DYNAMIC ADSORPTION OF METHYL-IODIDE ON ACTIVATED CARBONS

The adsorption at the Henry's law region of CH3I 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, DELTA-H(A)-degrees, and the heat of liquefaction of the adsorptive, DELTA-H(L)-degrees, indicates that the adsorption takes place on micropores whose sizes are commensurate with the size of CH3I, although adsorbent-adsorbate interactions are nonspecific. Finally, from the DELTA-H(A)-degrees and DELTA-G(A)-degrees values, the evolution of the microporosity of the samples with the increase of the period of treatment was established.