Electrochemical Probe of the Reduced Graphene Oxide Modified by Bare Gold Nanoparticles Functionalized Zr(IV)-based Metal-organic Framework for Detecting Nitrite

Widely presented nitrite in drinking water, food and even physiological system endangers human health. Here,bare gold nanoparticles functionalized Zr-based metal-organic framework modified reduced graphene oxide (GNPs/UiO-66-NH 2 /rGO) nanocomposites were prepared by hydrothermal method. This experiment studies the morphology, composition, structure and electrochemical behavior of the sensor. The experimental results show that the sensor has a peak potential of 0.9 V, the concentration range of NO 2 − is 5.0 μM to 768 μM, the linear regression equation of the calibration curve is I pa =0.3646+0.00642 C (R 2 =0.9998), and the LOD is as low as 3.7 μM (S/N=3). Therefore, an electrochemical sensor platform for trace detection of NO 2 − was successfully constructed.