[논문]ZIF-8GO를 함유한 PEBAX-PEI 복합막의 기체투과 특성

이은선; 홍세령

doi:10.14478/ace.2021.1049

ZIF-8GO를 함유한 PEBAX-PEI 복합막의 기체투과 특성
Gas Permeation Characteristics of PEBAX-PEI Composite Membranes Containing ZIF-8GO 원문보기

공업화학 = Applied chemistry for engineering, v.32 no.4, 2021년, pp.431 - 441

이은선 (상명대학교 화공신소재학과) , 홍세령 (상명대학교 계당교양교육원)

초록
AI-Helper

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.

Abstract ▼ AI-Helper

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.

주제어

표/그림 (12)

그림 Figure 1. (a) Photograph of a composite membrane created on the water surface, (b) SEM image of cross section of PEBAX/ZIF-8@GO-PEI, and (c) the schematic diagram of the manufacturing procedure of composite membrane.
그림 Figure 2. Composite membrane photograph: (a) PEBAX-PEI, (b) PEBAX/ZIF-8@GO 1 wt%-PEI, and (c) PEBAX/ZIF-8@GO 5 wt%-PEI.
그림 Figure 3. FT-IR spectra of ZIF-8, GO, and ZIF-8@GO.
그림 Figure 4. FT-IR spectra of PEBAX/GO and PEBAX/ZIF-8@GO.
그림 Figure 5. XRD spectra of GO, ZIF-8, and ZIF-8@GO.
그림 Figure 6. TGA curves of PEBAX/GO and PEBAX/ZIF-8@GO.
그림 Figure 7. Permeance of (a) PEBAX/GO-PEI and (b) PEBAX/ZIF-8@GO-PEI composite membranes according to the particle content.
그림 Figure 8. Diffusivity of permeation gases in PEBAX/GO-PEI and PEBAX/ZIF-8@GO-PEI composite membranes.
그림 Figure 9. Solubility of permeation gases in PEBAX/GO-PEI and PEBAX/ZIF-8@GO-PEI composite membranes.
그림 Figure 10. Selectivity of PEBAX/GO-PEI and PEBAX/ZIF-8@GO-PEI composite membranes according to the particle content.
그림 Figure 11. Diffusivity selectivity and solubility selectivity of PEBAX/GO-PEI and PEBAX/ZIF-8@GO-PEI composite membranes according to the particle content.
그림 Figure 12. Ideal selectivity vs CO2 permeability in PEBAX/GO-PEI and PEBAX/ZIF-8@GO-PEI composite membranes according to the particle content.

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