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The Membrane Society of Korea (한국막학회)
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Gas Permeation Characteristics of PEBAX Mixed Matrix Membranes Containing Polyethylenimine-modified GO

Polyethylenimine으로 개질된 GO를 함유한 PEBAX 혼합막의 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 : 2021.11.15
  • Accepted : 2021.11.30
  • Published : 2021.12.31
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Abstract

In this study, a mixed matrix membrane was prepared by varying the contents of GO and PEI-GO synthesized in PEBAX2533, and the permeation characteristics of N2 and CO2 were studied. The N2 and CO2 permeability of the PEBAX/GO mixed membrane decreased as the GO content increased, and showed the highest CO2/N2 selectivity of 58.9 at GO 0.3 wt%. For the PEBAX/PEI-GO mixed membrane, the N2 permeability decreased as the PEI-GO content increased, and the CO2 permeability showed a different trend according to the PEI-GO content. Overall, the CO2/N2 selectivity was higher than that of the PEBAX/GO mixed membrane. In particular, PEI-GO 0.3 wt% showed the highest CO2/N2 selectivity of 73.5 among the mixed membranes, and a positive result was obtained as it was located above the Robeson upper bound. This is believed to be due to the molecular sieving channel effect resulting from the original GO structure, the functional groups present in the structure of GO having affinity for CO2, and the effect of amine bound to PEI by modifying GO into PEI.

본 연구에서는 PEBAX2533에 합성된 GO와 PEI-GO의 함량을 달리 첨가하여 혼합막을 제조하고 N2와 CO2의 투과 특성을 연구하였다. PEBAX/GO 혼합막의 N2와 CO2 투과도는 전체적으로 GO 함량이 증가할수록 감소하였고, GO 0.3 wt%에서 가장 높은 CO2/N2 선택도 58.9를 보였다. 그리고 PEBAX/PEI-GO 혼합막에서 N2 투과도는 PEI-GO 함량이 증가함에 따라 감소하였고, CO2 투과도는 PEI-GO 함량에 따라 다른 경향을 보였으며 전체적으로 PEBAX/GO 혼합막보다 더 높은 CO2/N2 선택도를 보였다. 특히 PEI-GO 0.3 wt%는 혼합막들 중 가장 높은 CO2/N2 선택도인 73.5를 보이며 Robeson upper bound 위에 위치하는 긍정적인 결과를 얻었다. 이는 본연의 GO 구조에 의한 molecular sieving channel 효과와 CO2에 친화성이 있는 GO의 구조 내에 존재하는 작용기 그리고 GO를 PEI로 개질함으로써 PEI에 결합되어 있는 amine에 의한 효과가 함께 작용했기 때문으로 생각된다.

Keywords

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