Submicron-thick, mixed-matrix membranes with metal-organic frameworks for CO2 separation: MIL-140C vs. UiO-67

Miso Kang, Tea Hoon Kim, Hyug Hee Han, Hyo Jun Min, Youn Sang Bae, Jong Hak Kim

Research output: Contribution to journalArticlepeer-review


High-performance thin-film mixed-matrix membranes (MMMs) were prepared using two types of zirconium-based metal-organic frameworks (MOFs), MIL-140C and UiO-67; both were dispersed in a polymer matrix for CO2 separation. A poly(glycidyl methacrylate-co-poly(oxyethylene methacrylate) (PGO) copolymer was synthesized via one-pot free-radical polymerization and used as an adhesive matrix to allow intimate interfacial contact with the MOF fillers, resulting in 600 nm-thick defect-free MMMs with uniform dispersion. Both fillers comprise the same building blocks but have different pore sizes, structures, and particle morphologies. The pores of UiO-67 are 3D cage-like with a polyhedral morphology and were larger than the 1D channel-like pores of MIL-140C, having a rod-like morphology. The use of two fillers led to different degrees of polymer infiltration into the MOF pores, resulting in different CO2 separation performances. Overall, the MMMs with MIL-140C showed greater CO2/N2 and CO2/CH4 selectivities than those with UiO-67 because of the well-defined micropores resulting from mild polymer infiltration and structural advantages such as a high aspect ratio. The best separation performance was achieved at 20% of MIL-140C loading (CO2 permeance of 1768 GPU and CO2/N2 selectivity of 38), lying in the commercial criteria required for post-combustion CO2 capture.

Original languageEnglish
Article number120788
JournalJournal of Membrane Science
Publication statusPublished - 2022 Oct 5

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (Nos. 2020R1A5A1019131 , 2020K1A4A7A02095371 , and 2021M3H4A1A03049662 ). This work benefited from the use of the SasView application, originally developed under the NSF Award DMR - 0520547. SasView also contains code developed with funding from the EU Horizon 2020 program under the SINE2020 project Grant No 654000 .

Publisher Copyright:
© 2022 Elsevier B.V.

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation


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