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Carbonaceous Porous Materials for the Adsorption of Heavy Metals: Chemical Characterization of Oxidized Activated Carbons

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Green Adsorbents for Pollutant Removal

Abstract

The contamination of water sources by heavy metals is one of the main environmental concerns today, due to the intrinsic toxicity, long lifetime and bioaccumulation properties of these kinds of pollutants. The use of carbonaceous porous materials as adsorbents for preconcentration of pollutants is an application that emerges as an alternative that draws attention in the treatment of industrial effluents. A thorough knowledge of surface chemistry enables the preparation of adsorbents with appropriate characteristics resulting in new useful properties for specific applications, it is possible to modify the chemistry surface of carbonaceous porous materials by introducing oxygenated groups while essentially maintaining their original porous texture. Different processes are used for this purpose: oxidation, functionalization and thermal treatments.

The importance of surface chemistry of the porous solids on the adsorption of metal ions from aqueous solution is mainly due to specific interactions between surface groups and dissolved species in solution through different mechanisms including: the formation of metal complexes, reactions of acceptor-donor electrons, and ionic exchange. The present work deals with the effect of chemical modification on the surface of a granular activated carbon, by oxidation with nitric acid, sodium hypochlorite, and hydrogen peroxide, in ions metal adsorption from aqueous solution. The surface chemistry was evaluated by Boehm and potentiometric titrations, groups total evaluated by Boehm titration varies between 247.7 and 529.7 μmol.g−1, thermogravimetric analysis coupled to mass spectroscopy and point of zero charge, showing the effect of the oxidizing agent in textural parameters such as BET surface area and pore volumes which were assessed by gas adsorption. The BET surface area values of the solids are between 687 and 889 m2 g−1.

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Acknowledgments

The authors wish to thank the framework agreement established between the Universidad Nacional de Colombia and Universidad de Los Andes (Bogotá, Colombia). Also they want express their acknowledgments to Dr. Teresa Bandosz scientific support to carry out this research. The authors also wish to thank the grant by the Faculty of Sciences of Universidad de los Andes (Colombia) in all of No. 28-11-2017 Call 2018-2019 for the funding of research programs for Professors of Associated, Full Professors and Emeritus Professors (classified in the Professoral order).

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Correspondence to Juan Carlos Moreno-Piraján .

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Rodríguez-Estupiñán, P., Giraldo, L., Moreno-Piraján, J.C. (2018). Carbonaceous Porous Materials for the Adsorption of Heavy Metals: Chemical Characterization of Oxidized Activated Carbons. In: Crini, G., Lichtfouse, E. (eds) Green Adsorbents for Pollutant Removal. Environmental Chemistry for a Sustainable World, vol 18. Springer, Cham. https://doi.org/10.1007/978-3-319-92111-2_5

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