SCI和EI收录∣中国化工学会会刊

›› 2017, Vol. 25 ›› Issue (7): 882-891.DOI: 10.1016/j.cjche.2016.11.007

• Separation Science and Engineering • Previous Articles     Next Articles

Enhanced permeation performance of polyether-polyamide block copolymer membranes through incorporating ZIF-8 nanocrystals

Longwei Xu, Long Xiang, Chongqing Wang, Jian Yu, Lixiong Zhang, Yichang Pan   

  1. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 210009, China
  • Received:2016-10-12 Revised:2016-11-22 Online:2017-08-17 Published:2017-07-28
  • Supported by:
    Supported by the National Natural Science Foundation of China (21406106), Jiangsu Provincial NSFC (BK20130928), Foundation of Jiangsu Educational Committee of China (14KJB530006), the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), and the Research and Innovation Program for College Postgraduates of Jiangsu Province (Grant SJLX16_0300).

Enhanced permeation performance of polyether-polyamide block copolymer membranes through incorporating ZIF-8 nanocrystals

Longwei Xu, Long Xiang, Chongqing Wang, Jian Yu, Lixiong Zhang, Yichang Pan   

  1. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 210009, China
  • 通讯作者: Chongqing Wang,E-mail address:cqw@njtech.edu.cn;Yichang Pan,E-mail address:panyc@njtech.edu.cn
  • 基金资助:
    Supported by the National Natural Science Foundation of China (21406106), Jiangsu Provincial NSFC (BK20130928), Foundation of Jiangsu Educational Committee of China (14KJB530006), the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), and the Research and Innovation Program for College Postgraduates of Jiangsu Province (Grant SJLX16_0300).

Abstract: Membrane-based CO2 separation is a promising alternative in terms of energy and environmental issues to other conventional techniques. Polyether-polyamide block copolymer (Pebax) membranes are promising for CO2 separation because of their excellent selectivity, but limited by their moderate gas permeability. In this study, fresh-prepared zeolitic imidazolate framework-8 (ZIF-8) nanocrystals were integrated into the Pebax®1657 matrices to form mixed matrix membranes. The resulting membrane exhibits significantly improved CO2 permeability (as high as 300% increase), without the sacrifice of the selectivity, to the pristine polymer membrane. Several physical characterization techniques were employed to confirm the good interfacial interaction between ZIF-8 fillers and Pebax matrices. The effect of added ZIF-8 fillers on the transport mechanism through MMMs is also explored. Mixed-gas permeation for both CO2/N2 and CO2/CH4 was also evaluated. The separation performance for CO2/CH4 mixtures on the ZIF-8/Pebax MMMs is very close to the Roberson upper bound, and thus is technologically attractive for purification of natural gas.

Key words: Membrane, Separation, Carbon dioxide, Mixed matrix membrane, Metal-organic framework

摘要: Membrane-based CO2 separation is a promising alternative in terms of energy and environmental issues to other conventional techniques. Polyether-polyamide block copolymer (Pebax) membranes are promising for CO2 separation because of their excellent selectivity, but limited by their moderate gas permeability. In this study, fresh-prepared zeolitic imidazolate framework-8 (ZIF-8) nanocrystals were integrated into the Pebax®1657 matrices to form mixed matrix membranes. The resulting membrane exhibits significantly improved CO2 permeability (as high as 300% increase), without the sacrifice of the selectivity, to the pristine polymer membrane. Several physical characterization techniques were employed to confirm the good interfacial interaction between ZIF-8 fillers and Pebax matrices. The effect of added ZIF-8 fillers on the transport mechanism through MMMs is also explored. Mixed-gas permeation for both CO2/N2 and CO2/CH4 was also evaluated. The separation performance for CO2/CH4 mixtures on the ZIF-8/Pebax MMMs is very close to the Roberson upper bound, and thus is technologically attractive for purification of natural gas.

关键词: Membrane, Separation, Carbon dioxide, Mixed matrix membrane, Metal-organic framework