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Abstract: This study reports a novel electrochemical sensor based on ion imprinted polypyrrole and reduced graphene oxide (PPy/rGO) composite for trace level determination of Cd(II) in water. The ion imprinted polymer (IIP) modified electrode (IIP/rGO/GCE) was fabricated with two steps. First, reduced graphene oxide (rGO) was electrodeposited on the surface of GCE by cyclic voltammetry (CV), and then IIP/rGO/GCE was obtained by electropolymerization of pyrrole and template Cd(II) on the surface of rGO and the imprinted template Cd(II) ions were removed by electrochemical method. The morphology of IIP/rGO/GCE was characterized by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Experimental conditions such as deposition time, pH, supporting electrolyte, accumulation time and potential were optimized for the sensor performance. Square wave anodic stripping voltammetry (SWASV) was applied for the determination of Cd(II). As expected, there is a significant difference in the Cd(II) stripping peak response between IIP/rGO/GCE and NIP/rGO/GCE. Under the optimized conditions, the sensor has a good linearity in the range from 1 to 100 μg/L. The limit of detection is 0.26 μg/L (S/N=3). From the experimental results, the sensor has superior stability, reproducibility and selectivity. The sensor has been successfully applied to the determination of trace level Cd(II) in spiked real water samples
Template and target information: cadmium ion, Cd(II)
Author keywords: Cd(II) determination, Ion Imprinted Polymer (IIP), PPy, rGO composite, Electrochemical sensor, Square wave anodic stripping voltammetry