Kinetic and equilibrium study of Alizarin Red S removal by activated carbon |
| |
| Authors: | M Ghaedi A Najibi H Hossainian A Shokrollahi M Soylak |
| |
| Institution: | 1. Chemistry Department, University of Yasouj , Yasouj 75914-353, Iran m_ghaedi@mail.yu.ac.ir;3. Chemistry Department, University of Yasouj , Yasouj 75914-353, Iran;4. Chemistry Department , University of Erciyes , 38039 Kayseri, Turkey;5. King Saud University , Riyadh, Saudi Arabia |
| |
| Abstract: | Activated carbon has been applied for the adsorption of Alizarin Red S (ARS) from the waste water in a batch method to obtain high removal percentage. The influence of variables such as pH, temperature, ARS concentration, mass and size of adsorbent, and contact time on ARS removal percentage was investigated. Different kinetics, thermodynamics, and isotherm models were applied for fitting the experimental data. The adsorption process follows a pseudo second-order kinetic model with R 2 of 0.98 and Freundlich, Tempkin, and Dubinin-Radushkevich isotherm models with high determination coefficients (R 2) of 0.91, 0.98, and 0.98, respectively. High enthalpy (positive value), Gibbs free energy (negative value), and high entropy values shows the feasibility and the endothermic spontaneous nature of the removal process. |
| |
| Keywords: | adsorption Alizarin Red S activated carbon adsorption isotherm thermodynamics of adsorption |
|
|
