Magnesium oxide nanoparticles (MgONP) have been synthesized and used to make a MgO/activated carbon nanocomposite which was used to remove atrazine (ATZ) from aqueous solutions. Fourier transform infrared (FTIR) spectroscopy, elemental analysis, and SEM were used to examine the synthesised MgO/activated carbon nanocomposite. The adsorption process was examined in batch mode employing a number of variables, including temperature, pH, ATZ concentration, agitation time, and adsorbent dosage. The conditions of 35 minutes of agitation, 0.1 g/L of adsorbent dose, pH 8, 323 K of temperature, and 10 mg/L of ATZ concentration were shown to be the most efficient adsorption method for removing ATZ. The experimental findings show that the highest adsorption capacity is 625.5 mg g-1, which is nearly equal to the estimated qe of 666.6 mg g-1