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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Title: | 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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Authors: | 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-Castello, Dolores | Cazorla-Amorós, Diego | Domingo-García, María |
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: | Microporous materials | Surfaces | Chemical techniques | Photoelectron spectroscopy | Adsorption | Desorption |
Knowledge Area: | Química Inorgánica |
Issue Date: | 14-Feb-2014 |
Publisher: | Elsevier |
Citation: | Materials Chemistry and Physics. 2014, 143(3): 1489-1499. doi:10.1016/j.matchemphys.2013.12.005 |
Abstract: | 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. |
Sponsor: | 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 |
Language: | eng |
Type: | info:eu-repo/semantics/article |
Rights: | © 2013 Elsevier B.V. |
Peer Review: | si |
Publisher version: | http://dx.doi.org/10.1016/j.matchemphys.2013.12.005 |
Appears in Collections: | INV - MCMA - Artículos de Revistas |
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File | Description | Size | Format | |
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2014_Godino_etal_MatChemPhys_final.pdf | Versión final (acceso restringido) | 1,71 MB | Adobe PDF | Open Request a copy |
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