Theoretical and experimental study of cephalexin batch adsorption dynamics using walnut shell-based activated carbon
| Autor: | Moein Assar, Ghadir Nazari, Mohamad Esmaieli, Hossein Abolghasemi |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Chromatography
Contact time Chemistry Kinetics Shell (structure) Thermodynamics Ocean Engineering 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Thermal diffusivity 01 natural sciences Pollution 0104 chemical sciences Adsorption medicine Freundlich equation Activation method 0210 nano-technology Water Science and Technology Activated carbon medicine.drug |
| Zdroj: | Desalination and Water Treatment. 57:27339-27348 |
| ISSN: | 1944-3986 1944-3994 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|