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Calorimetric determination of activated carbons in aqueous solutions

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Abstract

The interactions among five samples of activated carbons, obtained from different lignocellulosic materials with different degrees of activation of approximately 20% and aqueous solutions of phenol and 4-nitro phenol are studied by means of the determination of immersion enthalpies.

It is established that the obtained activated carbons are of a basic character and show values for the pH at the point of zero charge, pHPZC, that range from 7.4 to 9.7 and, in all cases, higher total basicity contents than the values obtained for total acidity.

The immersion heat of the activated carbons in CCl4 and water is determined obtaining values which are higher for CCl4 immersion and vary from 31.4 to 48.6 J g−1. The hydrophobic factor, hf, it is calculated from the relation between of the immersion heat of the activated carbons in CCl4 and the immersion heat in water, the obtained values were 2.98 and 6.75, which are greater than 1 due to the greater values obtained in CCl4 when compared to the values obtained in water.

Immersion enthalpies in phenol solution range from 7.6 to 13.9 J g−1 and for the case of 4-nitro phenol such enthalpies range from 12.7 to 20.5 J g−1; all the 5 samples studied showed a higher value for the heat of immersion in aqueous solutions of 4-nitro phenol.

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Authors and Affiliations

  1. Departamento de Quimica, Facultad de Ciencias, Universidad Nacional de Colombia, San Andrés, Columbia

    Liliana Giraldo

  2. Departamento de Quimica, Facultad de Ciencias, Grupo de Investigación en Sólidos Porosos y Calorimetría, Universidad de los Andes, San Andrés, Columbia

    J. C. Moreno-Piraján

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  1. Liliana Giraldo
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  2. J. C. Moreno-Piraján
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Correspondence to J. C. Moreno-Piraján.

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Giraldo, L., Moreno-Piraján, J.C. Calorimetric determination of activated carbons in aqueous solutions. J Therm Anal Calorim 89, 589–594 (2007). https://doi.org/10.1007/s10973-006-7524-3

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  • DOI: https://doi.org/10.1007/s10973-006-7524-3

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