Adsorption Properties of Single -Walled Carbon Nanotubes for Air Quality Engineering
Agnihotri, Sandeep
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https://hdl.handle.net/2142/83270
Description
Title
Adsorption Properties of Single -Walled Carbon Nanotubes for Air Quality Engineering
Author(s)
Agnihotri, Sandeep
Issue Date
2005
Doctoral Committee Chair(s)
Rood, Mark J.
Department of Study
Civil and Environmental Engineering
Discipline
Civil and Environmental Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Environmental
Language
eng
Abstract
The adsorption capacities of nanotubes were also determined for pure organic vapors, water vapor and mixtures of organic and water vapor. Adsorption of organic vapors depended mainly on the sample morphology with a maximum uptake equivalent to only ≈50% of the total pore volume of the sample. The adsorption capacities appeared unaffected by the physical properties of the organic vapors. The adsorption of water vapor was equivalent to only 10--15% of the total pore volume, which indicated that nanotubes are extremely hydrophobic. It was also observed that when mixtures of organic and water vapor were allowed to adsorb onto nanotubes, water adsorbed in the internal volume of the nanotubes while organic vapors adsorbed onto the outer surface of the nanotubes. This information is useful to understand how nanotubes can be used for conditions such as when organic vapors exist at very low concentrations (10's of ppbv) and or when adsorption of organic vapors is desired from gas streams saturated with water vapor.
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