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Highly Sensitive and Simultaneous Detection of Hydroquinone and Catechol Using Poly(mercaptoacetic acid)/Exfoliated Graphene Composite Film‐modified Electrode
Author(s) -
Fu Ju,
Tan Xiaohong,
Shi Zhen,
Song Xinjian,
Zhang Shenghui
Publication year - 2016
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201500535
Subject(s) - hydroquinone , graphene , catechol , electrochemistry , exfoliation joint , nuclear chemistry , electrode , graphite , detection limit , materials science , electrochemical gas sensor , solvent , inorganic chemistry , chemistry , organic chemistry , nanotechnology , chromatography
Graphene nanosheets were facilely prepared through one‐step liquid‐phase exfoliation of graphite powder in N , N ‐dimethylformamide (DMF) with the assistance of sodium citrate, and then employed to modify the surface of glassy carbon electrode (GCE) via solvent evaporation. Subsequently, mercaptoacetic acid (MA) was electrodeposited onto the surface of exfoliated graphene‐modified GCE (EG/GCE) to construct a composite film‐modified electrode ( p MA/EG/GCE). The electrochemical behaviors of hydroquinone (HQ) and catechol (CC) were studied. It was found that the oxidation peak currents of HQ and CC increased obviously on the surface of EG/GCE and p MA/GCE, compared with those on bare GCE. However, the oxidation signals of HQ and CC further enhanced greatly on the surface of p MA/EG/GCE, showing strong synergetic enhancement effects. As a result, a highly sensitive electrochemical method was developed for the simultaneous determination of HQ and CC. The linear range was from 0.1 to 100 μmol L −1 , and the detection limits were 85 and 80 nmol L −1 for HQ and CC (S/N=3).