1ST APPROACH OF DESORPTION ENERGIES OF WATER AND ORGANIC-MOLECULES ONTO ACTIVATED CARBON BY DIFFERENTIAL SCANNING CALORIMETRY STUDIES

The authors have determined the adsorption energies of water and organic materials on saturated and unsaturated activated carbons. The original technique used is the differential scanning calorimetry method (DSC). Water is always found to be present in the inner structure of the activated carbons. This water has a low energy of interaction. The desorption enthalpies have been determined for carbon loaded with organic compounds. An energy distribution is shown for some molecules and then approaches of the adsorption mechanisms are confirmed. The energy values are compared with the literature data determined by other analytical methods. The energies of solid solute interactions have been related to physical and chemical parameters of the solute. A good correlation is found for families of molecules.