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Highlights: [•] Effects of tapioca starch and CGTase concentrations on the yield of CDs were studied. [•] Production of CDs in an EMR. [•] The weak adsorption (ra1 ) was the major fouling mechanism. [ABSTRACT FROM AUTHOR]

Highlights: [•] Different amount of SMM were used to improve the surface hydrophobicity of PVDF HFM. [•] Average pore size and contact angle increased by increasing SMM concentration. [•] The fabricated PVDF HFMs were used in contactor application for CO2 absorption. [•] The CO2 flux of the hollow fiber increased by increasing SMM concentration. [•] The membrane mass transfer resistance decreased by enhancement of SMM concentration. [Copyright &y& Elsevier]

Abstract: Carbon dioxide (CO2) stripping from water was conducted through the porous asymmetric polysulfone (PSf) hollow fiber membrane contactor. The effect of the liquid and gas flow rates on the stripping performance, the liquid phase CO2 concentration and the CO2 stripping efficiency of the membrane module and the effect of liquid phase temperature on CO2 stripping flux were studied. The experimental results showed that the stripping gas velocity had a minor effect on the CO2 desorption flux while the increase in the liquid velocity could enhance CO2 desorption flux in the gas stripping membrane contactor. By increasing liquid flow rate to 200ml/min, the maximum CO2 stripping efficiency of almost 66% was achieved. Enhancement of liquid flow rate from 50 to 200ml/min increased the CO2 flux around 482%. It was found that the CO2 stripping flux was significantly affected by the liquid phase temperature. By increasing liquid temperature from 80 to 90°C, the CO2 stripping flux increased from 1.3×10−4 to 4.9×10−4 molm−2 s−1 at liquid velocity of 200mlmin−1. Hence, the higher stripping efficiency can be achieved by applying the higher liquid flow rate in the membrane contactor module. As well, the liquid phase temperature is a key parameter that needs to be controlled. [Copyright &y& Elsevier]

Abstract: A novel surface modified Polysulfone (PSf) hollow fiber membrane was fabricated via dry–wet phased inversion process. surface modifying macromolecule (SMM) was used as additive in the spinning dope. The surface modified membrane showed large pore size, higher effective surface porosity, contact angle and porosity but lower critical water entry pressure (CEPw) compared to Polysulfone hollow fiber membrane without SMM. The performance of surface modified membrane in contactor application for CO2 absorption via distilled water as absorbent was studied. The results show that surface modified membrane has higher performance compared to plain Polysulfone membranes. With the membrane prepared from SMM in the spinning dope a maximum CO2 flux of 5.8×10−4 mol/m2 s was achieved at 300ml/min of absorbent flow rate, which was almost 76% more than the other membrane. In a long-term stability study, the initial flux reduction was found to be about 18% within the 50h of operation for surface modified membrane. [Copyright &y& Elsevier]

Abstract: Porous asymmetric polyetherimide (PEI) hollow fiber membranes were fabricated via a phase-inversion method using ethanol, glycerol and acetone as the additives in the spinning dope. Also, hollow fiber PEI membrane without additives was fabricated. An aqueous solution of 1-methyl-2-pyrrolidone (80wt.%) was used as bore fluid to prevent forming of an inner dense skin layer. The precipitation rate of the polymer dopes with the different additives was studied using cloud point measurement. The effect of the additives on the resulting membrane structure, surface porosity, pore size, critical water entry pressure, collapsing pressure and physical and chemical CO2 absorption performance by distilled water and NaOH (1M) solution in a gas–liquid membrane contactor system were investigated and compared. Cloud point diagrams indicated that the precipitation rate of the polymer dopes increased following the trend of ethanol>acetone>glycerol. Results of gas permeation tests showed that ethanol and glycerol as additives provided the membranes with the largest and smallest pore size, respectively. Moreover, all the additives resulted in an increase in the effective surface porosity. The cross-section of the membranes was examined via a scanning electron microscopy. Ethanol in the spinning dope provided the membrane structure with a sublayer with finger-like macrovoids, originating from the inner and outer surfaces of the hollow fiber and extending to the middle section of the hollow fiber wall, which resulted in a larger pore size and higher CO2 absorption rate than the other PEI hollow fiber membranes. [Copyright &y& Elsevier]

