Functionalization of Graphene Nanosheets with 4-Amino Benzoic Acid and its Application in Pb2+ Sensing

Herein, reduced graphene oxide (RGO) was functionalized with benzoic acid via using the diazonium grafting route to produced benzoic acid functionalized graphene (BFG). The prepared RGO and BFG were characterized by XRD, FT-IR, TEM, AFM and electrochemical methods.Then a carbon paste electrode was modified with BFG (CPE/BFG). The prepared modified electrode, electrochemically characterized in the presence of Fe(CN)6]3−/4− as a redox probe.Sensing ability of the modified electrode toward two valet cations was evaluated by following striping voltammetry responses of pre-concentrated ions on top of the CPE/BFG. The CPE/BFG electrode showed selective response to Pb2+ ion. Consequently, the electrode response wasevaluated as a function of solution pH, pre-concentration time, and ion concentrations. Finally, inoptimized conditions, a linear ranges from1.0 × 10−9 to 1.0 × 10−3 M Pb2+ was observed. The obtained results will be presented and described here.

کلیدواژه ها:

Graphene ، Surface functionalization ، Modified electrode ، Pb2+ detection