纳米孔
气体分离
石墨烯
膜
材料科学
化学工程
分离(统计)
纳米技术
化学
计算机科学
工程类
生物化学
机器学习
作者
Yong Wang,Qingyuan Yang,Chongli Zhong,Jian-Rong Li
标识
DOI:10.1016/j.apsusc.2017.02.253
摘要
Abstract Graphene has enormous potential as a membrane-separation material with ultrahigh permeability and selectivity. The understanding of mass-transport mechanism in graphene membranes is crucial for applications in gas separation field. We computationally investigated the capability and mechanisms of functionalized nanoporous graphene membranes for gas separation. The functionalized graphene membranes with appropriate pore size and geometry possess excellent high selectivity for separating CO 2 /N 2 , CO 2 /CH 4 and N 2 /CH 4 gas mixtures with a gas permeance of ∼10 3 –10 5 GPU, compared with ∼100 GPU for typical polymeric membranes. More important, we found that, for ultrathin graphene membranes, the gas separation performance has a great dependence not only with the energy barrier for gas getting into the pore of the graphene membranes, but also with the energy barrier for gas escaping from the pore to the other side of the membranes. The gas separation performance can be tuned by changing the two energy barriers, which can be realized by varying the chemical functional groups on the pore rim of the graphene. The novel mass-transport mechanism obtained in current study may provide a theoretical foundation for guiding the future design of graphene membranes with outstanding separation performance.
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