Batch adsorption of trichlorotrifluoroethane (freon‐113) onto activated carbon — surface diffusivity and pore diffusivity

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<jats:title>Abstract</jats:title><jats:p>Activated carbon was found more active than molécular sieve 13X and silica gel in adsorbing 1,1,2 trichloro‐1,2,2 trifluoroethane (CFE). Batch adsorption experiments were carried out with activated carbon to adsorb CFE at 15, 25 and 30°C. The adsorption isotherms of CFE on activated carbon were of the Langmuir type: <jats:italic>q</jats:italic>(<jats:italic>C</jats:italic>) = <jats:italic>q</jats:italic><jats:sub><jats:italic>m</jats:italic></jats:sub> <jats:italic>KC</jats:italic> / (1 + <jats:italic>KC</jats:italic>) where <jats:italic>q</jats:italic><jats:sup><jats:italic>m</jats:italic></jats:sup> and <jats:italic>K</jats:italic> were evaluated for the three temperatures. The measured bulk concentration‐time data were interpreted equally well with the surface diffusion model and the pore diffusion model; for the former model the surface diffusivity increased with increasing initial CFE concentration, and for the latter the pore diffusivity was independent upon the initial CFE concentration.</jats:p>

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