Fabrication Of Composite Membranes Research Articles

Fabrication and characterization of ceramic tubular composite membranes using slag waste materials for oily wastewater treatment

In this study, low-cost tubular ceramic membranes were fabricated by using waste slag and natural raw materials in order to decrease the manufacturing carbon footprints. The effects of incorporation of phosphorus slag (PS) and blast furnace slag (BFS) in the mullite-zeolite membrane body were investigated. The structural characteristics of the fabricated membranes were evaluated using X-ray diffraction (XRD), field emission–scanning electron microscopy (FESEM), atomic force microscopy (AFM), contact angle, porosity and average pore size analyses. Thermal and mechanical stability were studied by thermogravimetric analysis (TGA) and three-point bending test, respectively. The oily wastewater treatment tests revealed that an increase in the slag percentage from 0 to 30% leads to enhancing the permeate flux from 99 l m−2 h−1 to 349 l m−2 h−1 for PS-based tubular membrane and to 244 l m−2 h−1 for BFS-based tubular membrane under 1 bar applied. The chemical oxygen demand (COD) removal percentage of all membranes was reported almost 99% for oily wastewater feed with a COD concentration of 612 mg l−1. In addition, the investigation of membrane fouling mechanisms was carried out using Hermia models indicating that the best correlation with the experimental data is observed for the complete pore blocking model. This study presents experimental foundations aimed at enhancing the performance of affordable slag-based membranes, thus fostering their applicability in engineering contexts.

Laser Patterning of Porous Support Membranes to Enhance the Effective Surface Area of Thin-Film Composite-Facilitated Transport Membranes for CO2 Separation.

Although thin-film composite membranes have achieved great success in CO2 separation, further improvements in the CO2 permeance are required to reduce the size and cost of the CO2 separation process. Herein, we report the fabrication of composite membranes with high CO2 permeability using a laser-patterned porous membrane as the support membrane. High-aspect-ratio micropatterns with well-defined micropores on their surface were carved on microporous polymer supports by a direct laser writing process using a short-pulsed laser. By using a Galvano scanner and optimizing the laser conditions and target materials, in-plane micropatterns, such as microhole arrays, microline grating, microlattices, and out-of-plane hierarchical micropatterns, were created on porous membranes. An aqueous suspension of hydrogel microparticles doped with an amine-based mobile carrier was sprayed onto the patterned surface to form a defect-free thin separation layer. The surface area of the separation layer on the patterned support is up to 80% larger than that of flat pristine membranes, resulting in a 52% higher CO2 permeance (1106 GPU) with a CO2/N2 selectivity of 172. The laser-patterned porous membranes allow the development of inexpensive and high-performance functional membranes not only for CO2 separation but also for other applications, such as water treatment, cell culture, micro-TAS, and membrane reactors.

Composite electrospun membranes based on PET-PAN modified with LDH-hybrid as promising adsorbent for pollutants removal from wastewater

<p>The current work reveals the fabrication of a novel nanofiber composite membrane of PET-PAN modified with Mg-Al-LDH-PVA through electrospinning process. The nanocomposite membranes characterization was conducted with different techniques i.e. SEM, EDS, FTIR, XRD, and water contact angle to evaluate the structure and surface morphology. The optimized nanomembrane was utilized as a useful adsorbent for removal of toxic anionic dye Eriochrome Black T (EBT) and cationic dye Methylene blue (MB) from wastewater. Experimental results identified that PPLP3 membrane has a potential for the removal of EBT (83%) and MB (52%) at pH 3 and 7, respectively, from aqueous solution. The optimum adsorption capacity of PPLP3 nanocomposite membrane was identified and calculated as 7.3 mg.g-1 followed by the pseudo 2nd order kinetics and Langmuir adsorption isotherm fit well with R2 values of 0.964 and 0.997, respectively. The synthesized nanocomposite membrane could be utilized for effective adsorption of contaminations from different wastewaters.</p>

Pilot scale fabrication of low fouling seawater desalination thin film composite reverse osmosis membrane

