An electrochemical sensor based on MOF-derived porous carbon/graphene composite for sensitive determination of...

A sensitive electrochemical sensor for the determination of carbendazim (CBZ) was developed with Ni-doping nanoporous carbon-graphene composite (G-Ni/C) as the electrode material. The combination of graphene and Ni-doping nanoporous carbon not only prevented the aggregation of graphene, but also improved electric conductivity and substantially enhanced the electro catalytic activity for CBZ sensing. The electrochemical characterization of G-Ni/C towards CBZ determination was conducted by cyclic voltammetry (CV) and differential pulse voltammetry (DPV) . The sensor based on G-Ni/C/GCE exhibits good electroanalytical activity towards the electro-oxidation of CBZ at the potential of + 0.6 V vs Ag/AgCl. Some key factors including sample pH, scan rates, accumulation potential, and accumulation time were investigated. The method offered a wide linear range of 0.04 to 10.0 µM with a detection limit of 8.9 nM. The obtained sensor was successfully employed for the determination of CBZ in pond water and juice samples with RSD < 5.7% and recoveries in the range 91.3-111%. In the present work, Ni-doping nanoporous carbon-graphene composite (G-Ni/C) was prepared by directly pyrolysis of GO/Ni-MOF. The electrochemical sensor based on G-Ni/C /GCE was applied for sensitive determination of carbendazim (CBZ) in pond water, peach, and lemon juices samples.