Factors governing the adsorption of ethanol on spherical activated carbons

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Title: Factors governing the adsorption of ethanol on spherical activated carbons
Authors: Romero Anaya, Aroldo José | Lillo-Rodenas, Maria Angeles | Linares-Solano, Angel
Research Group/s: Materiales Carbonosos y Medio Ambiente
Center, Department or Service: Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales
Keywords: Ethanol adsorption | Spherical activated carbons
Knowledge Area: Química Inorgánica
Issue Date: Mar-2015
Publisher: Elsevier
Citation: Carbon. 2015, 83: 240-249. doi:10.1016/j.carbon.2014.10.092
Abstract: Ethanol adsorption on different activated carbons (mostly spherical ones) was investigated covering the relative pressure range from 0.001 to 1. Oxygen surface contents of the ACs were modified by oxidation (in HNO3 solution or air) and/or by thermal treatment in N2. To differentiate the concomitant effects of porosity and oxygen surface chemistry on ethanol adsorption, different sets of samples were used to analyze different relative pressure ranges (below 1000 ppmv concentration and close to unity). To see the effect of oxygen surface chemistry, selected samples having similar porosity but different oxygen contents were studied in the low relative pressure range. At low ethanol concentration (225 ppmv) adsorption is favored in oxidized samples, remarking the effect of the oxidizing treatment used (HNO3 is more effective than air) and the type of oxygen functionalities created (carboxyl and anhydride groups are more effective than phenolic, carbonyl and derivatives). To analyze the high relative pressure range, spherical and additional ACs were used. As the relative pressure of ethanol increases, the effect of oxygen-containing surface groups decreases and microporosity becomes the most important variable affecting the adsorption of ethanol.
Sponsor: Authors thank Generalitat Valenciana – Spain (PROMETEOII/2014/010), MINECO (MAT-2012-32832), MICINN – Spain and plan E (CTQ2012-3176) for financial support.
URI: http://hdl.handle.net/10045/44126
ISSN: 0008-6223 (Print) | 1873-3891 (Online)
DOI: 10.1016/j.carbon.2014.10.092
Language: eng
Type: info:eu-repo/semantics/article
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/j.carbon.2014.10.092
Appears in Collections:INV - MCMA - Artículos de Revistas

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