表面改性
努森扩散
材料科学
膜
渗透
气体分离
石墨烯
化学工程
选择性
扩散
纳米技术
努森数
表面扩散
复合材料
吸附
化学
有机化学
多孔性
热力学
生物化学
物理
工程类
催化作用
作者
Aline Alencar Emerenciano,Rubens M. Nascimento,Ana Paula Cysne Barbosa,Ke Ran,Wilhelm Albert Meulenberg,Jesús González‐Julián
出处
期刊:Membranes
[MDPI AG]
日期:2022-10-21
卷期号:12 (10): 1025-1025
被引量:19
标识
DOI:10.3390/membranes12101025
摘要
Two-dimensional (2D) MXene materials have recently been the focus of membrane research due to their unique properties, such as their single-atomic-layer thickness, flexibility, molecular filtration abilities and microstructural similarities with graphene, which is currently the most efficient precursor material for gas separation applications. In addition, the potential to process nanoscale channels has motivated investigations of parameters which can improve membrane permeability and selectivity. Interlayer spacing and defects, which are still challenging to control, are among the most crucial parameters for membrane performance. Herein, the effect of heat treatment on the d-spacing of MXene nanosheets and the surface functionalization of nanolayers was shown regarding its impact on the gas diffusion mechanism. The distance of the layers was reduced by a factor of over 10 from 0.345 nm to 0.024 nm, the defects were reduced, and the surface functionalization was maintained upon treatment of the Ti3C2 membrane at 500 °C under an Ar/H2 atmosphere as compared to 80 °C under vacuum. This led to a change from Knudsen diffusion to molecular sieving, as demonstrated by single-gas permeation tests at room temperature. Overall, this work shows a simple and promising way to improve H2/CO2 selectivity via temperature treatment under a controlled atmosphere.
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