MoS2/MWCNT-COOH-Modified Glassy Carbon Electrode for Nitrite Detection in Water Environment

Nitrite is harmful to people and animals when it excessive in an environment. Traditional detection methods are time-consuming generally restricted by sensitivity. In this study, a simple efficient electrochemical sensor made of glassy carbon electrode (GCE), modified with MoS2 nanosheets/carboxylic multiwall nanotubes (MoS2/MWCNT-COOH), was used detect nitrite. Cyclic voltammetry (CV) for drawing the standard curve The properties materials were analyzed X-ray diffraction (XRD), photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), transmission (TEM), impedance (EIS). presents great response nitrite, shows wide sensing range (10–10,000 μM) low limit (3.6 μM). characterization nanomaterials indicates that MoS2/MWCNT-COOH has big surface area (150.3 m2 g−1) abundant pores (pore volume 0.7085 cm3 g−1). addition, high sensitivity (0.35 μA μM−1 cm−2), good reproducibility (RSD 2.2%), stability (the responding current only decreased about 4% after 2 weeks). Therefore, MoS2/MWCNT-COOH-modified potential analytical method nitrite determination.