Cellulose Acetate Membrane Research Articles

Synthesis of high-performance biocompatible polymeric membranes incorporated with zirconium-based MOF for an enhanced brackish water RO desalination

A nanosized zirconium 1,4- dicarboxybenzene metal-organic framework (UiO-66-MOF) was synthesized and impregnated into cellulose acetate (CA) polymeric matrix to enhance the membrane characteristics for brackish water desalination. Phase inversion was used for the fabrication of CA/UiO-66 hybrid membranes (CAU-X), where X is the concentration of immobilized UiO-66 nanoparticles (UiO-66-NPs) into CA polymeric matrix. Morphological structure and functional groups were investigated through different characterization techniques to prove the successful synthesis of the prepared UiO-66-NPs, the blank CA membrane, and hybrid CAU-X membranes. For more CAU-X characteristics, porosity, contact angle, and tensile strength were measured. The obtained data demonstrated that the impregnation of zirconium-based-NPs had a positive influence on the blank CA membrane properties. Additionally, the performance of the fabricated membranes was investigated in reverse osmosis (RO) bench-scale unit. The performance results for the pristine CAU-0 membrane showed a high salt rejection (SR) of 99.8% and a permeate water flux (PWF) of 1.14 L/m2.h. In comparison to pristine CA membrane, CAU-X hybrid membranes have a slightly lower SR and a higher PWF. It was found that the hybrid CAU-0.02 membrane had almost a doubled PWF of 2.8 L/m2.h with only 2% sacrificed SR of 97.6% compared with CAU-0 membrane. Moreover, a much better PWF of 3.4 L/m2h and a sufficient SR of approximetly 92% were obtained by CAU-0.05 membrane. Thus, CAU-0.05 was selected to further test its performance under different operating parameters. Results revealed that the optimum parameters were recorded for a sodium chloride feed stock of 5000 ppm operating at 25 °C temperature and pressure up to 15 bar.Graphical

Remediation of contaminated water using cellulose acetate membrane hybrid by sunflower seed shell–activated carbon

AbstractIn this study, newly created hybrid cellulose acetate (CA) membranes were prepared using the phase inversion technique. Activated carbon derived from Helianthus annuus (sunflower) seed shells (SFAC) were immersed in CA polymer casting solution, and the produced membranes were used to treat contaminated water. Phosphoric acid was utilized as an activating agent with a ratio of 3:1 (wt.) for preparing SFAC7, SFAC8, and SFAC9 activated carbons with various carbonization temperatures (700, 800, and 900°C, respectively). By using SEM, TEM, XRD, BET, and FTIR, the SFAC and CA membranes were characterized. The SFAC9 sample has the highest surface area SBET (786.62 m2/g), total pore volume VT (0.7694 mL/g), and pore radius r– (4.0026 nm). The effects of various starting concentrations (5–20 mg/L), SFAC dose (0.1–0.5), pH (2–12), and contact time (0.5–24 h) conditions were investigated. The outcomes showed that the CA (SFAC9 0.1%) membrane performed better than other membranes in removing crystal violet (CV) dye, with an 84.67% removal rate under ideal environmental circumstances. The dye decolorization onto the CA (SFAC9 0.1%) membrane was fitted with various adsorption isotherms using the Langmuir > Tempkin > Freundlich model. Additionally, the kinetics studies showed pseudo-second-order, which suggests that chemisorption occurred.

Covalent immobilization of human serum albumin on cellulose acetate membrane for scavenging amyloid beta – A stepping extracorporeal strategy for ameliorating Alzheimer’s disease

Alzheimer’s disease (AD) is a neurodegenerative disorder characterized by interrupted neurocognitive functions and impaired mental development presumably caused by the accumulation of amyloid beta (Aβ) in the form of plaques. Targeting Aβ has been considered a promising approach for treating AD. In the current study, human serum albumin (HSA), a natural Aβ binder, is covalently immobilized onto the surface of a cellulose acetate (CA) membrane to devise an extracorporeal Aβ sequester. The immobilization of HSA at 3.06 ± 0.22 μg/mm2 of the CA membrane was found to be active functionally, as evidenced by the esterase-like activity converting p-nitrophenyl acetate into p-nitrophenol. The green fluorescent protein–Aβ (GFP–Aβ) fusion protein, recombinantly produced as a model ligand, exhibited characteristics of native Aβ. These features include the propensity to form aggregates or fibrils and an affinity for HSA with a dissociation constant (KD) of 0.91 μM. The HSA on the CA membrane showed concentration-dependent sequestration of GFP–Aβ in the 1–10-μM range. Moreover, it had a greater binding capacity than HSA immobilized on a commercial amine-binding plate. Results suggest that the covalent immobilization of HSA on the CA surface can be used as a potential platform for sequestering Aβ to alleviate AD.