We report the pilot scale fabrication of thin film composite seawater reverse osmosis membrane (TFC-SW-RO) with low fouling propensity and improved permeate flux. In situ incorporation of poly(ethylene glycol) (PEG) into the polyamide (PA) network simultaneously improves the permeate flux (effect of hydrophilic channels) and antifouling property of the membrane. The PEG chains exhibit good stability during desalination of SW (NaCl = 33,000 mg L−1, applied pressure = 55.2 bar). The mechanism of PEG stabilization into the PA layer has been elucidated on the basis of hydrogen bond formation between ether linkage of PEG and carboxylic acid group of the PA network as well as steric hindrance posed by the network. The TFC-SW-RO membrane (no PEG) in several 100 m2 batches show pure water permeance of 1.4 L m−2 h−1 bar−1 and 98.5–98.8 % NaCl rejection during SW desalination. On the other hand, TFC-SW-RO-PEG shows pure water permeance of 2.2 L m−2 h−1 bar−1 with marginal drop in NaCl rejection (98.4–98.6 %). The TFC-SW-RO-PEG membrane exhibits improved antifouling (flux recovery ratio = 87 %) property during desalination of SW as compared to that of the pristine membrane (flux recovery ratio = 67 %). This work provides an important strategy for the fabrication of SW TFC RO membrane with improved performance.

Fabrication of rice-straw lignin/polyacrylonitrile composite membrane for lithium-ion battery separator

This study outlines the successful fabrication of composite membrane using rice-straw lignin/polyacrylonitrile (L-PAN) via electrospinning method, and evaluated as a lithium-ion battery separator. L-PANs exhibited higher porosity and superior electrolyte wettability compared to the commercial Celgard 2300. Remarkably, even after exposure to 150 °C for an hour, L-PANs showed minimal changes, whereas Celgard 2300 experienced notable shrinkage. As a separator for Li/LiFePO4 batteries, L-PANs demonstrated outstanding capacity retention of 97.7 % over 200 cycles and superior cycling performance compared to Celgard 2300. Collectively, this research offers a promising approach to valorizing waste rice straw resources and expanding the application of lignin in the field of lithium-ion battery.

A review on the design and fabrication of polydimethylsiloxane thin-film composite membranes (TFCMs) for alcohol permselective pervaporation

Pervaporation-based membrane technology have gained increasing interest due to their energy efficiency and environmental sustainability. Polydimethylsiloxane (PDMS) thin-film composite membranes (TFCMs) have emerged as promising candidates for alcohol permselective applications. Compared to the development of pervaporation membrane for water purification, the optimization progress with the ethanol recovery membrane has been fairly slow and fails to meet requirements of bio-alcohol production. Despite the continuous efforts on membrane materials, the role of structural, physicochemical properties for the forming progress of selective layer on substrate is not a well-attended topic. This paper summarized the design and construction considerations of PDMS composite membranes for pervaporation from the viewpoint of the transport resistance model, including the effect of selective layer, support layer, and intermediate layer, to deeply understand and precisely regulate the preparation process. We high light the key role of crosslinking and spreading of PDMS on porous support layer in membrane fabrication. The structure-activity relationship between the separation performance of transport structure with the membrane solution properties, substrate pore structure, and the fabrication methods was discussed in detail. It was indicated that the challenges for the TFCMs applied on a pilot or industrial scale include the thickness control, coating and curing time optimization, and solvent issue. Finally, it was expected for further research to optimize the membrane fabrication process, develop novel advanced membrane materials and to explore complex and potential applications the new requirements in industry.

Progressive Insights into Metal-Organic Frameworks and Metal-Organic Framework-Membrane Composite Systems for Wastewater Management.

The sustainable management of wastewater through recycling and utilization stands as a pressing concern in the trajectory of societal advancement. Prioritizing the elimination of diverse organic contaminants is paramount in wastewater treatment, garnering significant attention from researchers worldwide. Emerging metal-organic framework materials (MOFs), bridging organic and inorganic attributes, have surfaced as novel adsorbents, showcasing pivotal potential in wastewater remediation. Nevertheless, challenges like limited water stability, elevated dissolution rates, and inadequate hydrophobicity persist in the context of wastewater treatment. To enhance the performance of MOFs, they can be modified through chemical or physical methods, and combined with membrane materials as additives to create membrane composite materials. These membrane composites, derived from MOFs, exhibit remarkable characteristics including enhanced porosity, adjustable pore dimensions, superior permeability, optimal conductivity, and robust water stability. Their ability to effectively sequester organic compounds has spurred significant research in this field. This paper introduces methods for enhancing the performance of MOFs and explores their potential applications in water treatment. It delves into the detailed design, synthesis strategies, and fabrication of composite membranes using MOFs. Furthermore, it focuses on the application prospects, challenges, and opportunities associated with MOF composite membranes in water treatment.

