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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/20043

Title: Control of the spatial homogeneity of pore surface chemistry in particulate activated carbon
Authors: Sedghi, Saeid
Madani, S. Hadi
Hu, Cheng
Silvestre-Albero, Ana
Skinner, William
Kwong, Philip
Pendleton, Phillip
Smernik, Ronald J.
Rodriguez-Reinoso, Francisco
Biggs, Mark J.
Issue Date: 2015
Publisher: © Elsevier
Citation: SEDGHI, S. ...et al., 2015. Control of the spatial homogeneity of pore surface chemistry in particulate activated carbon. Carbon, 95, pp. 144-149.
Abstract: We show here that a physical activation process that is diffusion-controlled yields an activated carbon whose chemistry – both elemental and functional – varies radially through the particles. For the ∼100 μm particles considered here, diffusion-controlled activation in CO2 at 800 °C saw a halving in the oxygen concentration from the particle periphery to its center. It was also observed that this activation process leads to an increase in keto and quinone groups from the particle periphery towards the center and the inverse for other carbonyls as well as ether and hydroxyl groups, suggesting the two are formed under CO2-poor and -rich environments, respectively. In contrast to these observations, use of physical activation processes where diffusion-control is absent are shown to yield carbons whose chemistry is radially invariant. This suggests that a non-diffusion limited activation processes should be used if the performance of a carbon is dependent on having a specific optimal pore surface chemical composition.
Description: This paper is in closed access.
Version: Published
DOI: 10.1016/j.carbon.2015.08.019
URI: https://dspace.lboro.ac.uk/2134/20043
Publisher Link: http://dx.doi.org/10.1016/j.carbon.2015.08.019
ISSN: 0008-6223
Appears in Collections:Closed Access (Chemistry)

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