Evaluation of lupeol-chitosan nanoparticles infused cellulose acetate membranes for enhanced in-vitro anticancer and antidiabetic activities

This study utilizes the abundance of pharmacologically active compounds found in natural products and concentrates on the promising anticancer agent lupeol (LUP). The limited water solubility and bioavailability of lupeol have limited its therapeutic utility. To test their potential for treating diabetes and cancer, we synthesized lupeol@chitosan (LUP@CS) nanoparticles encapsulated in cellulose acetate (CA) membranes (LUP@CS/CA). Extensive characterization, including Scanning electron microscopy, Thermogravimetric analysis, X-ray photoelectron spectroscopy, and mechanical strength analysis, confirmed the membrane's structural integrity and drug release capacity. Notably, in vitro experiments utilizing A431 human skin cancer cells revealed remarkable anticancer activity, positioning the membrane as a potential novel therapeutic agent for the treatment of skin cancer. Inhibiting carbohydrate-digesting enzymes effectively, as evidenced by IC50 values as low as 54.56 mg/mL, the membrane also exhibited significant antidiabetic potential. These results demonstrate the multifarious potential of the membrane, which offers promise for both the treatment of skin cancer and the management of diabetes, and has significant implications for nano biological applications.

Sustainable wastewater management in the brewing industry: Utilizing cellulose acetate membranes derived from brewers’ spent grain for enhanced treatment efficiency

Brewers’ spent grain (BSG), the primary by-product of the brewing industry, constitutes approximately 85.0% of the total by-products generated. BSG is known for its rich cellulose and non-cellulosic polysaccharide content, making it a valuable resource with significant potential for profitable recycling and reutilization. Given that the brewing sector is among the most substantial industrial consumers of water due to the water-intensive process of producing BSG, the effective management of wastewater in this industry is of paramount importance. This research focuses on investigating innovative wastewater management in the brewing sector. It employs the conversion of BSGs into a cellulose acetate membrane, thus enabling a physio-chemical treatment process utilizing the micro-filtration technique for wastewater treatment within the brewery industry. The results of this study demonstrate a substantial reduction in biochemical oxygen demand from the initial value of 16.65 mg/l (untreated) to 13.70 mg/l, 11.16 mg/l, 8.37 mg/l, 5.58 mg/l, and 3.14 mg/l after the first through fifth treatment cycles, respectively. Furthermore, the research indicates a high correlation with an R<sup>2 </sup>value of 0.999, affirming the viability and effectiveness of the treatment process. This is further substantiated by the results of chemical oxygen demand, total dissolved solids, total suspended solids, and hydrogen ion concentration analyses presented in this study. These findings not only validate the efficacy of utilizing BSG-derived cellulose acetate membranes but also emphasize the potential for revolutionizing wastewater treatment practices within the brewing industry. This research paves the way for sustainable, environmentally conscious strategies in industrial wastewater management, ensuring the optimal utilization of by-products while minimizing the environmental footprint of brewing operations.

Desalination of seawater using integrated microbial biofilm/cellulose acetate membrane and silver NPs/activated carbon nanocomposite in a continuous mode

The main objective of the present study was to desalinate seawater using Bacillus cereus gravel biofilm and cellulose acetate (CA) membranes with and without silver nanoparticles (AgNPs) as a potent and safe disinfectant for the treated water. Six desalination trials (I, II, III, IV, V and VI) were performed using the proposed biofilm/cellulose membrane. Results confirmed that Bacillus cereus gravel biofilm (microbial desalination) is the optimal system for desalination of seawater. It could achieve 45.0% RE (initial salinity: 44,478 mg/L), after only 3 h compared to the other tested treatments. It could also achieve 42, 42, 57, 43 and 59% RE for TDS, EC, TSS, COD and BOD, respectively. To overcome the problem of the residual salinity and reach complete elimination of salt content for potential reuse, multiple units of the proposed biofilm can be used in sequence. As a general conclusion, the Bacillus cereus biofilm system can be considered as remarkably efficient, feasible, rapid, clean, renewable, durable, environmentally friendly and easily applied technology compared to the very costly and complicated common desalination technologies. Up to our knowledge, this is the first time microbial biofilm was developed and used as an effective system for seawater desalination.

