Journal
3RD INTERNATIONAL SEMINAR ON CHEMISTRY 2014
Volume 17, Issue -, Pages 170-176Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.proche.2015.12.109
Keywords
Cr(III); Cr(VI); cyclic voltammetry
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The chromium(VI) and chromium(III) depositionson thegold nanoparticles (AuNPs)-modified glassy carbon electrode (GCE) from aqueous solutions were studied by means of cyclic voltammetry technique. The deposition processes were investigated at +/- 25 degrees C. The anodic and cathodic scannings were recorded within the potential range of -500 to 1500 mV. The scan rate and multiple cycling were carried out to examine the behavior of the electroactive species on the electrode surface. The logarithmic of the plot between Ip and V reflected a diffusion controlled by the irreversible redox reaction of Cr(III) and an adsorption-driven process. These results strongly suggested that the irreversible redox reaction of Cr(VI) was controlled by the diffusion step.
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