Abstract

RODRIGUEZ, Giovanny; GIRALDO, Liliana  and  MORENO, Juan Carlos. IMMERSION ENTHALPIES OF ACTIVATED CARBON CLOTHS AS PHYSICAL CHEMISTRY CHARACTERIZATION PARAMETER. Rev.Colomb.Quim. [online]. 2009, vol.38, n.3, pp.435-445. ISSN 0120-2804.

The immersion enthalpies of five activated carbon cloths in carbon, CCl₄,H₂O and NaOH and HCl 0.1 M solutions are determined. The surface area values of the cloths are between 243 and 848 m²g^-1 and exhibit a linear relationship with the immersion enthalpies in CCl4. The immersion enthalpies of carbon cloths are between 5.49 and 42.3 Jg^-1 for CCl₄ and 3.83 and 7.54 Jg^-1 for H2O. The immersion enthalpies in the solutions are related to the contents of acidic and basic groups and find that in the first case to increase the immersion enthalpy in NaOH increases the total acidity. Hydrophobic factor is calculated from the immersion enthalpies in CCl₄ and H₂O, that indicate the interaction with polar and apolar compounds, and also relates to pH_PZC each sample.

Keywords : activated carbon cloth; adsorption isotherm; immersion calorimetry; acidic and basic groups; hydrophobic factor.

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