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Activated carbon fibers for efficient VOC removal from diluted streams: the role of surface functionalities

Baur, Guillaume ; Beswick, Oliver ; Spring, Jonathan ; Yuranov, Igor ; Kiwi-Minsker, Lioubov

In: Adsorption, 2015, vol. 21, no. 4, p. 255-264

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    Titre
    • Activated carbon fibers for efficient VOC removal from diluted streams: the role of surface functionalities
    Auteur
    • Baur, Guillaume. Group of Catalytic Reaction Engineering, Ecole Polytechnique Fédérale de Lausanne, EPFL-SB-ISIC-GGRC, Station 6, 1015, Lausanne, Switzerland
    • Beswick, Oliver. Group of Catalytic Reaction Engineering, Ecole Polytechnique Fédérale de Lausanne, EPFL-SB-ISIC-GGRC, Station 6, 1015, Lausanne, Switzerland
    • Spring, Jonathan. Group of Catalytic Reaction Engineering, Ecole Polytechnique Fédérale de Lausanne, EPFL-SB-ISIC-GGRC, Station 6, 1015, Lausanne, Switzerland
    • Yuranov, Igor. Group of Catalytic Reaction Engineering, Ecole Polytechnique Fédérale de Lausanne, EPFL-SB-ISIC-GGRC, Station 6, 1015, Lausanne, Switzerland
    • Kiwi-Minsker, Lioubov. Group of Catalytic Reaction Engineering, Ecole Polytechnique Fédérale de Lausanne, EPFL-SB-ISIC-GGRC, Station 6, 1015, Lausanne, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Adsorption, 2015, vol. 21, no. 4, p. 255-264. Springer US; http://www.springer-ny.com
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:331204
    Summary
    The effect of surface functionalities, specific surface area and pore size of activated carbon fibers (ACFs) on the adsorption of toluene and acetaldehyde, two volatile organic compounds (VOC), at low concentrations (~80ppmv) and short contact time (20ms) has been studied. Two different types of ACFs characterized by low temperature N2 adsorption: ultramicroporous (d pore <1nm) and supermicroporous (d pore ~1-2nm) were tested. Both ACFs were effective for the removal of toluene attaining the adsorption capacity as large as 51wt%. The surface chemistry of ACFs (O-containing functional groups) was characterized by temperature-programmed desorption monitoring the CO/CO2 evolved. Oxidative treatment of ACFs by nitric acid increased the surface concentration of O-groups. This resulted in lower adsorption capacity towards toluene but higher one towards acetaldehyde. This result was rationalized based on different type of VOC interactions with the carbon surface.