An Electrochemical Sensor for Hydrazine Based on CoFe2O4 Nanoparticles:Toward Water Samples

Environmental pollution and food safety are currently a focus of considerations worldwide.Hydrazine is a highly carcinogenic substance and may cause water source contamination, owingto its wide-range applications involved with industrial process. For example, hydrazine canfunction as corrosion inhibitor, antioxidant, catalyst, reducing agent, photographic developer,rocket propellant, and is frequently used as the starting material for the synthesis of insecticides,explosives, dyestuffs and pharmaceuticals. However, it has adverse effect on health such as braindamage, DNA damage, and creation of blood abnormalities and irreversible deterioration ofnervous system. Therefore, humans exposed to hydrazine would bear severe health risk. In thisregard, detection of this poisonous substance is of practical importance [1]. Electrochemicalmethods are practical and attractive because electrochemical instrumentation is usually compact,relatively inexpensive, reliable and sensitive. It is known that at a bare electrode surface, theelectrochemical oxidation of hydrazine requires high-overpotential. To improve the detectionperformance, a variety of nanomaterials have attracted worldwide attention, such as carbonmaterials, metal nanoparticles, and metal oxides [2]. In particular, the magnetic nanoparticlesCoFe2O4 have attracted great attention due to large specific surface area, low toxicity, andmagnetic properties. Most importantly, it can be easily separated from the aqueous samples by anexternal magnetic field, and has a good auxiliary catalytic property [3]. In this work, we tried todevelop a specific sensor electrode for the determination of phenol by modifying GCE surfaceusing CoFe2O4 nanoparticles and (14E)-4-((E)-4-(2-hydroxybenzylideneamino)benzyl)-N-2-hydroxybenzylidenebenzenamine (see fig. 1). The hydrazine sensor, appeared to exhibit a good linear range of 1×10-6–7.4×10-3 M and a detection limit of (S/N=3) 1.7×10-7 M. The selectivity ofthe modified electrode for hydrazine was studied for a number of ions such as, Na+, Cl-, Ca+2,Mg+2, and SO4-2 and biomolecules such as glucose and ascorbic acid. Therefore, modifiedelectrode appears to be a good candidate for the oxidation and quantitative determination ofhydrazine.

کلیدواژه ها:

Hydrazine ، Glassy carbon electrode ، CoFe2O4 nanoparticles ، Surface modification