Sorption Kinetics on Open Carbon Nanohorn Aggregates: The Effect of Molecular Diameter.
We present the results of a study of the kinetics of adsorption on aggregates of open carbon nanohorns using argon and CF₄ sorbates. We measured the equilibration times for each value of the sorbent loading along eight adsorption isotherms (four isotherms for each sorbate species). We found that: the equilibration times decrease as the sorbent loading (and the equilibrium pressure of the coexisting gas) increases, for a given temperature; and, that, for a given value of the sorbent loading, the equilibration times decrease with increasing temperature. When considering the effect of scaling of the temperatures by the respective critical temperatures we found that, at the same scaled temperature and at comparable loadings, the equilibration times for CF₄ were longer than those for argon. We discuss a possible explanation for this result.
Department of Physics, Southern Illinois University, Carbondale, IL 62901, USA. bricer@siu.edu.
Brice A
BA
Russell
Department of Physics, Southern Illinois University, Carbondale, IL 62901, USA. khanal@siu.edu.
Pravin
P
Khanal
Department of Physics &amp; Astronomy, University of Denver, Denver, CO 80208-6900, USA. Maria.Calbi@du.edu.
Maria M
MM
Calbi
National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8565, Japan. m-yudasaka@aist.go.jp.|Graduate School of Science and Technology, Meijo University, Shiogamaguchi, Tempaku, Nagoya 468-8502, Japan. m-yudasaka@aist.go.jp.
Masako
M
Yudasaka
Graduate School of Science and Technology, Meijo University, Shiogamaguchi, Tempaku, Nagoya 468-8502, Japan. chie@ccmails.meijo-u.ac.jp.
Sumio
S
Iijima
Department of Physics, Southern Illinois University, Carbondale, IL 62901, USA. aldo@physics.siu.edu.
Aldo D
AD
Migone
D000327:Adsorption; D001128:Argon / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry*; D005466:Fluorocarbons / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008956:Models, Chemical; D013696:Temperature; D014874:Water Pollutants, Chemical
D005466:Fluorocarbons; D014874:Water Pollutants, Chemical; D001128:Argon; D002244:Carbon; C035066:carbon tetrafluoride
Carbon Nanohorns; adsorption; adsorption isotherm; kinetics of adsorption; linear driving force model; sorption