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The Membrane Society of Korea (한국막학회)
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Highly-permeable SBS/UiO-66 Mixed Matrix Membranes for CO2/N2 Separation

CO2/N2 분리를 위한 SBS/UiO-66 기반의 고투과성 혼합 매질 분리막

  • Kim, Young Jun (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Moon, Seung Jae (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Kim, Jong Hak (Department of Chemical and Biomolecular Engineering, Yonsei University)
  • 김영준 (연세대학교 화공생명공학과) ;
  • 문승재 (연세대학교 화공생명공학과) ;
  • 김종학 (연세대학교 화공생명공학과)
  • Received : 2020.09.29
  • Accepted : 2020.10.19
  • Published : 2020.10.31
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Abstract

In this study, we developed mixed matrix membranes by blending thermoplastic elastomer, i.e. polystyreneblock-polybutadiene-block-polystyrene (SBS) block copolymer with the synthesized UiO-66 particles for CO2/N2 gas separation. To investigate the effect of UiO-66 particles in the SBS matrix, we prepared different mixed matrix membranes (MMMs) by varying the mass ratio of SBS and UiO-66 in the blend. To fabricate well-dispersed UiO-66, the SBS/UiO-66 mixture was sonicated and stirred thoroughly. The physico-chemical properties of prepared membranes were characterized by Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscope (SEM). The gas separation performance was measured by time-lag method. The permeability of the MMMs increased significantly as the content of UiO-66 increased, but the CO2/N2 selectivity did not decrease significantly. The membranes containing 20% of UiO-66 particles showed the best performance with the CO2 permeability and CO2/N2 selectivity of 663.8 barrer and 13.3, respectively. This result showed performance closer to upper bound than pure SBS membrane in the Robeson plot, as the added UiO-66 particles did not significantly sacrifice selectivity and more than doubled gas permeability.

본 논문에서는 UiO-66 입자를 합성하고, 이를 열가소성 탄성중합체인 polystyrene-block-polybutadiene-block-polystyrene (SBS) 블록공중합체 매질에 삽입하는 방식으로 CO2/N2 기체를 분리하기 위한 혼합 매질 분리막을 제조하였다. UiO-66가 고분자 매질에서 미치는 영향을 확인하기 위해 SBS와 UiO-66의 질량 비율을 변화시켜가며 혼합 매질 분리막을 제조하였다. 또한 UiO-66 입자의 균일한 분산을 위해서 두 차례에 걸친 초음파 처리 및 자성 막대를 이용한 물리적 혼합을 활용하였다. 제조된 시료들은 푸리에 변환 적외분광법(FT-IR), 주사전자현미경(SEM)을 통해 확인하였다. 또한 기체 투과 성능은 time-lag method를 통해 확인하였다. 이때, UiO-66의 함유량이 증가함에 따라 혼합 매질 분리막의 투과도는 크게 증가하였지만, CO2/N2 선택도는 크게 감소하지 않았다. 가장 좋은 성능을 보인 20%의 UiO-66 입자를 함유한 분리막의 경우 663.8 barrer의 CO2 투과도와 13.3의 CO2/N2 선택도를 보여주었다. 이러한 결과는 Robeson plot에서 순수 고분자 막에 비해 upper bound에 더 가까운 성능을 나타냈는데, 첨가된 UiO-66가 선택도를 크게 희생시키지 않고 기체 투과도는 두 배 이상 향상시켰기 때문이다.

Keywords

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