Different Approaches for the Development of Low-Cost Adsorbents
Publication: Journal of Environmental Engineering
Volume 135, Issue 6
Abstract
Different carbon materials were tested as precursors for the production of adsorbents. The chemical modification of the surface of the prepared adsorbents was studied by means of three different approaches: impregnation with amines, electrophilic aromatic substitution, and heat treatment in the presence of ammonia. The samples were chemically characterized and the porous texture was evaluated from the adsorption isotherms at . The adsorption capacities of the adsorbents at 25 and were evaluated in a thermogravimetric analyzer. In general, the incorporation of basic nitrogen functionalities enhanced the capture capacities of the modified carbons, but this increase depended on the textural properties of the support and the surface modification methodology. adsorption capacities of up to at room temperature were attained. All the tested samples were completely regenerated when subjected to heat treatment at under inert atmosphere.
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Acknowledgments
This work was carried out with financial support from the Spanish MEC (Project No. UNSPECIFIEDCTM2005-03075/TECNO). M.G.P., C.F.M., and J.F. acknowledge funding from the CSIC I3P Program cofinanced by the European Social Fund, CSIC JAE Program, and Plan Regional de Investigación del Principado de Asturias, respectively.
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Published In
Journal of Environmental Engineering
Volume 135 • Issue 6 • June 2009
Pages: 426 - 432
Copyright
© 2009 ASCE.
History
Received: May 22, 2008
Accepted: Oct 29, 2008
Published online: Mar 23, 2009
Published in print: Jun 2009
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