Chemical kinetics modelling of the adsorption of oxytetracycline onto activated carbon in a closed loop fixed bed reactor

Dj. Djedouani, M. Chabani


Abstract: The sorption mechanism is usually described by models that contain kinetic parameters which varied with the operating conditions. They are therefore difficult to use and not practical to scale-up. Another approach is therefore proposed in this work based on the determination of the equation rates related to the sorbate-sorbent interactions instead of the system operating conditions.

Three adsorption kinetic models are presented in this paper, which have been applied to test if the integral or differential modeling approach is appropriate to describe the kinetics at the solid/solution interface.

Activated carbon/antibiotic was the considered adsorbent-adsorbate system..The ability of activated carbon ECA08 (AC) to adsorb oxytetracycline (OTC) was investigated in batch mode in a fixed bed reactor. The fitting of experimental data showed that the differential method led to an excellent accuracy for different initial concentrations of the adsorbate; this method appeared more relevant than the integral method. The results also showed that AC was very effective in removing OTC from an aqueous solution, with up to 98% removal.

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