Comparison of Adsorbents Containing Carbon Nanotubes for Express Pre-Concentration of Volatile Organic Compounds from the Air Flow

New composite adsorbents including silica supports (silica, aerosilogel, and diatomite) and carbon materials (multiwall carbon nanotubes and pyrolytic carbon) have been prepared and characterized. The analytical capabilities of the produced sorbents have been evaluated by their efficiency in the exp...

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Bibliographic Details
Published in:Separations 2021-04, Vol.8 (4), p.50
Main Authors: Rodinkov, Oleg, Postnov, Victor, Spivakovskyi, Valery, Vlasov, Andrey, Bugaichenko, Alexandra, Slastina, Svetlana, Znamenskaya, Ekaterina, Shilov, Roman, Lanin, Sergey, Nesterenko, Pavel
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
aerosilogel
Aerosols
Air flow
Butanol
Carbon
Chromatography
Cresols
Diatomaceous earth
Flame ionization detectors
Gas chromatography
Gases
Multi wall carbon nanotubes
multiwall carbon nanotubes
Nitrogen
Permeability
Phenols
pyrocarbon
Silicon dioxide
Sorbents
surface-layered adsorbents
Vapor deposition
VOCs
Volatile organic compounds
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Summary:New composite adsorbents including silica supports (silica, aerosilogel, and diatomite) and carbon materials (multiwall carbon nanotubes and pyrolytic carbon) have been prepared and characterized. The analytical capabilities of the produced sorbents have been evaluated by their efficiency in the express pre-concentration of volatile organic compounds (butanol and phenols) from the air stream. The prepared surface-layered adsorbents containing multiwall carbon nanotubes placed onto the surface of aerosilogel by use of the carbon vapor deposition method with preloading cobalt nanostructures as a catalyst were found significantly more efficient than traditionally used graphitic carbon-based adsorbents Carbopacks B, C, and X. Additionally, a new adsorbent composed of diatomite Porochrome-3 support coated with a pyrocarbon layer was prepared. This low surface area composited adsorbent allowed both quantitative pre-concentration of phenol and isomeric cresols from the air and their thermal desorption. The developed adsorbents provided fast pre-concentration of selected phenols with a concentration factor of 2 × 103 in 5 min and were used for gas chromatographic determination of analytes in the air at low concentration levels starting from several μg/m3 with a flame ionization detector.
ISSN:2297-8739
2297-8739
DOI:10.3390/separations8040050