razieh razavi

Agricultural pesticides are significant environmental pollutants that cause serious harm to humans and the ecosystem. Among these pesticides is abamectin, which is used as an acaricide. In this study, needle-like molybdenum trioxide (MoO₃) nanorods were synthesized via the hydrothermal method, and a molybdenum trioxide@graphene oxide (MoO₃@GO) nanocomposite was heterogeneously prepared for the removal of the pesticide abamectin. The synthesized nanoparticles were characterized using Xray diffraction (XRD), scanning electron microscopy (SEM), and infrared spectroscopy (IR). The average size of the MoO₃ nanorods was found to be 110 nm. The adsorption performance of these two materials for abamectin was compared. The results indicated that both adsorbents exhibit high adsorption capacity, with the MoO₃- graphene oxide nanocomposite showing superior adsorption. Key variables such as pesticide concentration, adsorbent dosage, contact time, and pH were investigated. The results demonstrated that the adsorption capacity of MoO₃ nanorods was 95%, while that of the synthesized nanocomposite reached 98%. The adsorption process followed the Langmuir isotherm model. The optimal adsorption conditions were determined as follows: adsorbent dosage of 3 mg, pesticide concentration of 5 ppm, contact time of 15 minutes, and acidic pH.