New CO2 separation membranes containing gas-selective Cu-MOFs

Sang Young Lim, Jiyoung Choi, Ha Yeong Kim, Youngmee Kim, Sung Jin Kim, Yong Soo Kang, Jongok Won

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

We examined the challenge of preparing CO2-selective bifunctional three-dimensional Cu-metal-organic frameworks (Cu-MOFs) for use in mixed-matrix membranes (MMMs) fabricated on an asymmetric polymer support. Two different gas-selective micro-sized frameworks, [{Cu2(Glu)2(μ-bpa)}·(CH3CN)]n (Cu-MOF1) and [{Cu2(Glu)2(μ-bpp)}·(C3H6O)]n (Cu-MOF2) (Glu=glutarate, bpa=1,2-bis(4-pyridyl)ethane, bpp=1,3-bis(4-pyridyl)propane), were synthesised and dispersed in polyoxazoline (POZ), as a matrix for the fabrication of the MMMs. SEM imaging indicated relatively good adhesion between the Cu-MOFs and POZ, without any surface treatment. The ideal selectivity of CO2/N2 was enhanced significantly in the Cu-MOF/POZ MMM, compared to that in a pristine POZ asymmetric membrane. Improvement in the CO2/N2 selectivity of the membranes was achieved via both high adsorption selectivity of CO2 over N2 by the Cu-MOFs, and the difference in pore sizes. The fabrication methods that use gas-selective MOFs may create new opportunities for gas-selective MOF/polymer combinations for MMMs with useful properties for large volume separations.

Original languageEnglish
Pages (from-to)67-72
Number of pages6
JournalJournal of Membrane Science
Volume467
DOIs
StatePublished - 1 Oct 2014

Bibliographical note

Funding Information:
This work was supported by the Korea Center for Artificial Photosynthesis (KCAP) , funded by the Ministry of Education, Republic of Korea through the National Research Foundation of Korea ( No. 2012M1A2A2671781 ). The authors also acknowledge the Energy Efficiency & Resources Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant financial resource from the Ministry of Trade, Industry and Energy , Republic of Korea (No. 20130389 ).

Keywords

  • Metal-organic framework
  • Mixed-matrix membranes
  • Polyoxazoline

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