Electrochemical Determination of Hydrogen Peroxide Using a Covalent Organic Framework (COF) and Amino-Modified Multi-Walled Carbon Nanotubes by Differential Pulse Voltammetry (DPV)

Hydrogen peroxide (H₂O₂) is widely used in the food industry as a bactericide due to its strong oxidizing ability. However, excess H₂O₂ in food can lead to chronic diseases, making it necessary to develop a rapid monitoring method. An electrochemical electrode based upon a glassy carbon electrode (GCE) modified with combined covalent organic framework (COF) and amino-modified multi-walled carbon nanotubes (MWNT-NH₂) has been developed. The modifier was prepared by assembling the COF onto the surface of MWNT-NH₂. Under optimal conditions, the performance of the modified electrode was evaluated by differential pulse voltammetry (DPV) with a linear range from 20 to 140 μM and a detection limit of 0.14 μM. In addition, the modified electrode had good stability and reproducibility. Good selectivity in presence of potential interferences and the successful application for the determination H₂O₂ in environmental water and chicken feet suggest its potential for practical analysis.