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Journal of Thermal Analysis and Calorimetry

, Volume 138, Issue 4, pp 2565–2575 | Cite as

Immersion enthalpy of benzene/cyclohexane and toluene/cyclohexane binary mixtures into modified activated carbons

  • Diana Hernández-Monje
  • Liliana Giraldo
  • Juan Carlos Moreno-PirajánEmail author
Article
  • 26 Downloads

Abstract

The interaction between binary mixtures of benzene/cyclohexane and toluene/cyclohexane into three activated carbons with different physical and chemical properties was determined by means of immersion enthalpy. The solids had areas between 935 and 816 m2 g−1 and pore volumes between 0.32 and 0.35 cm3 g−1. A cyclic chain aliphatic compound and two aromatic compounds were used, one of them with an aliphatic substitution of a carbon; the above, to verify the influence of the components of the mixture with different molar compositions in the process of interaction between the adsorbent and the adsorbate. For wetting liquids, the energy of interaction is higher in the aromatic compounds (benzene: between − 145.10 and − 94.98 J g−1; toluene: − 126.10 and − 59.06 J g−1) than with cyclohexane (− 91.71 and − 21.23 J g−1). For the mixtures, the values are between − 34.22 and − 109.52 J g−1. The contributions of each of the components of the mixture to the adsorbate–porous solid interaction were also determined. It was found that the decrease in surface groups favors the interaction with the compounds of interest and the activated carbon, since the solid that showed the highest interaction for both the wetting liquids separately and for the mixtures is the modified activated carbon at the highest activation temperature (750 °C); on the other hand, the sample with the highest content of oxygenated surface groups presented the least interaction with each of the components and with the mixtures.

Keywords

Immersion enthalpy Differential enthalpy of immersion Adsorption Activated carbon Hydrocarbons 

Notes

Acknowledgements

The authors thank the Framework Agreement between the Universidad de los Andes and the Universidad Nacional de Colombia and the act of agreement established between the Chemistry Departments of the two universities. The authors also appreciate the grant for the funding of research programs for Associate Professors, Full Professors and Emeritus Professors announced by the Faculty of Sciences of the University of the Andes (Grant No. 11-28-2017, 2018–2019), 20-12-2019–2020, 2019, according to the project “Enthalpy, free energy and adsorption energy of the activated carbon interaction and solutions of emerging organic compounds”. The authors also thank to the Colciencias Scholarship “Doctorados Nacionales 2016” Convocation 757.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  1. 1.Departamento de Química, Facultad de CienciasUniversidad Nacional de ColombiaBogotáColombia
  2. 2.Departamento de Química, Facultad de CienciasUniversidad de los AndesBogotáColombia

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