Abstract
Chromatographic monitoring of chlorofluorocarbons in air requires the preconcentration of these highly volatile species. In this paper, we present functionalized multiwalled carbon nanotubes as effective sorbents for amicrotrap designed for chlorofluorocarbons preconcentration. Among the commercial carbons and carbon nanotubes studied, functionalization via carboxylation and propyl amine was most effective for dichlorofluoromethane and trichlorofluoromethane (Freon 11), which were selected as representative chlorofluorocarbons. The results show that carbon nanotubes functionalized with a polar groups led to as much as a 300% increase in breakthrough volume and the desorption bandwidth was reduced by 2.5 times.
Original language | English (US) |
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Pages (from-to) | 426-432 |
Number of pages | 7 |
Journal | Journal of Separation Science |
Volume | 38 |
Issue number | 3 |
DOIs | |
State | Published - Feb 1 2015 |
All Science Journal Classification (ASJC) codes
- Analytical Chemistry
- Filtration and Separation
Keywords
- Breakthrough volume
- Carbon nanotubes
- Chlorofluorocarbons
- Preconcentration
- Surface functionalization