| The adsorption of phenol and its reaction with oxygen on granular activated carbon is modeled using a dual mechanism pore and surface diffusion model and the homogeneous surface diffusion model in both batch and column systems combined with a reaction term involving phenol and oxygen adsorbate concentration.;The adsorption and reaction models are tested by fitting the experimental data generated by Abuzaid (1993). The models parameters are optimized. The resulting model is in good agreement with the experimental data. Generally, the model fits obtained from the batch studies are better than those obtained from the column studies.;The dependence of surface diffusivity coefficient on adsorbed phase concentration is accounted for by the use of Darken's relation. From experimental studies, the rate and extent of reaction is established as dependent on oxygen availability in the system. Hence, a rate of reaction expression is incorporated in the model based on the assumption that the rate is proportional to the oxygen imbalance and the adsorbed phase concentration. |
