Investigation of adsorption thermodynamics on removal of reactive blue 19 onto activated carbon under ultrasonic irradiation

Adsorption thermodynamics of reactive blue 19,which is commonly used in textile industry,has been studied onto activated carbon. the adsorption experiments have been carried out using combined ultrasound/activated carbon. the equilibrium adsorption data were analyzed by using the langmuir and freundlich isotherms. the equilibrium parameter,rl indicates that adsorption of reactive blue 19 onto activated carbon is favorable for all the concentrations studied. thermodynamics parameters,δgads,δh ads,δsads have also been calculated from the slope and intercept of the plot of ln kd vs. 1/t. the thermodynamic parameters studied show that the adsorption of reactive blue 19 onto activated carbon is endothermic.