A review on recent advances of cellulose acetate membranes for gas separation.

This review thoroughly investigates the wide-ranging applications of cellulose-based materials, with a particular focus on their utility in gas separation processes. By focusing on cellulose acetate (CA), the review underscores its cost-effectiveness, robust mechanical attributes, and noteworthy CO2 solubility, positioning it as a frontrunner among polymeric gas separation membranes. The synthesis techniques for CA membranes are meticulously examined, and the discourse extends to polymeric blend membranes, underscoring their distinct advantages in gas separation applications. The exploration of advancements in CA-based mixed matrix membranes, particularly the incorporation of nanomaterials, sheds light on the significant versatility and potential improvements offered by composite materials. Fabrication techniques demonstrate exceptional gas separation performance, with selectivity values reaching up to 70.9 for CO2/CH4 and 84.1 for CO2/N2. CA/PEG (polyethylene glycol) and CA/MOF (metal-organic frameworks) demonstrated exceptional selectivity in composite membranes with favorable permeability, surpassing other composite CA membranes. Their selectivity with good permeability lies well above all the synthesised cellulose. As challenges in experimental scale separation emerge, the review seamlessly transitions to molecular simulations, emphasizing their crucial role in understanding molecular interactions and overcoming scalability issues. The significance of the review lies in addressing environmental concerns, optimizing membrane compositions, understanding molecular interactions, and bridging knowledge gaps, offering guidance for the sustainable evolution of CA-based materials in gas separation technologies.

Green Chemistry of Cellulose Acetate Membrane Plasticized by Citric Acid and Succinonitrile for Lithium-Ion Battery Application

Green Chemistry of Cellulose Acetate Membrane Plasticized by Citric Acid and Succinonitrile for Lithium-Ion Battery Application

Utilization of green resource-based Mimosa pudica hydrogel powder in a cellulose acetate-based polymeric membrane as absorbent: a sustainable approach towards female hygiene application

This research explores the potential of incorporating Mimosa pudica hydrogel powder into a modified cellulose acetate membrane, enhancing its properties as an absorbent material for female hygiene applications.

Enhanced Dye Adsorption and Bacterial Removal of Magnetic Nanoparticle-Functionalized Bacterial Cellulose Acetate Membranes

Enhanced Dye Adsorption and Bacterial Removal of Magnetic Nanoparticle-Functionalized Bacterial Cellulose Acetate Membranes

Sickle Cell Gene Frequency Analysis in Visapur, District Chandrapur: A Case Study of Single Village from Central India

Sickle cell anemia burden is generally studied by calculating how many sickle cell carriers are found in specific diagnostic camps based on combination of screening test and confirmatory tests i.e. sickle cell carrier prevalence method. Where as actual total numbers of alleles can be estimated by combining data of how many carriers and homozygous patients are found in the confirmatory testing camps, which is a gene frequency calculation method. Aim of this study is to compare prevalence and gene frequency calculations for one village data, for study conducted in year 2005 at Visapur village, Chandrapur district, Central India. Sampling was done in village school followed by screening and confirmatory testing at field work laboratory at Ballarpur city which included solubility test, hemoglobin estimation, hemoglobin electrophoresis using cellulose acetate membrane method followed by pedigree analysis after parent studies. This is a sickle cell anaemia study of single village data point. Out of total population of the village, 6.68% population were randomly studied. Total registrations done for 755 individuals and out of that total 628 individuals were tested (N = 628, 293 were females and 335 were males) for solubility tests followed by haemoglobin electrophoresis. For socioeconomically disadvantages groups, it was noted that out of 628 individuals, tribals were 111 and non-tribals, 517. Out of total tested, N=628, SCD homozygous status were found in 7 cases (Hb S+S electrophoresis pattern). In 87 cases sickle cell carrier status (Hb A+S electrophoresis pattern) were observed and in remaining 534 individuals, non-sickle cell status observed i.e. Hb A+A electrophoresis pattern. Based on this sickle cell prevalence observed for total tribal and non-tribal is 13.85% After classifying tribal Vs non-tribal population, 7 homozygous patients were found in non-tribal communities, 5 in Schedule caste, 1 in OBC and 1 in open category, there is no SCD patient found in tribal community. Out of 50 sickle cell carriers, 7 were found from tribal community and remaining all 80 belongs to non-tribal community. Out of which, 49 are from scheduled cast and 31 from OBC community. After studying sickle cell prevalence and gene frequency pattern, it is found that gene frequency gives more accurate status of sickle cell anaemia even in small population size, i.e. independent study of single village, as compared to estimation sickle cell anemia using sickle cell carrier prevalence method.

