Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Gas Permeation Characteristics of PEBAX-PEI Composite Membranes Containing ZIF-8@GO

ZIF-8@GO를 함유한 PEBAX-PEI 복합막의 기체투과 특성

  • Yi, Eun Sun (Department of Chemical Engineering and Materials Science, Sangmyung University) ;
  • Hong, Se Ryeong (Kyedang College of General Educations, Sangmyung University)
  • 이은선 (상명대학교 화공신소재학과) ;
  • 홍세령 (상명대학교 계당교양교육원)
  • Received : 2021.05.24
  • Accepted : 2021.06.21
  • Published : 2021.08.10
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Abstract

In this study, PEBAX/GO-PEI and PEBAX/ZIF-8@GO-PEI composite membranes were prepared by varying the contents of GO and ZIF-8@GO in PEBAX, and also the gas permeation characteristics of N2 and CO2 was studied. Overall, the N2 and CO2 permeability of the PEBAX/GO-PEI composite membrane decreased as the GO content increased, and the CO2/N2 selectivity slightly increased. In the case of PEBAX/ZIF-8@GO-PEI composite membrane, the permeability of N2 decreased, but CO2 increased to 1 wt% of ZIF-8@GO and then decreased in the content thereafter. The CO2/N2 selectivity at 1 wt% of ZIF-8@GO was 92.3, showing the highest selectivity. This is thought to be due to the greatest effect of GO and ZIF-8 with good affinity for CO2 alongside the effect of porosity ZIF-8 while improving compatibility with PEBAX and dispersing evenly. In addition, PEBAX/ZIF-8@GO-PEI composite membrane improved both CO2 permeability and CO2/N2 selectivity than those of the PEBAX-PEI and PEBAX/GO-PEI membranes, except for ZIF-8@GO 5 wt%. The result was close to the Robeson upper bound.

본 연구에서는 PEBAX에 GO과 ZIF-8@GO의 함량을 달리하여 PEBAX/GO-PEI 복합막과 PEBAX/ZIF-8@GO-PEI 복합막을 제조하고, N2와 CO2의 투과 특성을 연구하였다. 전체적으로 PEBAX/GO-PEI 복합막의 N2와 CO2 투과도는 GO 함량이 증가할수록 감소하였고, CO2/N2 선택도는 약간 증가하였다. PEBAX/ZIF-8@GO-PEI 복합막에서도 N2의 투과도는 감소하였으나 CO2는 ZIF-8@GO 1 wt%까지 증가하였고, 그 이후의 함량에서는 감소하였다. CO2/N2 선택도는 ZIF-8@GO 1 wt%에서 92.3으로 가장 높은 선택도를 보였는데 이는 PEBAX와의 호환성을 향상시켜 고르게 분산되면서 다공성의 ZIF-8의 효과와 함께 CO2에 친화성이 좋은 GO, ZIF-8의 효과를 가장 크게 받았기 때문으로 생각된다. 또한 PEBAX/ZIF-8@GO-PEI 복합막은 ZIF-8@GO 5 wt%를 제외하고 PEBAX-PEI와 PEBAX/GO-PEI 복합막보다 CO2 투과도와 CO2/N2 선택도가 모두 향상되면서 Robeson upper bound에 근접하는 결과를 얻었다.

Keywords

Acknowledgement

이 논문은 상명대학교 2021년도 교내연구비 지원에 의해 수행되었으며 이에 감사드립니다.

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