Abstract
ABSTRACT The present research <is conducted to develop a potent electrochemical sensor made of silver adsorbed on chitosan modified carbon paste (CS@Ag/CPE) for electrocatalytic reduction of p-nitroaniline (p-NA). The prepared electrode CS@Ag/CPE is characterized using different techniques including cyclic voltammetry (CV), Scanning electron microscopy, X-Ray diffraction analysis, Chronoamperometry and Electrochemical impedance spectroscopy (EIS). Electrochemical characterization demonstrates that the CS@Ag/CPE had excellent electrocatalytic activity, good electrical properties, and high active surface area. As compared with the unmodified carbon paste electrode, the modified electrode favours the reduction of p-NA and greatly enhances the peak current. Under the optimized condition, p-NA could be quantified within the range from 10.0 nM – 1.0 mM with a low detection limit of 7.87 nM according to (S/N = 3). The analytical performance of the developed sensor regards the detection of p-NA had been evaluated in practical samples including wastewater with satisfying results.
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