Facile fabrication of MOF-based composite membranes with liquid crystal ordered microstructure for effective dyes separation

High-performance membranes for effective dye/water separation are urgently desired in chemical industrial manufacture, and Metal-organic frameworks (MOFs) with abundant microporous structures are considered suitable candidates for fabricating separation membranes. However, for MOF-based membranes, maintaining superior separation efficiency while ensuring high water flux remains a challenge. In this study, a series of novel MOF-based composite materials (TFNs) and membranes oriented by electric fields (fio-TFNs) were fabricated using NH2-MIL-53(Fe), a thermotropic liquid crystal, poly (styrene-4-sulfonic acid), and polytetrafluoroethylene. The fio-TFN membranes exhibited characteristics of orientation and uniform distribution, and showed higher water flux and dye rejection compared with ordinary TFN membranes. This highlights the significant role played by the ordered orientation of liquid crystal molecules induced by the electric field in effective dye/water separation. High porosity is the basis of dye absorption, and the electrostatic interaction among structural charges and dyes is the dominant driving forces in these dye/water separation systems. The prepared fio-TFN membranes exhibited excellent performance in effective dye separation. For instance, the fio-TFN-1 membrane demonstrated high water flux (up to 255.9 L·m−2 h−1 bar−1) and excellent dye rejection rates (≥97 %, 92 %, and 82 % for methyl blue, congo red, and rhodamine B, respectively). Moreover, these prepared membranes exhibited excellent long-term stability, reusability, and flexibility, indicating their potential as high-performance separation membranes for wastewater treatment.

Fabrication of multifunctional composite nanofibrous membranes for antibacterial, waterproof, and broad-range microwave absorption properties

The scientific community has shown great interest in high-performance multifunctional nanomembranes due to their increasing demand. Nevertheless, the development of multifunctional composite nanofibrous membranes faces a limitation in achieving consistent and optimal performance with balancing conflicting requirements across multiple functionalities. However, addressing this challenge, a single composite nanofibers membrane has been successfully fabricated, demonstrating effective antibacterial activity, waterproofing properties, and excellent electromagnetic (EM) wave absorption. The multifunction composite nanofibers (CNFs0.6-Co@Fe3) exhibited remarkable microwave absorption performance, with a reflection loss (RL) of 29.10 dB at 15–20 GHz and a thickness of 1.5 mm. Additionally, the nanocomposite displayed flexibility, hydrophobicity with a water contact angle larger than 95° and low surface energy, and significant antibacterial properties against Escherichia coli (E. coli). These multifunctional nanocomposites offer a unique combination of outstanding EM wave absorption, cost-effective fabrication, environmental friendliness, and lightweight characteristics, holding great promise for future applications in nanocomposite products.

6FDA-polyimide thin-film composite hollow fiber membranes for hydrofluorocarbons and CO2 separations

Herein, high molecular weight fluorinated aromatic polyimides were assessed for the first time to recover difluoromethane (R-32) from its blends with other hydrofluorocarbons and hydrofluoroolefins (R-134a: 1,1,1,2-tetrafluoroethane, R-125: pentafluoroethane, and R-1234yf: 2,3,3,3-tetrafluoropropene). First, a screening was performed with thick flat membranes made of the 4,4’-(hexafluoroisopropylidene)diphthalic anhydride (6FDA) and three different amines: 2,2′-bis(4-aminophenyl)hexafluoropropane (6FpDA), 2,4,6-trimethyl-m-phenylenediamine (TMPD), and 2,3,5,6-tetramethyl-1,3-phenyldiamine (durene). As a result, 6FDA-TMPD was selected for the fabrication of defect-free hollow fiber-thin film composite membranes (HF-TFCM) due to its superior performance for the separation of R-32. These HF-TFCMs showed excellent separation performance to reclaim high-purity R-32 (permeate concentration >99 vol%) from the commercial binary blends R-410A and R-454B (a mixture of R-32 and R-1234yf). In addition, we report for the first time the membrane recovery of R-32 from the ternary blend R-407C (R-32/R-134a/R-125 38.2:43.8:18 vol%). Eventually, the separation of CO2 from synthetic gas mixtures of CO2/CH4 (50:50 vol%) and CO2/N2 (15:85 vol%) was performed for benchmarking, showing that the prepared HF-TFCM kept the separation performance of the 6FDA-TMPD thick membranes.

