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Open Chemistry

formerly Central European Journal of Chemistry

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Volume 13, Issue 1


Volume 13 (2015)

Calorimetric study of activated carbons impregnated with CaCl2

Diana Paola Vargas
  • Corresponding author
  • Departamento de Química. Facultad de Ciencias. Universidad Nacional de Colombia. Avenida Carrera 30 No. 45-03. Bogotá
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Liliana Giraldo
  • Departamento de Química. Facultad de Ciencias. Universidad Nacional de Colombia. Avenida Carrera 30 No. 45-03. Bogotá
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Juan Carlos Moreno-Piraján
  • Departamento de Química. Facultad de Ciencias. Universidad Nacional de Colombia. Avenida Carrera 30 No. 45-03. Bogotá
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2015-01-12 | DOI: https://doi.org/10.1515/chem-2015-0075


Activated carbon monoliths with different surface characteristics were prepared by impregnating oil palm stone with diluted aqueous CaCl2 solutions (with concentrations between 2 and 7% w/v) without binders. The solids were characterized by determination of nitrogen adsorption isotherms at 77 K and carbon dioxide adsorption isotherms at 273 K using volumetric adsorption equipment. Surface area and micropore volume values were calculated from the nitrogen isotherms using the BET and DR models, respectively, obtaining solids with low percentages of mesoporosity. Immersion enthalpies of the activated carbon monoliths were determined in benzene, with values between -173 and -104 J g-1, and water, with values between 61 and 30 J g-1, indicating that the monoliths have a hydrophobic character.

Graphical Abstract

Keywords : activated carbon monoliths; CaCl2 impregnation; N2 adsorption; CO2 adsorption; immersion enthalpies


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About the article

Received: 2014-06-16

Accepted: 2014-08-18

Published Online: 2015-01-12

Citation Information: Open Chemistry, Volume 13, Issue 1, ISSN (Online) 2391-5420, DOI: https://doi.org/10.1515/chem-2015-0075.

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© 2015 Diana Paola Vargas et al.. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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