| Summary: |
The adsorption of diuron and carbofuran from aqueous solutions onto granular activated carbon in a batch system for initial pesticide concentrations in the range of 10-40 mg·L-1, with different pHs (3.0, 5.0 and 7.0) and temperatures (20-40 °C), was studied. The adsorption equilibrium was described by the Langmuir and Freundlich models. Adsorption capacity is affected by the initial pesticide concentration, pH and temperature as the experimental results show. An increase in pH results in a significant increase of adsorption capacity. The adsorption kinetics for both pesticides have been experimentally established. Pseu-do-first and pseudo-second order kinetic models were used to describe the experimental data, and the rate constants were evaluated. |