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Accessible area and hydrophobicity of activated carbons obtained from the enthalpy characterization

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Abstract

Were determined the immersion enthalpy in benzene and water for 24 carbonaceous materials, granular activated carbon and activated carbon monoliths prepared from African palm stone by chemical activation with H3PO4, ZnCl2 and CaCl2 solutions. The immersion enthalpies in benzene and water were exothermic, in accordance with a surface process that takes place between the solid and liquid. Benzene enthalpies for this set of solids were −20.26 and −181.1 J g−1 and water enthalpies were between −7.42 and −67.01 J g−1. The textural and chemical surface properties of the activated carbons were related to the immersion enthalpies. Since the evaluation of the porous structure was made with non-polar liquids with which the solid does not have a specific interaction, immersion enthalpy was proportional to the surface area accessible to liquid molecules, which was calculated from the enthalpic determinations based on the assumption of the existence of a direct relationship between the immersion enthalpy and the total area of the solid accessible to liquid molecules. The hydrophobic factor was calculated by dividing the immersion enthalpy in benzene and the immersion enthalpy in water; this is related to the acidity, basicity and hydrophobicity of the activated carbons.

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Acknowledgments

The authors thank the Framework Agreement between Universidad de los Andes and Universidad Nacional de Colombia, as well as the Agreement Statement (Acta de Acuerdo) between the Departments of Chemistry of both Universities.

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Authors and Affiliations

  1. Departamento de Química, Facultad de Ciencias, Universidad del Tolima, Ibagué, Colombia

    Diana P. Vargas

  2. Departamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia, Bogotá, Colombia

    Liliana Giraldo

  3. Laboratorio de Sólidos Porosos and Calorimetría, Departamento de Química, Facultad de Ciencias, Universidad de los Andes, Bogotá, Colombia

    Juan Carlos Moreno-Piraján

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  1. Diana P. Vargas
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  2. Liliana Giraldo
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  3. Juan Carlos Moreno-Piraján
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Correspondence to Diana P. Vargas.

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Vargas, D.P., Giraldo, L. & Moreno-Piraján, J.C. Accessible area and hydrophobicity of activated carbons obtained from the enthalpy characterization. Adsorption 22, 3–11 (2016). https://doi.org/10.1007/s10450-015-9721-5

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