doi:10.1039/d3ta07109jengPérez-Miana, MartaLuque-Alled, José MiguelYahia, MohamedMayoral, ÁlvaroCoronas, JoaquínZIF-8 modified with 2-undecylimidazolate as filler for mixed matrix membranes for CO₂ separationART-2024-138540A novel modification of zeolitic imidazolate framework-8 (ZIF-8) with 2-undecylimidazolate (umIm) was explored to enhance its hydrophobic character and improve its compatibility with polymer of intrinsic microporosity PIM-1 when incorporated as a filler in mixed matrix membranes (MMMs). In addition to the study of the best conditions to exchange the structural ligand of ZIF-8 by umIm and the characterization (by FTIR, RMN, XRD, TGA, N2 adsorption and TEM) of the obtained material, comparative analyses were conducted using MMMs containing the original ZIF-8 and the modified version. Different loadings were applied to study the impact on gas separation properties. Remarkably, the MMM with the modified ZIF-8 demonstrated superior performance surpassing the Robeson upper bound line of 2008 and revealing the effectiveness of this MOF modification strategy. In fact, with the 10 wt% ZIF-8-umIm loading MMM, the highest value of CO2/N2 selectivity was 15.4 (12% higher than that of bare PIM-1) at a CO2 permeability of 16 667 Barrer (52% higher than that of bare PIM-1). These findings highlight the promising potential of the ZIF-8 modification with umIm as a valuable filler material for MMMs in gas separation applications.2024http://zaguan.unizar.es/record/13515910.1039/d3ta07109jhttp://zaguan.unizar.es/record/135159oai:zaguan.unizar.es:135159info:eu-repo/grantAgreement/ES/DGA/E13-23Rinfo:eu-repo/grantAgreement/ES/DGA/T68-23Rinfo:eu-repo/grantAgreement/ES/MCIN-AEI/PID2019-104009RB-I00-AEI-10.13039-501100011033info:eu-repo/grantAgreement/ES/MICINN/PID2022-138582OB-I00info:eu-repo/grantAgreement/ES/MICINN/RYC-2018-024561-Iinfo:eu-repo/grantAgreement/EUR/MICINN/TED2021-130621B-C41Journal of Materials Chemistry A 12, 17 (2024), 10316-10328by-nchttps://creativecommons.org/licenses/by-nc/4.0/deed.esinfo:eu-repo/semantics/openAccess