Electrochemical Synthesisof Porous Nickel Oxide Film in Acidic Media: Application for para-Nitrophenol sensor fabrication

Para-nitro phenol is one of the most important nitro benzenes witch widely used in synthesis of different industrial compounds. It remains in soil, groundwater and air for a long time and has toxic effects and poses a threat to humans, animals and plants. In order to evaluate the safety of water and food resources, it is important to develop efficient, simple and reliable methods for the determination of trace amounts of p-nitro phenol.
In the preset work in order to determine the trace amount of para-nitro phenol, a very simple and sensitive sensor based on the in situ electro-synthesis of nickel oxide nanostructure on the surface of the glassy carbon (GC) electrode was fabricated. Electro-deposition in acidic media produces hydrogen bubble witch causing deposition of porous film of nickel oxide on the electrode surface. Cyclic voltammetry and electrochemical impedance spectroscopy were used for investigation of electro-deposited film.
Findings: Results showed that electro-deposited film has very good electrocatalytic properties for para-nitro phenol destruction. By modification of glassy carbon electrode surface with this nanostructure film, sensitive electrochemical sensor for determination of p-nitro phenol using cyclic voltammetry method was fabricated. Detection limit (signal/noise = 3), sensitivity and linear range of sensor were 40 nM, 0.3245 µA µm-1 and 40-750 µM, respectively.
Result showed that the sensor can be used for sensitive determination of para-nitro phenol.