Removal of Thiram from Aqueous Solutions

In this study activated carbon was used for the removal of thiram from aqueous solutions. Adsorption experiments were carried out as a function of time, initial thiram concentration and temperature. Equilibrium data fitted well to the Freundlich and Langmuir equilibrium models in the studied concentration range. Adsorption kinetics followed a pseudo second-order kinetic model rather than pseudo first-order model. The results from kinetic experiments were used to describe the adsorption mechanism. Both boundary layer and intraparticle diffusion played important role in the adsorption mechanism of thiram. Thermodynamic parameters (Delta G(0), Delta H-0, and Delta S-0) were determined and the adsorption process was found to be an endothermic one. The negative values of Delta G(0) at different temperatures were indicative of the spontaneity of the adsorption process.