膜
巴勒
选择性
聚合物
沼气
化学工程
材料科学
渗透
合成膜
气体分离
纳米-
金属有机骨架
渗透
沸石咪唑盐骨架
纳米技术
吸附
沸石
微型多孔材料
甲烷
化学
有机化学
复合材料
废物管理
催化作用
工程类
生物化学
作者
Chumei Ye,Xingyu Wu,Hong Wu,Long Yang,Yanxiong Ren,Yingzhen Wu,Yutao Liu,Zheyuan Guo,Rui Zhao,Zhongyi Jiang
标识
DOI:10.1016/j.ces.2020.115497
摘要
Membrane-based separations are of energy-efficient and environmentally benign attributes for biogas energy developments. Membranes from polymers of intrinsic microporosity (PIMs) often suffer from low selectivity. In this study, remarkable enhancements in CO2/CH4 selectivity of PIM-1 membranes are achieved by incorporating nano-sized ZIF-67 (ZIF-S) filler with a larger specific surface area and a better compatibility, thereby fortifying the interactions with PIM-1 matrix and effectively alleviating nonselective interfacial voids. For the resulting PIM-1/ZIF-S membranes, a maximum CO2/CH4 selectivity of 21.1 was acquired with 15 wt% loading of ZIF-S, an increase of 69.40% compared with the pristine PIM-1 membrane, along with an associated CO2 permeability above 2800 Barrer. To elucidate gas transport behaviors within membranes, a modified Maxwell model is developed and the calculation results match well with the experimental data. The strategy of incorporating framework nanofillers into membranes may find promising applications in enhancing the selectivity of highly permeable polymer membranes.
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