ENHANCED MECHANICAL AND THERMAL PROPERTIES OF ELECTROSPUN CELLULOSE ACETATE FIBER MEMBRANES INCORPORATING PAHAE NATURAL ZEOLITE

In recent decades, fiber membranes have garnered significant attention and found numerous applications across various fields. This work used the electrospinning method to create fiber membranes with cellulose acetate (CA) as a primary polymer material. The characteristics of the fiber membrane, such as mechanical and thermal properties, were investigated by incorporating Pahae Natural Zeolite (PNZ) microparticles into the CA matrix. The fiber membranes' mechanical properties are improved by adding PNZ to the CA matrix, and the CA/PNZ 10% exhibits the maximum tensile strength of 0.97 MPa and elongation at a break of 4.52%. Meanwhile, incorporating PNZ filler into CA fiber membranes significantly enhances their thermal stability. This improvement is attributed to the formation of hydrogen bonds between CA and PNZ, as evidenced by the increasing residue values with higher PNZ content. Specifically, the residue of pure CA membrane fiber is 13.46%, which increases to 44.06% for CA/PNZ 15% fiber membranes. These favorable thermal and mechanical properties of the fiber membranes indicate the promising potential of CA/PNZ based membranes for filtration applications.

Synergistic antimicrobial nanofiber membranes based on metal incorporated silica nanoparticles as advanced antimicrobial layers.

In this post-new-normal era, the public prioritizes preventive measures over curing, which is a constructive approach to staying healthy. In this study, an innovative antimicrobial membrane material has been developed, showcasing the promising potential for various applications. The metal-doped silica nanoparticles (Ag, Cu, and Co) were incorporated into a cellulose acetate (CA) polymer-based nanofiber membrane using the electrospinning technique. The metal nanoparticles were doped into a silanol network of silica nanoparticles. The fabricated membranes underwent detailed characterization using a wide range of techniques including PXRD, FTIR, Raman, SEM, TEM, TGA, and tensile testing. These analyses provided compelling evidence confirming the successful incorporation of metal-doped silica nanoparticles (Ag, Cu, and Co) into cellulose-based nanofibers. The band gap energies of the fabricated CA mats lie below 3.00 eV, confirming that they are visible light active. The trimetallic silica nanohybrid exhibited the lowest band gap energy of 2.84 eV, proving the self-sterilizing ability of the CA mats. The DPPH assay further confirmed the best radical scavenging activity by the trimetallic silica nanohybrid incorporated nanofiber mat (91.77 ± 0.88%). The antimicrobial activity was assessed by using the bacterial ATCC strains of Staphylococcus aureus, Streptococcus pneumoniae, MRSA (Methicillin-resistant Staphylococcus aureus), Escherichia coli, Klebsiella pneumoniae, and Pseudomonas aeruginosa and fungal strains; quality control samples of Trichophyton rubrum, Microsporum gypsium, and Aspergillus niger, as well as the ATCC strain of Candida albicans. The trimetallic silica nanohybrid-incorporated CA membranes demonstrated the most significant inhibition zones. The reported findings substantiate the self-sterilizing mat's viability, affordability, efficacy against a broad spectrum of microbial strains, cost-effectiveness, and biodegradability. Furthermore, the mat serves as a dual-purpose physical and biological barrier against microbes, affirming its potential impact.