Incorporating 2D porous organic polymer nanosheets into high-temperature proton-exchange membranes for low H3PO4 loss

Phosphoric acid (PA)-doped ion exchange membranes have been recognized as a classical high-temperature proton exchange membrane (HT-PEM) material. Nonetheless, the leaching of PA from membranes occurs progressively during operation, inevitably diminishing overall performance. In this study, we present a novel approach for crafting two-dimensional porous organic polymer nanosheets (NS-POPs) synthesized through nano-interfacial azo-coupling polymerization. The prepared NS-POPs possessed different pore structures with main pore sizes of 0.55 nm and 1.19 nm, which were derived from the discrepancy of monomer structure. Subsequently, the NS-POPs were successfully incorporated into polybenzimidazole to create mixed-matrix membranes due to the good interface compatibility, characterized by homogeneity and stability facilitated by the 2D nature of NS-POPs. As a comparison, POPs with non-2D properties prepared by the solution method cannot be successfully obtained in good MMMs due to poor dispersibility and interface compatibility. Furthermore, the profusion of pore structures and the presence of N/O-rich functional groups in NS-POPs significantly enhance their PA uptake capacity with up to 289 %, consequently boosting proton conductivity. As a result, the composite membrane doped with NS-POPs demonstrated a maximum conductivity of up to 143 mS cm−1 at 180 °C, which is approximately 2.97 times that of pure membrane. And the peak power density of H2/O2 fuel cell based on the composite membrane was 378 mW cm−2, which was higher than PBI. Most significantly, the confinement effect exerted by the small pores in NS-POPs enables composite membranes to maintain a higher PA retention of up to 74 % even after a 48 h of high-temperature and high-humidity treatment. Our study introduces an innovative and straightforward approach to synthesizing porous organic polymer nanosheets. This work not only advances the understanding of the impact of interface compatibility on composite membrane fabrication, but also establishes a versatile technology for modulating pore size and managing PA leaching in HT-PEMs.

Fabrication of composite membrane with microcrystalline cellulose from lignocellulosic biomass as filler on cellulose acetate based membrane for water containing methylene blue treatment

A composite membrane based on cellulose acetate polymer with microcrystalline cellulose (MCC) based filler from lignocellulosic biomass is one of the right solutions to reduce methylene blue (MB) levels in water. MCC has been successfully isolated from water hyacinth, sengon wood, and kapok fiber with an alkalization method. The three MCCs have shown X-ray and FTIR diffraction patterns with characteristic peaks from cellulose and are stable up to 317 °C. Cellulose acetate (CA)/MCC membranes have been prepared using the phase inversion method and characterized by FTIR, tensile strength, contact angle, SEM, and porosity. The characterization results show that the addition of MCC can increase the tensile strength (3.05 N·mm-2), hydrophilicity (52°), and porosity (88 %). The CA/MCC membrane performed better than the neat membrane in separating MB. The composite membrane with MCC from kapok fiber showed optimum performance with increased flux and MB rejection up to 84 L·m−2·h−1 and 99 %, respectively.

Membrane-Based Technologies for Post-Combustion CO2 Capture from Flue Gases: Recent Progress in Commonly Employed Membrane Materials.

Carbon dioxide (CO2), which results from fossil fuel combustion and industrial processes, accounts for a substantial part of the total anthropogenic greenhouse gases (GHGs). As a result, several carbon capture, utilization and storage (CCUS) technologies have been developed during the last decade. Chemical absorption, adsorption, cryogenic separation and membrane separation are the most widely used post-combustion CO2 capture technologies. This study reviews post-combustion CO2 capture technologies and the latest progress in membrane processes for CO2 separation. More specifically, the objective of the present work is to present the state of the art of membrane-based technologies for CO2 capture from flue gases and focuses mainly on recent advancements in commonly employed membrane materials. These materials are utilized for the fabrication and application of novel composite membranes or mixed-matrix membranes (MMMs), which present improved intrinsic and surface characteristics and, thus, can achieve high selectivity and permeability. Recent progress is described regarding the utilization of metal-organic frameworks (MOFs), carbon molecular sieves (CMSs), nanocomposite membranes, ionic liquid (IL)-based membranes and facilitated transport membranes (FTMs), which comprise MMMs. The most significant challenges and future prospects of implementing membrane technologies for CO2 capture are also presented.

