膜
材料科学
选择性
化学工程
复合数
气体分离
天然橡胶
纳米技术
渗透
复合材料
化学
有机化学
工程类
渗透
生物化学
催化作用
作者
Kun Yang,Sulei Hu,Yujie Ban,Yingwu Zhou,Na Cao,Meng Zhao,Yifei Xiao,Wei‐Xue Li,Weishen Yang
标识
DOI:10.1016/j.scib.2021.05.006
摘要
Metal-organic framework (MOF) membranes hold great promise in energy-efficient chemical separations. The outstanding challenges of the microstructural design stem from (1) thinning of membranes to immensely reduce the mass-transfer resistance (for high permeances); (2) tuning of orientation to optimize the selective transport of gas molecules, and (3) reinforcement of intercrystalline structure to subside leakage through defective gaps (for high selectivity). Here, we propose the ZIF-L membrane that is completely confined into the voids of the alumina support through an interfacial assembly process, producing an appealing membrane-interlocked-support (MIS) composite architecture that meets the requirements of the microstructural design of MOF membranes. Consequently, the membranes show average H2 permeances of above 4000 GPU and H2/CO2 separation factor (SF) of above 200, representing record-high separation performances of ZIF-L membranes and falling into the industrial target zone (H2 permeance > 1000 GPU and H2/CO2 SF > 60). Furthermore, the ZIF-L membrane possessing the MIS composite architecture that is established with alumina particles as scaffolds shows mechanical stability, scraped repeatedly by a piece of silicon rubber causing no selectivity loss.
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