Abstract: The effect of bore fluid type on the structure and performance of polyetherimide hollow fiber membranes in contactor application was investigated. Water was used as phase inversion promoter in spinning dope and water and pure NMP were used as bore fluid. SEM micrographs show that the major parts of both membranes consist of spongelike structure which is related to the high viscosity of spinning dope that reduces the diffusion of coagulant (water) into membrane sublayer and decreases the rate of phase inversion. In the case of water as bore fluid (membrane #M1) there is skin layer on the inner surface of membrane and some drop-shaped voids in the structure of membrane but in the case of pure NMP as bore fluid (membrane #M2), the inner surface of membrane is skinless with big pores and there are fingerlike macrovoids, originating from the inner surface and extending to the vicinity of outer surface which is related to the penetration of bore fluid and dissolving the polymer. Furthermore, membrane #M2 has higher mean pore size and effective surface porosity. The absorption flux of both fabricated membranes was investigated in the case of liquid in lumen side (case #1) and liquid in shell side (case #2) where in case #1, membrane #M1 has higher absorption flux but in case #2, membrane #M2 has higher absorption flux. The different trend in absorption flux confirms that the surface of membrane in contact with the gas phase in a membrane contactor should be skinless with big pores to facilitates the diffusion of solute gas through membrane but the pore size on the surface of membrane in contact with the liquid phase should be adjusted to obtain high absorption flux and low wettability. [Copyright &y& Elsevier]

Abstract: High performance carbon hollow fiber membranes (CHFM) for CO2 separation were prepared by manipulating of carbonization heating rates under a N2 atmosphere. During heat treatment process, carbonization of the polymeric hollow fiber membrane was conducted up to 650°C and in the range of 1–9°C/min for heating rate. The gas permeation properties were determined using a single gas permeation apparatus at room temperature. Fine-tuning of the carbonization conditions appears necessary to obtain desired permeation properties. The gas permeance for all examined gases (N2, CH4, CO2) and selectivity of CO2/CH4 and CO2/N2 was decreased and increased, respectively, for the PEI/PVP-based CHFMs prepared at low heating rate. It was found that the heating rate posses significant effect on structure and gas permeation properties of the resultant CHFMs. Experimental results indicated that, carbonization heating rate of 3°C/min is the best conditions in the preparation of CHFMs derived from polymer blends of PEI/PVP for the CO2/CH4 and CO2/N2 separation. [Copyright &y& Elsevier]

Abstract: Porous asymmetric polysolfone (PSf) hollow fiber membranes were fabricated using wet spinning process. Glycerol (4wt.%) was used as additive. Aqueous solutions of 1-methyl-2-pyrrolidone (NMP) with different composition (0, 50, 70 and 90wt.% NMP) were used as bore fluid. Distilled water was used to preparing aqueous NMP solutions. Structure and performance of resulting membranes in measuring of surface porosity, pore size, critical water entry pressure (CEPw) and CO2 absorption in hollow fiber membrane contactor were investigated. The cross-section, the inner skin layer and the inner surface of the membranes were examined via scanning electronic microscopy (SEM). Using distilled water as bore fluid provided the membrane structure with a finger-like macrovoids which extend from the inner and outer surfaces of the membranes to the middle of the hollow fiber wall. Other hollow fiber membranes formed with a finger-like structure near the other surface and a sponge-like structure with holes beneath, which resulted in a high CEPw and CO2 absorption rate. In addition, since a mixture of distilled water and NMP was used as the neutral bore fluid, the membranes showed a skinless inner surface. Results of gas permeation tests showed with increasing NMP concentration in the bore fluid the N2 permeance decrease significantly and the wetting resistance decrease slightly. CO2 absorption by distilled water was conducted through the gas–liquid membrane contactors. By employing 90% NMP in the bore fluid, the PSf membrane showed a CO2 flux of approximately 110% higher than the PSf membrane fabricated with distilled water as the internal coagulant at the absorbent velocity of 7.9×10−4 m/s. [Copyright &y& Elsevier]

Abstract: Porous asymmetric polysulfone (PSf) hollow fiber membranes were fabricated via wet spinning process. A mixture of 1-methyl-2-pyrrolidone (NMP) and distilled water (90wt.% NMP) was used as bore fluid to make hollow fiber membranes without inner skin layers, whereas glycerol with 2 and 4wt.% was used as additives to the spinning dope. The effect of the additives concentration on the structure, surface porosity, pore size, critical water entry pressure (CEPw), and CO2 absorption flux of the fabricated membranes were investigated. The cross-section and inner surface of the membranes were examined via scanning electronic microscopy (SEM). Using glycerol as the additive in the spinning dope provided the membrane structure with a thin finger-like and a thick sponge-like layer, which resulted in a high CEPw and CO2 absorption rate. Results of gas permeation tests showed with increasing glycerol concentration the N2 permeance increase significantly and the wetting resistance decrease slightly. CO2 absorption by distilled water was conducted through the gas–liquid membrane contactors. By using 4% glycerol in the spinning dope, the PSf membrane showed a CO2 flux of approximately 57% higher than the PSf membrane with 2% glycerol at the absorbent flow rate of 200ml/min. [Copyright &y& Elsevier]