Scalable fabrication of amine-functionalized microgel composite membranes and their gas permeation characteristics

Post-combustion carbon dioxide (CO2) separation from exhaust gases is a bridge technology to reduce the emissions of traditional combustion processes. Primary amine-functionalized building blocks enhance the CO2 selectivity of membranes via a facilitated transport mechanism. Microgels are polymer-based colloids that can be functionalized with amine groups. However, to serve as a successful membrane building block, high aminesloading, and a scalable fabrication route are necessary. Here, we report the continuous synthesis of amine-functionalized microgels and apply them as a dense selectivity layer to form thin-film composite membranes (TFC). The synthesis process was successfully scaled up from batch to laminar flow reactor, producing microgels containing up to 50 mol% amine incorporation. Amine incorporation influences microgel water uptake important for their gas separation properties. Porous polyacrylonitrile (PAN) membranes containing a spray-coated microgel layer are tested using a mixture of CO2 and N2, with or without humidity in the feed stream. Both CO2 permeance and selectivity increase with the amine content in the microgels and the moisture in the feed stream. At 95% relative humidity, the CO2 permeance improved from 38 to 100 GPU when the amine incorporation rose from zero to 48% of 2-aminoethyl methacrylate (AEMA). The continuous synthesis allows large-scale fabrication of these microgels for applications such as membrane functionalization. Furthermore, the developed microgel-functionalized gas separation membranes are promising for CO2 removal applications from high-humidity streams, such as flue gas.

Fabrication of polymeric composite GTR membrane from eggshell powder, polylactic acid and polyethylene glycol for periodontal application: in vitro evaluation

This study aims to fabricate, characterize and evaluate Guided tissue regeneration (GTR) membrane containing eggshell (ES), chlorhexidine (CHX) and polymeric matrix for periodontal application. ES powder ground to size 74 µm was mixed in Polylactic Acid (PLA) and Polyethylene Glycol (70:30 ratios) mixture in 10% and 30% wt to fabricate the membrane and named groups C-10 and C-30. Along with this, 0.25% and 0.5% CHX powder were adsorbed on ES powder and incorporated in PLA and PEG mixture to fabricate drug containing groups C-10CHX and C-30CHX respectively. UTM was used to measure tensile strength, Young’s Modulus, and percent elongation of the prepared GTR membrane. Experimental groups containing 10% ES powder (C-10 and C-30) had adequate tensile properties. The percent mass change of the samples was calculated by the change in weight of the samples (Wd) from the weight of samples after immersion in phosphate-buffered saline PBS (Wt). Contact angle measurement showed that all membranes were found to be hydrophilic (contact angle<90). Groups containing the drug CHX (C-10CHX and C-30CHX) had significant disc diffusion antibacterial activity. Cell viability assay was carried out by Alamar Blue Assay using mouse fibroblasts NIH3T3 and pre-osteoblasts that indicated very good biocompatibility of the groups (C, C-10, C-30, and C-10CHX) while experimental group C-30CHX showed slight cytotoxicity (Cell Viability >70%).

Swift fabrication of thin-film composite membranes with azine-linked covalent organic framework for high-temperature organic solvent nanofiltration

Covalent organic frameworks (COFs) belong to a class of crystalline and porous solids that are generated by the self-assembly of reactive monomers via covalent linkage. Most existing methods for fabricating COF membranes are tedious, and they focus on quality control challenges associated with thickness uniformity, pore size, and mechanical properties. In this study, TraHz and TpaHz COF-based thin-film composite (TFC) membranes were prepared via the swift interfacial polymerization (IP) of hydrazine and aldehyde monomers on a polyacrylonitrile (PAN) support. Hydrazine played a dual role in one-pot synthesis, where PAN was crosslinked and IP was initiated. Varying the polymerization time allowed for fine-tuning the membrane thickness and performance. The membranes displayed robust high-temperature separation performance in polar aprotic solvents at temperatures of up to 80 °C. The toluene permeance of the membranes was remarkable. The permeance was highly dependent on both the applied pressure and temperature; however, the rejection performance was less dependent on these parameters. Based on the results of the nanofiltration performance evaluated using different molecular-weight dyes, a molecular-weight cut-off value of ∼650 g mol−1 and a rejection higher than 98 % for the Congo red and Chicago blue dyes in water, THF, and ethanol were observed. The dye rejection in toluene was higher than 98 % for Rhodanile blue, while maintaining high toluene permeances of 47 and 33 L m−2 h−1 bar−1 using TraHz-30 and TpaHz-30, respectively. In addition, both membranes exhibited stable separation performance. Our TFC membranes demonstrate a new approach for designing robust and high-flux nanofiltration membranes for precise molecular sieving even at high temperatures.

