Min, Su Bin Kang, Miso Jeon, Yoon-Jae Kim, Eun-Young Kim, Jong Hak Kim, Jeong-Hoon 2025-08-20T05:32:50Z 2025-08-20T05:32:50Z 2025-08-20 2025-09 2050-7488 https://pubs.kist.re.kr/handle/201004/152975 Developing high-performance membranes for post-combustion CO2 separation is essential in addressing the ongoing climate crisis. In this study, we fabricated a series of composite mixed-matrix membranes (MMMs) featuring ultrathin 100 nm-thick films, incorporating UiO-66 nanocrystals with three distinct functional groups (-H, -Br, -NO2) as fillers, a poly(glycidyl methacrylate-co-poly(oxyethylene methacrylate)) (PGO) polymer matrix, and poly[1-(trimethylsilyl-1-propyne)] (PTMSP)-coated polysulfone supports. The incorporation of functionalized UiO-66 fillers significantly enhanced the CO2 permeance and CO2/N2 and CO2/CH4 selectivities of the ultrathin-film-coated MMMs, owing to improved CO2 solubility and diffusivity. Notably, PGO/UiO-66-NO2 MMMs exhibited superior CO2 separation performance compared to PGO/UiO-66 and PGO/UiO-66-Br MMMs. This enhancement is attributed to the exceptionally high CO2 adsorption capacity of UiO-66-NO2, along with its excellent interfacial compatibility with the PGO polymer matrix. The optimal CO2 separation performance was achieved with the UiO-66-NO2 MMM at 20% particle loading, yielding a CO2 permeance of 1816 GPU and CO2/N2 and CO2/CH4 selectivities of 37 and 14, respectively. These findings highlight the excellent CO2/N2 and CO2/CH4 separation efficiency of UiO-66-based MMMs, underscoring their potential as promising candidates for CO2 capture in post-combustion processes from fossil fuels and biogas. Moreover, this study emphasizes the critical role of optimizing polymer-metal-organic framework (MOF) combinations by considering both the CO2 uptake capacity of the filler and the interfacial compatibility between the polymer and MOF. English Royal Society of Chemistry Rational design of ultrathin, functionalized UiO-66 mixed-matrix membranes for CO2 separation: balancing CO2 uptake and interfacial compatibility Article 10.1039/d5ta01957e 1 Journal of Materials Chemistry A, v.13, no.33, pp.27356 - 27366 Journal of Materials Chemistry A 13 33 27356 27366 N scie scopus 001532403400001 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Chemistry Energy & Fuels Materials Science Article FABRICATION CAPTURE COMPOSITE MEMBRANES RECENT PROGRESS PERFORMANCE