163708 20251030150826.0 doi 10.1016/j.seppur.2025.135596 sideral 145785 ART-2025-145785 eng Refaat, Dalia Universidad de Zaragoza Innovative starch-PVA membranes incorporating amino-functionalized Zeolitic Imidazolate frameworks for CO2/CH4 separation 2025 The growing need for efficient CO2 separation in natural gas purification and carbon capture has driven the advancement of high-performance membrane technologies. This study incorporates the zeolitic imidazolate framework ZIF-8-NH2 into blends of polysaccharide starch and polyvinyl alcohol (PVA) to fabricate eco-friendly membranes. These materials, prepared as dense mixed matrix membranes (MMMs) and thin-film nanocomposite (TFN) membranes, offer a sustainable solution for CO2/CH4 separation. The integration of ZIF-8-NH2 nanoparticles, recognized for their high crystallinity and surface area and selective adsorption capacity into the starch–PVA matrix (33/67 blend ratio), significantly enhances CO2 permeability, increasing from 124 to 188 Barrer at 10 wt% loading, while preserving high CO2/CH4 selectivity (14.1 for the pristine blend and 16.5 for the MMM). For TFNs, a 9/91 starch-PVA matrix with 15 wt% ZIF-8-NH2 incorporated into the selective layer resulted in the best conditions. This architecture provided robust mechanical stability and high separation performance, yielding a CO2 permeance of up to 208 GPU and a CO2/CH4 selectivity of 26.9 at 3 bar feed pressure, nearly doubling the selectivity compared to the dense biopolymer blend. This work highlights the potential of renewable, starch-based materials in membrane-based gas separation, contributing to sustainable solutions for natural gas purification and carbon capture. Access copy available to the general public Unrestricted info:eu-repo/grantAgreement/ES/AEI/RYC2022-0381393-I info:eu-repo/grantAgreement/ES/DGA/T68-23R info:eu-repo/grantAgreement/ES/MICINN/PID2022-138582OB-I00 info:eu-repo/grantAgreement/EUR/MICINN/TED2021-130621B-C4 info:eu-repo/grantAgreement/ES/MICIU/CEX2023-001286-S info:eu-repo/semantics/openAccess by-nc-nd https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Amenakpor, Jacking Coronas, Joaquín Universidad de Zaragoza (orcid)0000-0003-1512-4500 Zornoza, Beatriz Universidad de Zaragoza (orcid)0000-0002-9934-1707 5005 555 Universidad de Zaragoza Dpto. Ing.Quím.Tecnol.Med.Amb. Área Ingeniería Química 382, Part. 1 (2025), 135596 [14 pp.] Sep. Purif. Technol. Separation and Purification Technology 1383-5866 6671196 http://zaguan.unizar.es/record/163708/files/texto_completo.pdf Versión publicada 2765063 http://zaguan.unizar.es/record/163708/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:163708 articulos driver 2025-10-30-14:39:24 ARTICLE