Poly (propylene imine) Coated Gold Nanoparticles Sensor for Cd (II) in Water

Abstract

The application of gold and dendrimer (poly (propylene imine)) nanoparticles coated glassy carbon electrode (GCE-AuNPs/PPI) in the electrochemical determination of cadmium ion in water is presented. Gold and dendrimer nanoparticles were co-electrodeposited on the exterior of GCE using cyclic voltammetry (CV) at a potential range of -400 mV to 1100 mV for ten cycles. The modification of GCE with gold and dendrimer nanoparticles enhanced the redox current of [Fe(CN)6]3-/4- when compared to results obtained from bare GCE. Cd(II)detection was accomplished using square wave anodic stripping voltammetry (SWASV) at the adjusted conditions: pH 1, deposition potential of -0.200 mV, pre-concentration time of 180s and 0.1 M HCl as supporting electrolyte. The GCE-AuNPs/PPI electrode detected Cd(II)to the limit of 0.34 ppb and was not susceptible to many interfering cations except Pb2+, Hg2+ and As3+. The GCE-AuNPs/PPI was practical for the quantitative assessment of Cd(II) in environmental water sample. The results obtained were in concord with Inductively Coupled Plasma-Optical Emission Spectroscopy procedure, thus validating the reported method.