Abstract: This study investigated the use of nanosized fumed silica (Aerosil® R106) as fillers in the production of asymmetric hollow fiber mixed matrix membrane (HFMMM) where polysulfone was the host polymer matrix. The presence of fumed silica particles were found to stimulate the flow of CO2 as indicated by an increase (>12%) in CO2 permeability for all HFMMMs. At low loading of 0.1% (w/w), the permeability of CO2 and CH4 were 90.04 and 2.75GPU, respectively, and the calculated selectivity was higher than the neat PSf hollow fiber membrane. At higher loading of 10% (w/w), the FESEM images of the HFMMM showed severe agglomeration of fillers that contributed to nanometric defects between the aggregates, leading to higher permeation of slow gases (CH4 and N2). Hence, the selectivities of CO2/CH4 and O2/N2 were low at 7.43 and 2.02, respectively. The calculation of particle spacing within the polymer macromolecules have shown that for nanoparticles, the agglomeration was unavoidable at high loading due to sheer number of particles within the matrix. At low loading of 0.1%, the polysulfone-fumed silica HFMMM showed no visible sign of particle agglomeration. The selectivities of CO2/CH4 and O2/N2 significantly improved with an average value of 32.74 and 6.35, respectively. The HFMMM also showed an increase in glass transition temperature and has a better thermal stability as measured by DSC and TGA analyzers, respectively. The importance of filler–filler, polymer–filler and filler–gas interactions on the characteristic and permeation performance of HFMMMs are also discussed. [Copyright &y& Elsevier]

Abstract: Carbon hollow fiber membrane derived from polyetherimide (PEI) blend with polyvinylpyrrolidone (PVP) was prepared by pyrolysis under air and N2 environment. The characteristics of the carbon structures and the gas separation properties of carbon hollow fiber membranes pyrolyzed at different temperatures were studied. The prepared membranes were extensively characterized using thermogravimetry analysis, scanning electron microscopy, and X-ray diffraction for its morphology, thermal stability and structure properties, respectively. Pure gases of different molecular size (CO2, N2 and CH4) were used to determine the permeation properties of the carbon membrane. The permeance of the three gases decreased with increasing of pyrolysis temperature, however the selectivity of the gas pairs such as CO2/CH4 and CO2/N2 increased significantly. PEI/PVP is a promising carbon membrane precursor, which resulted in good separation performance for CO2/CH4 and CO2/N2. According to permeation data, it is confirm that the gas separation performance of prepared PEI/PVP-based carbon membranes significantly better than its polymer precursor. [Copyright &y& Elsevier]

Abstract: Removal of endocrine disrupting compound (viz., bisphenol A, BPA) by laboratory-fabricated hollow fiber polyethersulfone (PES) nanofiltration (NF) membranes have been investigated. The tailor made charged PES hollow fiber NF membranes have been developed by blending negatively charged surface modifying macromolecule (cSMM). It is resulted more than 90% removal of BPA, mainly due to negatively charged properties of the membrane and the negatively charged solute under the influence of higher pH feed water matrix. The PES hollow fiber modified by blending cSMM is associated with sulfonic groups, confirmed by energy dispersive X-ray and Fourier transform infrared analysis. The blending of cSMM has successfully modified PES hollow fiber which is resulted twice better removal of BPA compared to the unmodified PES. [Copyright &y& Elsevier]

• Membrane heat treatment is a simple method to improve MC stripping performance. • There was a direct correlation between the temperature and the performance. • The best performance was observed at the shortest heat exposure time. The scope of this study was to investigate the effect of the heat treatment process on the performance of the PEI hollow fiber membrane contactor for CO 2 stripping process. The membranes were fabricated via a wet spinning technique into water as a non-solvent bath. Then, the membranes were heat treated by exposing them to various temperatures of 80,120 and 160 °C for the time intervals of 5, 15 and 30 min under a hot air atmosphere. The observations revealed that the most pronounced enhancement belonged to the membranes with the lowest heat treatment temperature preferentially at the shorter exposure times. It was shown that the absorbent velocity and temperature had substantial influence on the CO 2 stripping flux, however the temperature exhibited a stronger influence. In fact the dual functionality of temperature on the system i.e. (i) thermodynamics (by decrease in CO 2 solubility) and (ii) kinetics (by increase in CO 2 diffusivity) led to the enhancement in CO 2 stripping flux. Also, it was revealed that by increasing the heat treatment temperature, more tendency toward the pore wetting will be observed. There was a meaningful correlation between the wetting ratio and the CO 2 stripping flux. Also experimentally it was revealed that, a marginal progress in the wetting ratio, surprisingly caused to a dramatic decline in the stripping flux. [ABSTRACT FROM AUTHOR]

