期刊
JOURNAL OF MEMBRANE SCIENCE
卷 602, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.memsci.2020.117946
关键词
Pebax; Few-layer graphene; Mixed-matrix membranes; N-doped; CO2 capture
资金
- Advanced Research Center of Green Materials Science and Technology from the Featured Area Research Center Program [108L9006, 109L891102]
- Ministry of Science and Technology in Taiwan [MOST 107-3113-E-002-009, 107-2221-E-002-101-MY3, 108-2218-E-002-036, 108-3017-F-002-002, 109-3116-F-006 -018]
In this study, an environmentally friendly method was developed to fabricate N-doped few-layer graphene (N-FLG)/Pebax mixed-matrix membranes (MMMs) for CO2 capture. A supermixer was introduced to ensure homogeneity of the N-FLG in the Pebax solution, and a highly efficient method of N-FLG/Pebax MMM preparation was achieved. The membrane structures were analyzed by SEM, while the N-FLG morphology was examined by SEM, AFM, XPS and EDX. A detailed molecular simulation was applied to mimic and predict the behavior of and interaction between membranes and gas molecules. Through the simulation, an independent analysis of transport-related characteristics, such as diffusivity, solubility and permeability, was achieved. In addition, the simulation indicated that the affinity of N-FLG for CO2 molecules improves the CO2 capture performance, that the membranes are solubility-dependent when prepared with low contents of N-FLG and that the effect of diffusivity increases as the addition of N-GO increases above 5 wt%. The simulation results were highly correlated with the experimental results, while the experimental gas permeability results showed that the optimal performance of N-FLG/Pebax MMM was obtained with the addition of 4 wt% N-FLG, providing CO2 permeability and CO2/N-2 selectivity of 239.8 Barrer and 95.5, respectively. Pebax-1657-based MMMs incorporating N-FLG nanosheets fabricated by an environmentally friendly method can therefore be considered a promising material for CO2 capture applications.
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