An Amperometric Nitrobenzene Electrochemical Sensor Based on Electrochemically Activated Graphite Modified Screen Printed Carbon Electrode

摘要

In the present study involves the fabrication of amperometric sensor for the detection of nitrobenzene(NB) using electrochemically activated graphite (EAG) modified screen printed carbon electrode(SPCE). The EAG modified SPCE was prepared by a simple electrochemical activation of graphite inPBS containing KCl solution at an applied potential of 2.0 V for 300 s. The EAG modified SPCEshowed a good electrocatalytic reduction behavior towards NB with a lower overpotential than that ofother modified SPCEs. Amperometric results reveals that the reduction peak current of NB was linearover the concentrations from 0.3 to 374.5 M. The response time of the sensor was calculated as 5 s. The sensitivity was found as 1.445 AM cm with the detection limit of 0.06 M for NB. Inaddition, the fabricated electrode showed a good selectivity for NB in the presence of nitroaromaticand phenolic compounds with good operational stability.