Abstract
AbstractFinding the synergistic electrochemical effect of cuprous oxide nanoparticle (CuO‐NP), Ag‐nanoparticle (Ag‐NP) on graphene oxide (GO) encouraged us to provide a novel modified glassy carbon electrode (GCE) for the determination of the herbicide paraquat (PQ) in solution. The necessary compounds were prepared by simple methods and characterized by scanning electronic microscopy, UV/Vis spectroscopy, and electrochemical impedance spectroscopy. The sensor showed good electrocatalytic activity toward the reduction of PQ. The cyclic voltammetric and DPV results showed that the oxidation and reduction processes of PQ are reversible and the Ag‐GO/CuO composition had good electrocatalytic performances in the determination of PQ. The responses of the electrochemical Ag‐GO/CuO/GCE were investigated for pH, type of supporting electrolyte, scan rate, and the response reproducibility of the system. Under the optimized conditions, a linear response over the concentration range of 0.40–650.0 μM of PQ was observed with a correlation coefficient (R2) of 0.999 and a detection limit of 0.07 μM. Reasonable recoveries between 99.2 and 105.0% were obtained for river water PQ content.
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