Simultaneous Determination of Heavy Metal Ions with GNs/6F-S-BI-PAEK Composite Film Modified Glassy Carbon Electrode

In this work, a novel GNs/6F-S-BI-PAEK composite film modified glassy carbon electrode (GCE) was fabricated for the simultaneous determination of heavy metals by using polymer 6F-S-BI-PAEK to disperse and functionalize graphene oxide nanosheets (GNs). The prepared GNs/6F-S-BI-PAEK composite film modified electrode was well characterized by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) techniques. The optimum modification and determination conditions were selected. Differential pulse voltammetry (DPV) experiments were performed for selective and sensitive determination of Co2+, Pb2+ , Cd2+ and Zn2+ . Linear responses in the range of 0.5-60 mu g/L were obtained with the detection limit of 0.5 mu g/L. The 6F-S-BI-PAEK polymer film capsuling on the surface of GNS not only effectively prevented the agglomeration between the GNS, but also promoted to form a quite stable GNs/6F-S-BI-PAEK composite film on GCE. Moreover, the functionalized 6F-S-BI-PAEK film could be used to adsorb and enrich heavy ions effectively. The GNs/6F-S-BI-PAEK/GCE showed good reproducibility, stability, and was successfully employed for the accurate determination of C & oacute;(2+), Pb2+, Cd2+ and Zn2+ in spiked lake water samples with satisfactory recoveries.