Characterization of oxygen functional groups on carbon surfaces with water and methanol adsorption

Zeng, Yonghong, Prasetyo, Luisa, Nguyen, Van T., Horikawa, Toshihide, Do, D.D. and Nicholson, D. (2014) Characterization of oxygen functional groups on carbon surfaces with water and methanol adsorption. Carbon, 81 1: 447-457. doi:10.1016/j.carbon.2014.09.077


Author Zeng, Yonghong
Prasetyo, Luisa
Nguyen, Van T.
Horikawa, Toshihide
Do, D.D.
Nicholson, D.
Title Characterization of oxygen functional groups on carbon surfaces with water and methanol adsorption
Journal name Carbon   Check publisher's open access policy
ISSN 0008-6223
1873-3891
Publication date 2014-07-14
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.carbon.2014.09.077
Open Access Status
Volume 81
Issue 1
Start page 447
End page 457
Total pages 11
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon Press
Collection year 2015
Language eng
Formatted abstract
We propose a new method, using the ambient temperature adsorption of methanol in the Henry law region as a molecular probe, to determine the concentration of surface oxygen functional groups (Cα) on carbon adsorbents. Two adsorbents: porous A5 and non-porous Carbopack F have been chosen here as experimental examples. The theoretical Henry constant (Kα) is the product of the intrinsic interaction between a methanol molecule and one functional group, α, having a concentration (Cα) and is estimated by carrying out a volume integration of the Boltzmann factor for methanol interacting with the functional group. Our results show that Cα determined with methanol for A5 compares well with that determined previously with water as the molecular probe (Nguyen, 2014 [1]); and both are in good agreement with results from Boehm titration. For Carbopack F, we find that Cα, determined by methanol adsorption, gives more realistic concentrations than those obtained by Boehm titration, which are subject to large errors because of the very low concentration of the functional groups. The method proposed here is fast and easy to implement, and serves as an alternative to the Boehm titration technique.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2015 Collection
 
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