멤브레인 (Membrane Journal)

  • 제30권6호
  • /
  • Pages.409-419
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  • 2020
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  • 1226-0088(pISSN)
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  • 2288-7253(eISSN)
한국막학회 (The Membrane Society of Korea)
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PEBAX/ZIF-8과 PEBAX/amineZIF-8 복합막을 통한 CO2와 N2의 기체투과 특성

Gas Permeation Characteristics of CO2 and N2 through PEBAX/ZIF-8 and PEBAX/amineZIF-8 Composite Membranes

  • 홍세령 (상명대학교 계당교양교육원) ;
  • 오소영 (상명대학교 화공신소재학과) ;
  • 이현경 (상명대학교 화공신소재학과)
  • Hong, Se Ryeong (Kyedang College of General Educations, Sangmyung University) ;
  • O, So Young (Department of Chemical Engineering and Materials Science, Sangmyung University) ;
  • Lee, Hyun Kyung (Department of Chemical Engineering and Materials Science, Sangmyung University)
  • 투고 : 2020.10.07
  • 심사 : 2020.11.24
  • 발행 : 2020.12.31
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초록

본 연구에서는 ZIF-8와 amine으로 개질된 ZIF-8 (amineZIF-8) 함량에 따른 PEBAX/ZIF-8, PEBAX/amineZIF-8 복합막을 제조하고, 각 복합막에 대해 N2와 CO2의 기체투과 성질을 조사하였다. N2와 CO2 투과도는 PEBAX/ZIF-8 복합막의 경우 ZIF-8 함량이 많아질수록 증가하였고, PEBAX/amineZIF-8 복합막의 경우 amineZIF-8 20 wt%까지 증가하다가 그 이상의 함량에서는 감소하였다. CO2/N2 이상 선택도는 PEBAX/ZIF-8과 PEBAX/amineZIF-8 복합막 모두 ZIF-8과 amineZIF-8의 함량 20 wt%까지는 증가하다가 그 이후 감소하였고, PEBAX/amineZIF-8 복합막의 경우는 감소폭이 적었다. AmineZIF-8 20 wt%에서 CO2/N2 이상 선택도가 가장 높았던 이유는 amine 개질로 PEBAX와 amineZIF-8 사이에서의 호환성을 높이고, amineZIF-8이 PEBAX 내에 고르게 분산되면서 3.4 Å 기공 크기를 갖고 있는 ZIF-8 효과와 CO2에 친화성이 있는 amine의 효과를 가장 크게 받았기 때문으로 보인다.

In this study, PEBAX/ZIF-8 and PEBAX/amineZIF-8 composite membranes were prepared according to the content of zeolitic imidazolate framework-8 (ZIF-8), amine-modified ZIF-8 (amineZIF-8), the gas permeability properties of N2 and CO2 were investigated for each composite membrane. In the case of the PEBAX/ZIF-8 composite membrane, the permeability of N2 and CO2 increased as the ZIF-8 content increased, and in the case of the PEBAX/amineZIF-8 composite membrane, the permeability of N2 and CO2 increased up to 20 wt% of amineZIF-8, but decreased at the higher content. CO2/N2 ideal selectivity increased up to 20 wt% of ZIF-8 and amineZIF-8 contents in both PEBAX/ZIF-8 and PEBAX/ amineZIF-8 composite membranes, and then decreased thereafter, in the case of PEBAX/amineZIF-8 composite membrane was less decreased. The reason for the highest CO2/N2 ideal selectivity at 20 wt% of amineZIF-8 is that amine modification improved the compatibility between PEBAX and amineZIF-8, and thus amineZIF-8 was evenly dispersed in PEBAX, resulting in the greatest effect of the porous ZIF-8 with a 3.4 Å pore size and the amine with affinity for CO2.

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