Removal of a cyanotoxins mixture by loose nanofiltration membranes applied in drinking water production

Cyanobacterial toxins may threaten human health if their levels in drinking water exceed certain thresholds. Therefore, it is important for water works that use raw water sources prone to cyanobacterial blooms to have efficient barriers against such toxins. Nanofiltration (NF) is one potential barrier. The efficacy and mechanism of removing four cyanotoxins, namely microcystins (MCs), cylindrospermopsin (CYN), saxitoxins (STXs), and anatoxin (ATX), were studied at bench-scale using NF membranes commonly applied in Norwegian drinking water facilities. The average removal of the different cyanotoxins under the tested operating conditions ranged from 15 % to 96 %. The membrane with the lowest molecular weight cut-off (MWCO) of 0.3 kDa made of polyamide (PA) was deemed the most suitable for the removal of all studied cyanotoxins. A gradual improvement of rejection observed with the 2 kDa cellulose acetate (CA) membrane was linked to the formation of fouling on the membrane surface. Sulfonated polyethersulfone (SPES) membranes with MWCO of 1 and 3 kDa could not efficiently and consistently remove cyanotoxins, except for MCs. The rejection of MCs over time was over 80 % by the SPES membranes during two days of filtration. The influence of pressure and pH as relevant operating parameters was evaluated. However, the analysis of the cyanotoxin concentrations in the permeate indicated that the investigated NF membranes alone would generally not be able to meet the WHO guidelines for drinking water during a severe cyanobacterial bloom. Thus, incorporating other water treatment technologies should be considered to effectively remove cyanotoxins.

Synthesis and Characterization of Cellulose Acetate Membrane from Corn (<i>Zea mays</i>) Husk as Lithium-Ion Battery Electrolyte Membrane

Rechargeable lithium-ion batteries (LIBs) have gained popularity and the attention of numerous researchers in recent times because of their benefits. The separator membrane is one of the most important parts of the LIB. Separator membranes are made of polymeric materials, one of which is cellulose acetate (CA). In this study, we synthesize CA from corn husk. There are 2 methodological ways in this study, namely the synthesis of CA which consists of delignification and acetylation, and fabrication of PVDF/ CA/ Nanoclay electrolyte membrane with variation of CA PVDF (0%:100, 10%: 90%, 20%: 80%, 30%: 70%, 50%: 50%). The synthesis of CA from corn husk exhibits XRD results which were comparable to the peak of commercial CA. Meanwhile, the PVDF/ CA-Nanoclay-based separator membrane with the composition of 50% PVDF and 50% CA had the best characterization results with an electrolyte uptake value of 139.649% and a porosity value of 79.11%. Based on the attained results, the CA extracted from corn husk in this study is applicable to use for the fabrication of electrolyte membrane.

Waste cellulose acetate-based dynamic membrane for NOM-containing river water filtration

Excessive leaching of natural organic matter (NOM) from swamp forests into water resources poses significant challenges for water treatment plants, primarily due to its high variability. In this study, a waste-based cellulose acetate (W-CA) membrane was explored as a dynamic membrane for the filtration of real river water containing NOM and compared to a commercial-based CA (C-CA) membrane. The membranes were fabricated and thoroughly characterized. The results revealed that the W-CA membrane exhibited greater hydrophilicity, as indicated by a static contact angle of 84°, compared to the hydrophobic nature of the C-CA membrane (104°). The mean pore diameters of the C-CA and W-CA membranes were 4.4 µm and 5.3 µm, respectively, suitable as the base for a dynamic filter. The formation of a dynamic cake filtration layer (identified mainly as humic and fulvic acids) was confirmed from visual observation, SEM image and the decrease in the pore sizes. It was further validated from the cake layer as the dominant fouling mechanism obtained from a curve fitting analysis. Despite the W-CA and C-CA membranes respectively showed a high steady-state river water permeabilities of 348 and 226 L/(m2 h bar) respectively, they were still unable to fully remove NOM (27% removal for W-CA and 39% removal for C-CA membrane), suggesting the necessity for further developments. This study underscores the potential of W-CA membranes for water treatment while promoting a circular economy by converting waste into valuable resources and sustainable products.

Green Synthesis of Citric Acid-Crosslinked Cellulose Acetate Membrane for Polymer Electrolyte

Safer alternative for lithium-ion battery containing liquid electrolyte was proposed using solid polymer electrolyte as a combo separator/electrolyte. In this work, cellulose acetate (CA) was used to replace fossil-based polymer as battery separator. To further promote sustainable membrane fabrication, dimethylsulfoxide (DMSO) and citric acid was used as solvent and cross-linking agent, respectively. Branched polyethyleneimine (bPEI) was also incorporated in the polymer electrolyte complex to promote electrolyte salt dissociation within the matrix. Crosslinking of CA-bPEI using citric acid showed promising properties compared to unmodified CA membrane. Better thermal stability and lower crystallinity were seen in the modified CA membrane, resulting in better ionic conductivity.

