화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.38, No.5, 1032-1042, May, 2021
DOI10.1007/s11814-021-0762-z  Export Citation
Fabrication of hydrophobic ZIFs based composite membrane with high CO2 absorption performance
Li Xu, Yu Qin, Liying Liu, Juntian Xiao, and Zhongwei Ding†
  • Beijing Key Laboratory of Membrane Science and Technology, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
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The membrane contactor has been considered an effective device to capture CO2, but its performance is limited by membrane wetting phenomena. In this work, the ZIF-8/ZIF-L (zeolitic imidazolate framework) based composite membrane with excellent hydrophobic stability and CO2 permeability was successfully fabricated by coating the dense layer on the porous PVDF (polyvinylidene fluoride) substrate. The dense layer was developed by evenly incorporating ZIF-8 nanocrystals and ZIF-L nanosheets into the polydimethylsiloxane (PDMS) polymer. The as-prepared membrane possessed competitive hydrophobicity with a water contact angle (WCA) of 131.8o. And after a ten-day immersion test in CO2 absorbent, the WCA only declined by 9.8%, exhibiting excellent hydrophobic stability. Besides, the CO2 permeability of the composite membrane was 61.8 X10-8ㆍmolㆍm-2ㆍs-1ㆍPa-1 with an ideal CO2/N2 separation factor of ~20, which was effectively improved in comparison with the control membrane. In the CO2 absorption experiment, the prepared membrane achieved the competitive CO2 flux of 3.02X10-3ㆍmolㆍm-2ㆍs-1 when the liquid velocity was 0.25mㆍs-1 and displayed robust long-term operating stability. Finally, the AC impedance technique was applied to continuously monitor the wetting state of composite membranes, which further investigated their anti-wetting ability.
Keywords:Hydrophobic Composite Membrane;Zeolitic Imidazolate Frameworks (ZIFs);CO2 Absorption;Membrane Wetting;Membrane Contactor
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