Abstract
The adsorption at the Henry's law region of CH 3I on several activated carbons was studied by gas-solid chromatography. The thermodynamic functions at zero surface coverage were obtained. The difference between the standard differential enthalpy of adsorption for each carbon, ΔH° A , and the heat of liquefaction of the adsorptive, ΔH° L , indicates that the adsorption takes place on micropores whose sizes are commensurate with the size of CH 3I, although adsorbent-adsorbate interactions are nonspecific. Finally, from the ΔH° A and ΔG° A values, the evolution of the microporosity of the samples with the increase of the period of treatment was established.
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