Construction of Titanium Oxide Nanoparticle/Poly Alizarin Yellow R/Chitosan Nanocomposite: Application to Enhance Electrochemical Determination of Environmentally Pollutant Hydrazine

Hydrazine is a colorless flammable liquid with an ammonia-like odour. Hydrazine is highly toxic and dangerously unstable. In this study, a novel electrochemical sensor was proposed for detection of hydrazine on glassy carbon electrode (GCE). The electrochemical sensor is based on immobilizing titanium dioxide nanoparticle/alizarin yellow R/ Chitosan (TiO2 NPs/AYR/chit) nanocomposite. The deposited nanocomposite on the GCE was characterized by scanning electron microscopy (SEM). Then its electrocatalytical activity were investigated by CV and amperometry methods. Tests show that TiO2 NPs/AYR/chit exhibited enhanced catalytic activity towards hydrazine oxidation under optimal conditions. The results show the linear dependence of electrocatalytic response current of the sensor with the hydrazine concentration in the ranges of 5 to 580 μM, with a limit of detection and sensitivity of 3 μM and 0.1727 μA/μM, respectively. The modified GCE show many advantages relative to previously reported hydrazine biosensors such as facile preparation, highly sensitive and good catalytic properties at pH 12