Graphical abstract Highlights • A low cost kaolin was utilized in fabrication of ceramic hollow fibre membrane. • Surface modification with fluoralkylsilane agent was applied. • Modified membrane has a contact angle value of 145 and average pore size of 0.32 µm. • Excellent performance of 100% arsenic removal was achieved. Abstract In this work, a low cost hydrophobic kaolin hollow fiber membranes (h-KHFM) was successfully prepared by phase inversion/sintering technique followed by a modification via grafting with fluoroalkylsilane (FAS) molecules. The influence of sintering temperature varied from 1200 to 1500 °C on the hydrophobization and separation performance of kaolin hollow fiber membrane (KHFM) was investigated through direct contact membrane distillation (DCMD) system towards synthetic arsenic wastewater. The results reveal that h-KHFM prepared at a sintering temperature of 1300° °C induced a high contact angle value of 145°, an excellent LEPw value of 2 bar, and an average pore size of 0.32 µm. As a consequence, a high permeate flux of 28 kg/m2 h for As(III) and 25 kg/m2 h for As(V) with 100% arsenic rejection was obtained at a feed temperature of 60 °C and has met the required standard of maximum contaminant level (MCL) of 10 ppb. In addition, arsenic concentrations of up to 1000 ppm with various pH values of arsenic were also investigated using h-KHFM sintered at 1300 °C and there was no arsenic detected in the permeate. [ABSTRACT FROM AUTHOR]

Studies on mixed matrix membrane (MMM) have been sprouting rapidly since the last few decades, but mostly fabricated in the form of dense, flat films. In this work, hollow fiber Polysulfone (PSF)-Cloisite®15A (C15A) MMM were produced using our in-house hollow fiber spinning machine. Various spinning parameters are at play in order to ensure the formation of defect-free high performance hollow fiber. Spinning process parameters such as dry gap height, force convection rate, dope extrusion rate, and take-up speed have been systematically studied in order to identify the optimum fabrication conditions. Extensive characterizations on the membrane morphology, membrane surface properties, polymer d -spacing and gas separation performance were conducted using SEM, AFM, XRD, and pure gas permeation experiment. The appropriate balance between dry-gap residence time and force convective rate is essential to yield membrane with good permeability–selectivity combinations. CO 2 permeance was increased from 17.39 to 56.25 × 10 − 6 cm 3 (STP)/cm 2 s cmHg when the dope extrusion rate was increased from 1.5 cm 3 /min to the optimum extrusion rate of 2.5 cm 3 /min. Membranes spun at high collection speed (up to 35 m/min) exhibited practically attractive fiber geometry comparable to commercial hollow fibers (∼300 μm diameter) but the permeation properties were rather disappointing which might be caused by excessive deformation of polymer chain due to stretching. Hollow fiber MMM containing layered organoclay has exhibited excellent CO 2 /CH 4 pure gas selectivity of 40.26%, 46% higher than that of pristine hollow fiber fabricated under the same optimized conditions without compromising the CO 2 flux. The MMM was also found to be more thermally and mechanically robust in comparison to its neat counterpart. [ABSTRACT FROM AUTHOR]

Highlights: [•] AFM analysis on the PVDF hollow fiber membrane’s surface for CO2 stripping. [•] Increasing LiCl concentration has decreasing effect on membrane surface parameters. [•] Addition of LiCl has improved the overall membrane mass transfer coefficient. [Copyright &y& Elsevier]

