Electrocatalytic determination of hydrazine and phenol using a carbon paste electrode modified with ionic liquids and nano composites

Hydrazine is highly toxic and easily absorbed by oral, breathing routes of exposure or even introduced to the skin, which mostly affect the lungs, kidney, liver and central nervous system ofliving organisms. Another important kind of pollutant is phenol, also known as carbolic acid, and widely exists in water, canned food, atmosphere and chemical productions [1]. As is well-known, nanostructure materials can decrease the overpotential of the redox process ofelectroactive species due to their large surface to volume ratio. Nanocomposite materials as a subclass of nanostructure materials have been used to fabricate a new type of chemically modified electrodes (CMEs) with rapid electron transfer kinetic [2]. In this work, a carbon paste electrode was modified with 2-(4-Oxo-3-phenyl-3,4-dihydroquinazolinyl)-N′-phenyl-hydrazinecarbothioamide, magnetic core–shell Fe3O4@SiO2/MWCNT nanocomposite and ionic liquid (n-hexyl-3-methylimidazolium hexafluoro phosphate). Square wave voltammetry (SWV) exhibits a linear dynamic range from7.0×10-8 to 5.0×10−4 M and a detection limit of 40.0 nM for hydrazine. The prepared modified electrode exhibits a very good resolution between the voltammetric peaks of hydrazine and phenol that makes it suitable for the detection of hydrazine in the presence of phenol in real samples.

کلیدواژه ها:

Hydrazine ، Phenol ، Fe3O4@SiO2/MWCNT nanocomposite ، Ionic liquids ، Modified electrodes