Fabrication of Superhydrophobic Polyvinylidene Fluoride Composite Membrane via Mussel-Inspired Coating and β-FeOOH Nanorods for Brine Treatment in Membrane Distillation

Fabrication of Superhydrophobic Polyvinylidene Fluoride Composite Membrane via Mussel-Inspired Coating and β-FeOOH Nanorods for Brine Treatment in Membrane Distillation

Gas Transport Properties of Vinylidene Fluoride-Tetrafluoroethylene Copolymers

The influence of the content of tetrafluoroethylene (TFE) groups on the gas transport properties of vinylidene fluoride (VDF) and tetrafluoroethylene copolymers has been studied. Experimental values of the permeability coefficients P and diffusion coefficients D for gases H2, He, N2, O2, CO2, as well as lower hydrocarbons CH4, C2H4 and C2H6 were measured and their solubility coefficients S were calculated. The values of the solubility coefficients of CO2 and C2H4 were found to deviate from the linear correlation of lg S on the Lennard-Jones potential. An explanation of this effect was proposed based on facilitated transport models. It was demonstrated that an increase in the content of TFE groups leads to a significant increase in the permeability coefficients of the penetrants studied mainly due to an increase in their diffusion coefficients. So, the permeability coefficient of helium and hydrogen increases approximately in 2.5 times, for carbon dioxide in 3 times, for argon, oxygen, methane and ethylene in 3.5 times, and for nitrogen and ethane in 4.4 times, respectively. These gas separation parameters in combination with good film-forming properties and commercial availability allows us to consider the studied VDF-TFE copolymers as promising materials for the fabrication of composite gas separation membranes.

Rapid fabrication of composite membranes based on conjugated microporous polymers: Microstructural design for performance optimization

Composite membranes based on conjugated microporous polymer (CMPs) with permanent porosity and high tolerance to harsh environments have been considered as one of the most promising separation methods to treat wastewater. Nevertheless, using simple and low-cost methods to accomplish the rapid fabrication of CMPs-based membranes with excellent performance is challenging. Herein, unidirectional diffusion synthesis in diffusion cells of different inner diameters achieved the rapid fabrication and adjustable size of three CMPs-based composite membranes (i.e., TpMa-H, TpMa-CH3 and TpMa-Cl). Among them, TpMa-CH3 or TpMa-Cl was obtained by replacing -H of Carbon 4 in the amine moieties of TpMa-H with -CH3 or -Cl groups. This microstructural design enhanced the rejection rates of TpMa-CH3 and TpMa-Cl to model waste molecules compared with TpMa-H. In addition, the composite membranes had strong hydrolytic resistance, thermal stability and acid-base resistance. Interestingly, TpMa-CH3 showed better rejection to positively charged methyl violet (Mw.358) than that to negatively charged sodium cresol (Mw.404), probably due to the electrostatic adsorption of bigger positive portion of methyl violet on the membrane surface and resultant bridging effect. Such electrostatic adsorption and the adjustable microstructures significantly varied the repellence of CMPs-based membranes to different charged molecules. This work provides a beneficial idea to optimize the separation performance of the CMPs-based membrane.

Pore-optimized MOF-808 made through a facile method using for fabrication of high-performance mixed matrix composite CO2 capture membranes

Mixed matrix composite membranes (MMCMs) are considered as one of the potential directions for the development of CO2 capture membranes. Nevertheless, the high cost and the challenging nature of improving separation performance are significant obstacles that prevent MMCMs from being widely applied in practice. In this study, we developed a cost-effective modified pore-optimized MOF-808 (MOF-808@PVAm) and utilized it to fabricate high-performance CO2 capture MMCMs. Specifically, MOF-808 and polyvinylamine (PVAm) were cross-linked by γ-(2,3-epoxypropoxy) propytrimethoxysilane (KH-560), which improved the pore structure characteristics of MOF-808 and led to high-performance MMCMs. For 2 bar feed gas (CO2/N2, 15/85), the MMCM with 33.33 wt.% MOF-808@PVAm loading displayed remarkable CO2 permeance of 2753 GPU and selectivity of 181. The prepared MMCM demonstrated good operational stability in simulated flue gas and exhibited potential for application in various gas purification fields (CO2/CH4, CO2/H2) through gas permeation tests.