Effect of the surface chemical groups of activated carbons on their surface adsorptivity to aromatic adsorbates based on π-π interactions

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Título: Effect of the surface chemical groups of activated carbons on their surface adsorptivity to aromatic adsorbates based on π-π interactions
Autor/es: Godino-Salido, M. Luz | López-Garzón, Rafael | Gutiérrez-Valero, María D. | Arranz-Mascarós, Paloma | Melguizo-Guijarro, Manuel | López de la Torre, María D. | Gómez-Serrano, Vicente | Alexandre-Franco, María | Lozano Castelló, Dolores | Cazorla-Amorós, Diego | Domingo-García, María
Grupo/s de investigación o GITE: Materiales Carbonosos y Medio Ambiente
Centro, Departamento o Servicio: Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales
Palabras clave: Microporous materials | Surfaces | Chemical techniques | Photoelectron spectroscopy | Adsorption | Desorption
Área/s de conocimiento: Química Inorgánica
Fecha de publicación: 14-feb-2014
Editor: Elsevier
Cita bibliográfica: Materials Chemistry and Physics. 2014, 143(3): 1489-1499. doi:10.1016/j.matchemphys.2013.12.005
Resumen: Three activated carbons with different surface chemical groups were used to analyse the influence of these groups on their adsorption capacities towards aromatic-type molecules whose adsorption is based on π-π interactions with surface arene centres. The three activated carbons studied were a low-functionalized carbon (Merck), an oxygen-rich carbon obtained by HNO3 oxidation of Merck, and a nitrogen-rich carbon also prepared from Merck by mild HNO3 oxidation followed by treatment with a dicyanodiamide/dimethyl formamide mixture at 300 °C. The nature of the surface chemical groups of the three activated carbons was investigated by both physical and chemical techniques (TPD, XPS, Boehm analysis and pH potentiometric titration). A systematic study of the adsorptions of a series of analogous aromatic adsorbates on the three activated carbons was carried out to study the adsorption mechanisms. In all cases the adsorption mechanism is based on π-π interactions between the aromatic moiety of the adsorbates and the arene centres of the graphite sheets. The differences in the normalized adsorption capacities of the adsorbents for a set of adsorbates indicate that the π-donor or π-withdrawing character of the functional groups have a clear influence on the basicity of the arene centres.
Patrocinador/es: The support of the MICINN (projects MAT2009-14185-C02-01 and MAT2009-14185-C02-02), the Autonomous Regional Government (J. de Andalucía, Proyecto de Excelencia ref: P09-FQM-4765 and grupo FQM273) and the University of Jaén and Caja Rural de Jaén (project UJA2009/12/17) is acknowledged.
URI: http://hdl.handle.net/10045/44757
ISSN: 0254-0584 (Print) | 1879-3312 (Online)
DOI: 10.1016/j.matchemphys.2013.12.005
Idioma: eng
Tipo: info:eu-repo/semantics/article
Derechos: © 2013 Elsevier B.V.
Revisión científica: si
Versión del editor: http://dx.doi.org/10.1016/j.matchemphys.2013.12.005
Aparece en las colecciones:INV - MCMA - Artículos de Revistas

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