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The Membrane Society of Korea (한국막학회)
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Gas Permeation Characteristics of Membrane Using Poly(ether-b-amide)/ZIF-7

Poly(ether-b-amide)/ZIF-7을 이용한 막의 기체투과 특성

  • Yoon, Soong Seok (Department of Chemical Engineering and Materials Science, Sangmyung University) ;
  • Hong, Se Ryeong (Kyedang College of General Educations, Sangmyung University)
  • 윤숭석 (상명대학교 화공신소재학과) ;
  • 홍세령 (상명대학교 계당교양교육원)
  • Received : 2021.05.03
  • Accepted : 2021.05.24
  • Published : 2021.06.30
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Abstract

In this study, mixed matrix membranes were prepared by mixing the synthesized zeolitic imidazolate framework-7 (ZIF-7) with poly(ether-b-amide) 2533 (PEBAX2533). A single gas (N2, CO2) was permeated through the membrane to investigate the properties of the gas. Through FT-IR, XRD, and FE-SEM, the peaks and shapes of ZIF-7 were confirmed, and it was determined that the synthesis was successful. Through TGA, it was confirmed that ZIF-7 has excellent thermal stability and that when incorporated into the membrane, the thermal stability is improved compared to pure PEBAX2533. It was found that ZIF-7 synthesized through BET had excellent CO2 adsorption capacity and CO2/N2 adsorption selectivity showed a high value of about 49.64. For the gas permeation, as the ZIF-7 content in the mixed membrane increases, the N2 permeability decreases and the CO2 permeability slightly decreases, while the CO2/N2 selectivity steadily increases. In particular, when 20 wt% of ZIF-7 was added, the CO2 permeability did not decrease significantly and the CO2/N2 selectivity increased considerably, resulting in the performance approaching to the Robeson upper-bound.

본 연구는 합성된 zeolitic imidazolate framework-7 (ZIF-7)을 poly(ether-b-amide) 2533 (PEBAX2533)에 혼합하여 혼합막을 제조하고, 단일기체(N2, CO2)를 투과하여 기체에 대한 성질을 조사하였다. FT-IR, XRD, FE-SEM을 통해 ZIF-7이 가지는 피크와 형상을 확인하였고, 합성이 잘 되었음을 판단하였다. TGA를 통해 ZIF-7이 우수한 열적 안정성을 가지는 것과 막 내에 혼입되었을 때 순수 PEBAX2533에 비해 열적 안정성이 향상되는 것을 확인하였다. BET를 통해 합성된 ZIF-7의 CO2 흡착 능력이 우수하고 CO2/N2 흡착 선택도가 약 49.64로 높은 편이라는 것을 확인하였다. 기체 투과는 혼합막에서 ZIF-7 함량이 증가함에 따라 N2 투과도는 감소하고 CO2 투과도는 비교적 적게 감소하면서 CO2/N2 선택도는 꾸준히 증가하는 모습을 보였다. 특히 ZIF-7 20 wt%이 첨가되었을 때 CO2 투과도가 크게 감소하지 않고 선택도가 상당히 증가하여 Robeson upper-bound에 근접하는 결과를 얻었다.

Keywords

Acknowledgement

이 논문은 상명대학교 2020년도 교내연구비 지원에 의해 수행되었으며 이에 감사드립니다.

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