A Flow Injection Amperometric Sensor for Nitrate Detection Based on Cu Foam/Ordered Mesoporous Carbon Modified Glassy Carbon Electrode

Nitrate (NO3-) contamination from agricultural and industrial waste affects environmental water quality and can cause severe diseases if consumed in drinking water. Therefore, the detection of NO3- is a necessary precaution. This work describes the development of an electrochemical sensor for NO3- detection that combines the advantages of ordered mesoporous carbon (OMC) and copper foam (Cu foam) on a glassy carbon electrode (Cu foam/OMC/GCE). The large surface area, uniform pore structure, and large pore volume of OMC supported the electrodeposition of Cu foam to create a highly porous electrocatalytic structure for NO3- reduction. Under optimal conditions, the developed electrochemical sensor exhibited linearity from 1.0 mu M to 5.0 mM and a detection limit of 1.0 mu M (S/N=3). Moreover, the proposed electrochemical sensor exhibited acceptable selectivity, and good stability and reproducibility. The developed sensor detected NO3- in drinking water samples with recoveries of 88.2 +/- 0.9 to 112.5 +/- 6.3 %. An electrochemical sensor for nitrate detection was proposed based on a highly porous structure of Cu foam and ordered mesoporous carbon which exhibited good electrocatalytic activity towards nitrate reduction. Moreover, the developed sensor was coupled with a flow injection analysis system to achieve low sample use, high precision, and continuous analysis. image