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Active and passive adsorption of 47 trace atmospheric volatile organic compounds onto carbon nanotubes

Carbon nanotubes (CNTs) of varying sizes and CNTs functionalised with carboxylic acids were examined by thermal desorption gas chromatography mass spectrometry (TD-GCMS) to determine the degree of surface contamination of atmospheric volatile organic compounds (VOCs). The CNTs could be purged of phy...

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Detalles Bibliográficos
Autores principales: Wong, Gwendeline K. S., Webster, Richard D.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9040896/
https://www.ncbi.nlm.nih.gov/pubmed/35480271
http://dx.doi.org/10.1039/d1ra05585b
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author Wong, Gwendeline K. S.
Webster, Richard D.
author_facet Wong, Gwendeline K. S.
Webster, Richard D.
author_sort Wong, Gwendeline K. S.
collection PubMed
description Carbon nanotubes (CNTs) of varying sizes and CNTs functionalised with carboxylic acids were examined by thermal desorption gas chromatography mass spectrometry (TD-GCMS) to determine the degree of surface contamination of atmospheric volatile organic compounds (VOCs). The CNTs could be purged of physisorbed VOCs by heating to 380 °C under a stream of purified nitrogen gas. As soon as the cleaned CNTs were exposed to atmospheric air they spontaneously adsorbed trace VOCs. As well as passive adsorption of VOCs, active sampling was carried out by pumping atmospheric air through the CNTs and comparing the results with the standard multisorbent materials Carbopack X and Tenax that are used widely for VOC trapping and analysis. The CNTs were found to trap many VOCs at a comparable level to the standard sorbent materials. Therefore, to maintain the CNTs in a pristine condition, it is recommended that they are first heated under vacuum to remove residual physisorbed VOCs, and then stored under vacuum or in a purified inert gas atmosphere.
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spelling pubmed-90408962022-04-26 Active and passive adsorption of 47 trace atmospheric volatile organic compounds onto carbon nanotubes Wong, Gwendeline K. S. Webster, Richard D. RSC Adv Chemistry Carbon nanotubes (CNTs) of varying sizes and CNTs functionalised with carboxylic acids were examined by thermal desorption gas chromatography mass spectrometry (TD-GCMS) to determine the degree of surface contamination of atmospheric volatile organic compounds (VOCs). The CNTs could be purged of physisorbed VOCs by heating to 380 °C under a stream of purified nitrogen gas. As soon as the cleaned CNTs were exposed to atmospheric air they spontaneously adsorbed trace VOCs. As well as passive adsorption of VOCs, active sampling was carried out by pumping atmospheric air through the CNTs and comparing the results with the standard multisorbent materials Carbopack X and Tenax that are used widely for VOC trapping and analysis. The CNTs were found to trap many VOCs at a comparable level to the standard sorbent materials. Therefore, to maintain the CNTs in a pristine condition, it is recommended that they are first heated under vacuum to remove residual physisorbed VOCs, and then stored under vacuum or in a purified inert gas atmosphere. The Royal Society of Chemistry 2021-09-07 /pmc/articles/PMC9040896/ /pubmed/35480271 http://dx.doi.org/10.1039/d1ra05585b Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Wong, Gwendeline K. S.
Webster, Richard D.
Active and passive adsorption of 47 trace atmospheric volatile organic compounds onto carbon nanotubes
title Active and passive adsorption of 47 trace atmospheric volatile organic compounds onto carbon nanotubes
title_full Active and passive adsorption of 47 trace atmospheric volatile organic compounds onto carbon nanotubes
title_fullStr Active and passive adsorption of 47 trace atmospheric volatile organic compounds onto carbon nanotubes
title_full_unstemmed Active and passive adsorption of 47 trace atmospheric volatile organic compounds onto carbon nanotubes
title_short Active and passive adsorption of 47 trace atmospheric volatile organic compounds onto carbon nanotubes
title_sort active and passive adsorption of 47 trace atmospheric volatile organic compounds onto carbon nanotubes
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9040896/
https://www.ncbi.nlm.nih.gov/pubmed/35480271
http://dx.doi.org/10.1039/d1ra05585b
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