CO2 Adsorption on Dahlia-Like Carbon Nanohorns: Isosteric Heat and Surface Area Measurements

We present the results of an adsorption study of carbon dioxide on closed dahlia-like single-walled carbon nanohorn aggregates. The study was conducted to explore the sorptive capacity of the nanohorns and the dependence of the CO2’s isosteric heat of adsorption on sorbent loading. We found that the...

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Bibliographic Details
Published in:Journal of physical chemistry. C 2012-01, Vol.116 (1), p.306-310
Main Authors: Krungleviciute, Vaiva, Migone, Aldo D, Yudasaka, M, Iijima, S
Format: Article
Language:English
Subjects:
C: Nanops and Nanostructures
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Low-dimensional structures (superlattices, quantum well structures, multilayers): structure, and nonelectronic properties
Materials science
Nanopowders
Nanoscale materials and structures: fabrication and characterization
Physics
Solid surfaces and solid-solid interfaces
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
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Summary:We present the results of an adsorption study of carbon dioxide on closed dahlia-like single-walled carbon nanohorn aggregates. The study was conducted to explore the sorptive capacity of the nanohorns and the dependence of the CO2’s isosteric heat of adsorption on sorbent loading. We found that there are no steps present in the carbon dioxide isotherms and that the isosteric heat of adsorption has an unusual nonmonotonic dependence on loading. Both of these behaviors are opposite to what is observed for other simple gases (argon, methane, neon, etc.) adsorbed on the same sorbent. The effective specific surface area of the nanohorn aggregates was determined using the BET and point-B methods.
ISSN:1932-7447
1932-7455
DOI:10.1021/jp208766u