Journal
CARBON
Volume 43, Issue 8, Pages 1758-1767Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2005.02.023
Keywords
activated carbon; adsorption; porosity; surface properties
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This paper deals with the study of the effect that the porosity and the surface chemistry of the activated carbons have on the adsorption of two VOC (benzene and toluene) at low concentration (200 ppmv). In this sense, activated carbons with very different porosities and contents in oxygen surface groups have been tested. Our results regarding the effect of the porosity show that the volume of narrow micropores (size < 0.7 nm) seems to govern the adsorption of VOC at low concentration, specially for benzene adsorption. Regarding the surface chemistry, AC with low content in oxygen surface groups have the best adsorption capacities. Among the AC tested, those prepared by chemical activation with hydroxides exhibit the higher adsorption capacities for VOC. The adsorption capacities achieved are higher than those previously shown in the literature for these conditions, specially for toluene. Adsorption capacities as high as 34 g benzene/100 g AC or 64 g toluene/100 g AC have been achieved. (c) 2005 Elsevier Ltd. All rights reserved.
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