Mn-Fe3O4 nanoparticles anchored on the urushiol functionalized 3D-graphene for the electrochemical detection of 4-nitrophenol

Abstract

Preparation of highly active and cost-effective electrode materials is of great interest in electrochemical detection. In this study, a simple urushiol-templated solvothermal method combined with calcination was proposed to fabricate N-doped three-dimensional graphene (3D-G) with Mn-doped Fe₃O₄ nanoparticles loaded on the surface (Mn-Fe₃O₄/3D-G). Because of the large active surface area, porous channel and high loading ratio of Mn-Fe₃O₄ nanoparticles, as-prepared Mn-Fe₃O₄/3D-G sensor showed high activity on the determination of 4-nitrophenol (4-NP), which are much improved from the control un-modified samples. The wide linear concentration range (5-100 μM), low detection limit (19 nM) and satisfactory recovery of 4-NP in various water samples (98.38-100.41%) indicated that the Mn-Fe₃O₄/3D-G electrode can be potentially used for real-world applications. This study gives a simple but meaningful strategy for constructing transition metal oxide/graphene composite materials with high electrocatalytic activity.

Keywords: 4-nitrophenol; Electrochemical detection; Nanoparticles; Three-dimensional graphene; Urushiol.