Back to Search
Start Over
Fluorine-functionalized 2D covalent organic frameworks with kgd topology for efficient C2H2/CO2 separation.
- Source :
- New Journal of Chemistry; 4/14/2023, Vol. 47 Issue 14, p6759-6764, 6p
- Publication Year :
- 2023
-
Abstract
- The effective separation of C<subscript>2</subscript>H<subscript>2</subscript>/CO<subscript>2</subscript> is important for the purification of acetylene. However, because of their highly similar physical properties, separating them efficiently is challenging. Due to the special physical and chemical properties of fluorine, fluorine-containing frameworks have potential applications in gas separation. Here, two isoreticular two-dimensional covalent organic frameworks with kgd topology, defined as TFT-COF and TMT-COF, were designed and constructed via the [6+3] imine condensation reaction. Experimental studies show that the IAST selectivity of a fluorine-functionalized TFT-COF for C<subscript>2</subscript>H<subscript>2</subscript>/CO<subscript>2</subscript> separation is 4.18, which is higher than that of the fluorine-free counterpart of 2.72, at 298 K and 1 bar. GCMC simulation indicates that the improved selectivity of the TFT-COF for C<subscript>2</subscript>H<subscript>2</subscript>/CO<subscript>2</subscript> separation arises from the strong electronegativity of fluorine groups and the resulting increased polarity of the pore surface, leading to enhanced C⋯H interactions between C<subscript>2</subscript>H<subscript>2</subscript> and the skeleton. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 11440546
- Volume :
- 47
- Issue :
- 14
- Database :
- Complementary Index
- Journal :
- New Journal of Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 162899379
- Full Text :
- https://doi.org/10.1039/d3nj00045a