Design of sulfonated polystyrene grafted cellulose acetate membrane for direct methanol fuel cells

Novel low-temperature proton conducting membranes are fabricated from commercial and low-cost cellulose acetate (CA). Rather than a normal modification procedure, sodium 4-styrene sulfonate groups (SSA) are grafted into cellulose acetate chains through a facile one-step free radical polymerization. The resulting CA@P(SSA) membranes with different monomer concentrations were characterized using advanced and relevant techniques such as FT-IR, TGA, and SEM. The grafting of side-chain groups was adjusted to maximise the physicochemical features of the fabricated membranes, such as ion exchange capacity, water and methanol absorption, and conductivity. By considering these features the optimized membrane (Corresponding to 1.5 wt% SSA) exhibits excellent thermal-oxidative stability and tensile strength (22.742 N) better than Nafion® 212 (16.153 N). In addition, the grafted membrane demonstrated lower methanol permeability (5.514×10−7cm2/s)andenhanced ionic conductivity (4.77×10−3S/cm) with membrane selectivity of 8.65×103S.s/cm3 with peak power density (24.6 mW/cm2). In addition, the optimized membrane showed increase in performance than pristine CA membrane. Thus, these results provide new, straightforward, high-performance and low-cost polyelectrolyte membrane with a significant potential for direct methanol fuel cell.

Filter no more: A modified plankton sampler for rapid in‐water eDNA capture

Abstract The combination of an efficient sampling method and high‐throughput analysis of environmental DNA (eDNA) can be a powerful approach for characterising biodiversity across aquatic ecosystems. Plankton net tows are one of the oldest, simplest, and least expensive methods for seston and eDNA collection, but require laborious filtration steps which often lead to clogging and/or the introduction of contaminants. In this study, we used a cruising speed net (CSN) device enabling the collection of seston‐derived eDNA at 5 knots speed combined with a novel modified cod‐end with 20 μm nylon mesh inserts enabling eDNA capture while towing. We compared the performance of the CSN sampling protocol with the original conventional filtration of water sample versus the modified cod‐end. Samples were collected in parallel horizontal tows along New Zealand's North‐Eastern coastline. Concentrated water was filtered on conventional 5 μm cellulose acetate membranes, while the 20 μm nylon mesh inserts were immediately isolated post‐towing. Metabarcoding of bacterial 16S rRNA, eukaryotic nuclear 18S rRNA and mitochondrial COI genes, revealed no significant difference in alpha diversity between filtration techniques. In terms of community composition, a clear and significant shift could be observed between sampling sites and environments. Significant differences could be detected between filtration methods for 16S and COI markers, likely driven by fine‐scale differences at more turbid sheltered sites. Nonetheless, each technique could detect shifts in communities between sites and environments with similar sensitivity. Our results demonstrate the promising potential of the modified cod‐end to enable practical and cost‐effective isolation of eDNA‐derived biodiversity data from any vessel types (at ≤5 knots) across a large range of aquatic ecosystems and biogeographic scales.

Preparation, characterization, and CO2 permeation testing of cellulose acetate and polyimide blend membranes

AbstractMembrane‐based CO2 separation is vital for various applications such as biogas upgradation. Polymer membranes are employed for CO2 separation in the industry. Polymer membranes have a trade‐off between selectivity and permeability. Blending polymers is an emerging approach for altering the gas transport in the membranes. This work investigates the fabrication and characterization of blended biodegradable cellulose acetate (CA) with polyimide (PI). Thermal stability was characterized using thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC), and functional groups were analyzed using Fourier transform infrared spectroscopy (FTIR). The morphology of membranes is analyzed using field‐emission scanning electron microscope (FESEM). The blend membranes were tested for separation of CO2 from model biogas (CO2/CH4) at room temperature and a low feed pressure (∼1.5 bar). The CA:PI blend membrane composed of 93% CA and 7% PI showed CO2 permeability of 19.71 Barrer, approximately 206% greater than pure CA, and CO2/CH4 selectivity was 9.42. Experimental results are compared with literature on CA‐based membranes.Highlights Blend membrane of cellulose acetate (CA) and polyimide (PI) CO2/CH4 gas permeation testing of membranes using a model biogas mixture Blend membranes exhibit 206% higher CO2 permeability than pure CA membranes Blend membranes demonstrated enhanced CO2/CH4 selectivity of 9.42.