Abstract
Batch adsorption of cephalexin (CFX) by walnut shell activated carbon is studied both experimentally and mathematically. Firstly, the adsorbent was prepared by chemical activation method in the presence of ZnCl2. Next, the values of adsorbent dosage and pH were optimized. Then, the effect of initial CFX concentration and contact time was studied to evaluate the kinetics and the equilibrium isotherm. It is found that the Freundlich and Toth models provided the best fit to the experimental data. Dynamic characteristics of this process are mathematically modeled. In the developed model, pore diffusivity is estimated according to the experimental results. The model reveals good agreement with experiment. The effective diffusivity of CFX in the walnut shell AC is estimated as 0.47 × 10−9 m2 s−1.
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