In this work, green silica-based ceramic hollow fiber membranes (CHFMs) derived from rice husk ash waste were successfully prepared via phase inversion and sintering technique. Prior to the fabrication, rice husk waste was converted into amorphous and crystalline silica-based rice husk ash (ARHA and CRHA). The surface of CHFMs could be easily modified to become hydrophobic by grafting with a fluoroalkylsilane (FAS) agent. The CHFMs were characterized before and after grafting using scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), measurement of contact angle and liquid entry pressure of water (LEPw), and three-point bending test. The pore size and the porosity of the membrane surface were also evaluated using mercury intrusion porosimetry (MIP). Lotus-leaf structure formed at the surface of HFMs by grafting, leading to a high contact angle of >150°. Direct contact membrane distillation (DCMD) performance of membrane after grafting was conducted for 200 h using the synthetic seawater of various NaCl concentrations at different feed temperatures. The experimental results show that the permeate flux decreased with the increasing feed concentration, whereas it was enhanced with the increasing feed temperature. A high water flux of 38.2 kg/m 2 h and salt rejection up to 99.9% were obtained by CHFM prepared from CRHA (CHFM/CRHA). [ABSTRACT FROM AUTHOR]

• Increasing MPD and TMC concentrations enhance water vapor flux and membrane H 2 O/N 2 selectivity. • Increasing interfacial polymerization time controls the selectivity decline rate at high pressures. • Disregarding very low concentration of water vapor, it shows a great plasticizing impact on the gas permeance. • H 2 O-induced plasticization impact on nitrogen permeance is more intense than on water vapor. • Both the Henry and Langmuir models control the water adsorption while only the Henry controls N 2. Separation of moisture from gaseous mixtures, such as natural gas, humid air in food and goods storage warehouses or in sports halls and so on is of great importance. In this article, the separation of water from a wet gas stream is carried out by a TFC membrane made by interfacial polymerization on the sublayer of porous polyetherimide hollow fibers. Then the key-parameters affecting membrane efficiency is studied. The outcomes show that increasing the concentration of MPD has a substantial effect on enhancing the membrane water vapor flux. Moreover, it is disclose that increasing the concentration of TMC has the greatest effect on reducing nitrogen gas permeability and increasing the selectivity. Our findings reveals that disregarding the very low concentration of water vapor in the feed, shows a great impact on the permeance of each component compared to the pure state. Also, based on the modelling, it is obvious that for nitrogen gas in the entire pressure range, the adsorption mechanism is almost completely controlled by the Henry model, while the Langmuir adsorption mechanism is controlling for water vapor at low pressures, although at high pressures, the Henry mechanism has absolute superiority. Surprisingly, the H 2 O-induced plasticization impact on nitrogen permeance is more intense than on water vapor permeance. According to the modeling outputs, it is revealed that because D N2 is one to two order of magnitude lower than D H2O , water vapor permeance is much higher than that of nitrogen. [ABSTRACT FROM AUTHOR]

This study presents an alternative approach to improve the gas separation performance of conventional asymmetric membranes. For the first time, multicomponent composite/hybrid asymmetric membrane was prepared by unifying two prominent concepts in gas separation membranes: (1) sealing or caulking asymmetric membrane imperfections by means of coating a highly permeable polymer layer, and (2) the incorporation of selective inorganic particle in polymer matrix generally known as the mixed matrix membrane. Asymmetric hollow fiber membranes (polysulfone (PSF)) was externally coated by polydimethylsiloxane (PDMS) solution containing suspended Cu 3 (BTC) 2 metal organic framework (MOF) by dip-coating technique. FESEM–EDS mapping confirmed the increase in Cu 3 (BTC) 2 adherence with increasing number of coating. The pure gas permeation experiment with CO 2 , N 2 and CH 4 corroborated the contribution of Cu 3 (BTC) 2 particle to the overall composite/hybrid membrane performance. The gas permeation rates were increased with increasing number of PDMS–Cu 3 (BTC) 2 coating applied. CO 2 permeance increased from 69.7 to 109.2 × 10 −6 cm 3 (STP)/cm 2 s cmHg after 5 consecutive coatings. In addition, the CO 2 /CH 4 and CO 2 /N 2 selectivities were found to be increased as well. Cu 3 (BTC) 2 contributed to higher affinity toward CO 2 due to the coordinatively unsaturated copper sites in its crystal network, which provide exceptionally high adsorptive capability for polar molecules, hence resulted in the increase of the overall selectivities and gas permeation rates across the membrane. Further development based on this study will create vast opportunities for future improvement on any commercially available gas separation membranes by implementing the method described herein. [ABSTRACT FROM AUTHOR]

