Adsorption of atrazine (ATZ) from aqueous solutions by granular activated carbon (GAC) and carbon nanotubes (CNT) was studied in a batch-mode adsorption system at different initial concentrations of ATZ (1.030.0?mg?L1) and at three temperatures of 288, 296 and 304?K. The adsorption isotherms of Langmuir, Freundlich, PolanyiManes, and BrunauerEmmettTeller (modified) were used to model the process. The adsorption kinetics followed a pseudo-second-order kinetic model. The thermodynamic parameters ?H0, ?S0, and ?G0 of the adsorption were estimated. The thermodynamic parameters indicate that the adsorption process is spontaneous and exothermic.