layer formation, namely, in situ crystallization (ISC), multiple in situ crystallization (MISC), and the seeding and secondary growth (SSG) method. It was possible to deposit ZIF-11 on different supports by ISC and MISC, although it was difficult to obtain complete layers. SSG, in turn, was more effective in forming dense and well-intergrown ZIF-11 layers. This agrees well with the generally accepted fact that seeding considerably facilitates layer formation. Systematic studies of both individual steps of SSG (seeding and secondary growth) led to a basic understanding of layer formation of ZIF-11 on the different supports. The best membranes prepared by rub seeding and secondary growth achieved Knudsen selectivity. Improved gas separation performance is expected if the formation of defects can be avoided.

Sealing Tröger base/ZIF-8 mixed matrix membranes defects for improved gas separation performance

Manufacturing defect-free mixed matrix membranes (MMMs) especially with high nanoparticle concentrations exceeding 40 wt% is still an ongoing challenge. Desired performance improvements are often unfulfilled in MMMs with high filler loading because nanoparticles with increasing contents are prone to aggregating, forming non-selective cavities, and deteriorating membrane's mechanical properties. To address this key issue, our work develops MMMs using Tröger base (TB) polymer with more hydrogen bond acceptors, polydopamine (PDA), and ZIF-8 fillers. The PDA modified ZIF-8 to create TB/ZIF-8 MMMs especially with high ZIF-8 loading over 40 wt% improves membrane mechanical properties and completely seals structural defectives to demonstrate encouraging gas selectivities. Hydrogen bonding between CN:NH and CN:OH groups within TB polymers and PDA enhances ZIF-8 interactions and reduces particle agglomeration within the polymer matrix. A TB/ZIF-8@PDA MMM containing 50 wt% ZIF-8 has H2 and CO2 permeabilities of 664.1 and 277.3 Barrer. Its ideal H2/CH4 and CO2/CH4 selectivities are 37.7 and 15.5, respectively. Equal molar CO2/CH4 mixed gas tests at various pressures demonstrate strong CO2 plasticization resistance and enhanced CO2/CH4 gas selectivity over ideal selectivity within the membranes. The combination of PDA modification technique on filler surfaces and a polymer with many hydrogen bonds acceptors is not only a feasible route to fabricate high filler loading MMMs with sealed defective structures, but also demonstrates positive impacts on membrane mechanical properties.

Ionic Liquid Blend Thin Film Composite Membrane for Carbon Dioxide Separation

To utilize the superior properties of ionic liquid (IL), this work developed thin film composite (TFC) membrane incorporated with [EMIM][Tf2N] prepared via interfacial polymerization (IP). The effect of IL on membrane properties and CO2/CH4 separation performance were studied. The IL loading was varied from 1-5wt%. The fabricated membranes were characterized and the gas separation performance of the membranes was evaluated in term of CO2 permeability and CO2/CH4 selectivity. Analysis from Fourier-transform Infrared Spectroscopy (FTIR) shows the presence of [EMIM][TF2N] functional groups proving the successful attachment of the IL in the membrane. Furthermore, it is noted that with increasing IL loading up to 3vol%, the surface morphology became rougher and the membrane became more rigid based on the Differential Scanning Calorimeter (DSC) thermogram and Atomic Force Microscopy(AFM) analysis, accordingly. Based on the gas permeation test at 1 bar feed pressure, membrane with 5wt% of IL showed CO2 permeability of 3424.44 GPU and CO2/CH4 selectivity of 32.15. Compared to pure TFC membrane, TFC/IL membranes showed as much as 103 times and 32 times improvement for CO2 permeability and CO2/CH4 selectivity, accordingly. The improved gas separation performance shows promising results of incorporating IL in TFC membrane for CO2 separation.