Mesoporous CoOx/C Nanocomposites Functionalized Electrochemical Sensor for Rapid and Continuous Detection of Nitrite

Nitrite is widespread in the environment, and frequently used as an additive to extend shelf life of meat products. However, excess intake nitrite can be harmful human health. Hence, it very important know control content foodstuffs. In this work, by means self-assembly induced solvent evaporation, we amphiphilic PEO-b-PS diblock copolymers resol cobalt nitrate a template synthesize ordered mesoporous CoOx/C nanocomposites. Then, nanocomposites were modified on glassy carbon electrode (GCE), which showed excellent sensitivity, good selectivity, wide detection range for nitrite. Through cyclic voltammetry current–time techniques, electrochemical performance GCE with was analyzed. Under optimized conditions, found that anodic currents linearly related concentrations regression equation lp (µA) = 0.36388 + 0.01616C (R2 0.9987) from 0.2 µM 2500 µM, limit 0.05 µM. Furthermore, sensor behaved high reproducibility anti-interference ability towards various organic inorganic ions, such NO3−, SO42−, Cl−, COOH− (Ac−), Na+, K+, Mg2+, NH4+. Our results indicated these could applied sensors rapid sensitive food preservative