Graphdiyne oxides as new modifier for the simultaneous electrochemical detection of phenolic compounds

Graphdiyne (GDY) is a newtwo-dimensional carbon nanomaterial with rich carbon chemical bonds, large conjugation system, porous structure and excellent chemical catalytic properties. In this work, graphdiyne oxide (GDYO), the oxidized form of GDY, was first used to establish a new platform for the simultaneously detection of hydroquinone (HQ), catechol (CC), resorcinol (RC) and p-nitrophenol (p-NP). The microstructure and morphologies of the materials and the surface of the modified electrode were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The electrocatalytic properties of graphene oxide (GO), GDY and GDYO for CC, HQ, RC and p-NP were investigated by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The results show that the GDYO modified glassy carbon electrode (GDYO/GCE) exhibited excellent catalytic activities towards CC, HQ, RC and p-NP. The linear ranges of HQ, CC, RC and p-NP were 1 mu M980 mu M, 0.6 mu M-692 mu M, 1 mu M-300 mu M and 0.6 mu M-203 mu M, 203 mu M-692 mu M with 0.3 mu M, 0.2 mu M, 0.3 mu M and 0.2 mu M, respectively. In addition, the electrochemical sensor showed good selectivity, sensitivity and stability. The application in real samples was also evaluated, and the recoveries suggesting that it could be used as an excellent potential material for the simultaneous determination of phenolic compounds in environmental samples. (C) 2020 Published by Elsevier B.V.