A Novel Electrochemical Sensor for Simultaneous Determination of Hydroquinone,Catechol, and Resorcinol Using a Carbon Paste Electrode Modified by Zn-MOF,Nitrogen-doped Graphite,and AuNPs

In this work, the carbon paste electrode was modified with a composite of a metal-organic framework, nitrogen-doped graphite, and gold nanoparticles and used as an electrochemical sensor for dihydroxybenzene isomers. The morphology and characteristics of the modifiers were found by SEM and FT-IR. Electrochemical techniques showed the specific surface of the electrode to be significantly enhanced. The outcome achieved shows that this novel sensor displays an excellent electro-catalytic activity towards the oxidation of these isomers. The sensor was applied to the simultaneous determination of each three isomers using DPV with a linear response in the concentration range of 5–10⁵ nM.