Kinetic, equilibrium and thermodynamic study on the removal of Congo Red from aqueous solutions by adsorption onto apricot stone

- Activated carbon prepared from apricot stones is used for the Congo Red adsorption.
- The experimental data were fitted by the Dubinin-Radushkevich and Langmuir models.
- The adsorption of Congo Red follows the pseudo-second order kinetic model.
- The thermodynamic parameters show a spontaneous and endothermic adsorption process.