[Display omitted] • Boron doped TNT immobilized on the outer layer of a dual layered PVDF hollow fiber membrane. • A finger-like structure on both outer and inner layer, sandwiching a dense interlayer. • PVDF-L2% exhibited a maximum flux of 39.62L/m2h and colour removal of 79.42%. • Membrane recovered more than 95% of performance after 4 filtration cycles, exhibiting antifouling propensity. • Long term study confirms membrane usability over 20 days. The emergence of hybrid photocatalytic membranes has provided a new direction in search of efficient technologies to separate and degrade pollutants present in wastewaters. Colour pigments originated from different sources including agricultural waste pose serious threats towards water bodies as their presence will lead to multiple environmental problems. This study investigated the potential of a photocatalytic dual layered hollow fiber membrane (DLHFM) incorporated with boron doped titania nanotubes (TNT-B) photocatalyst for the photodegradation and removal of colour pigment molecules present in aerobically treated palm oil mill effluent (AT-POME). The colour removal efficiencies and separation performance of the DLHFM were evaluated through a submerged membrane photo reactor (SMPR) system driven by visible light. Polyvinylidene fluoride-based DLHFM loaded with 2% of photocatalyst (PVDF-L2%) exhibited the best membrane performance with a flux of 39.62 L/m2h and colour removal efficiency of 79.42%. The controlled distribution of photocatalysts as well as the synergistic combination of membrane filtration and photodegradation concertedly contributed to the improvement in membrane's performance. 95% of flux and colour removal efficiency were sustained after four filtration cycles. The membrane exhibited efficient performance in terms of consistent flux and colour removal efficiency after 20 days of continuous photocatalytic filtration, implying their high long-term stability. This study highlights the efficiency and potential of visible light photocatalytic membranes in treating colour laden wastewaters. [ABSTRACT FROM AUTHOR]

Highlights: [•] Recent progress in hollow fiber membrane preparation and new materials for making membranes. [•] Widely discussed recent progress of hollow fiber membranes characterization and application. [•] AFM images (internal and external surface of hollow fibre membranes and possible theories. [•] Recent progress of using hollow fiber membranes in contactor etc. [Copyright &y& Elsevier]

[Display omitted] • ZIF-8, SiO 2 /ZIF-8 and amine modified (A@SiO 2 /ZIF-8) nanofillers were synthesised. • Synthesised nanofillers incorporated polysulfone hollow fiber MMMs were fabricated. • Investigated the gas permeation and selectivity of MMMs for CO 2 , CH 4 and N 2 gases. • A@SiO 2 /ZIF-8 contributed 89 and 61% increase in CO 2 /N 2 and CO 2 /CH 4 selectivities. High tunable properties of metal–organic frameworks (MOFs) allows different modifications to be used for distinct applications. Zeolitic imidazolate frameworks-8 or ZIF-8 are hybrid organic–inorganic porous materials that have shown great potential in membrane-based gas separations. In our study, SiO 2 /ZIF-8 (S/ZIF-8) nanofiller was synthesized via a facile one-step strategy. Furthermore, the S/ZIF-8 nanofiller was subjected to amine modification using an ammonium hydroxide solution. X-ray photoelectron spectroscopy (XPS) analysis confirms the strong binding of amine and SiO 2 on ZIF-8 nanofillers. The synthesized ZIF-8, S/ZIF-8 , and amine-modified S/ZIF-8 (A@S/ZIF-8) of 0.5 wt% were incorporated into the polysulfone (PSf) matrix, and the hollow fiber mixed matrix membranes (MMMs) were fabricated using dry–wet phase inversion technique. The inclusion of an amine group in the S/ZIF-8 nanofillers enhances the interaction between the nanofillers and PSf matrices, thus improving the CO 2 /CH 4 and CO 2 /N 2 separation performances. The fabricated membranes were morphologically characterized by Scanning electron microscope (SEM), Brunauer–Emmett–Teller (BET) surface area, and the pore size distribution. It is noteworthy that the BET surface area was enhanced with nanofillers addition and significantly increased gas separation performance. The fabricated asymmetric hollow fiber MMMs were further studied for gas permeation experiments for CO 2 , N 2 , and CH 4. PSf with A@S/ZIF-8 MMMs showed the best performance as observed from the Robeson upper bound limit, CO 2 permeability of 4.25 barrer with the improvements in CO 2 /N 2 and CO 2 /CH 4 selectivities of 89.75 and 61.46% respectively, compared with neat PSf membrane. The enhanced permselectivity of PSf–A@S/ZIF-8 membranes is explained by CO 2 -facilitated transport, where the high CO 2 affinity of the amine group allows the selective transport of CO 2 rather than CH 4 and N 2. [ABSTRACT FROM AUTHOR]