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Sensors 2013, 13(5), 6204-6216;

A Graphene-Based Electrochemical Sensor for Rapid Determination of Phenols in Water

School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China
Guangdong Province Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, China
Author to whom correspondence should be addressed.
Received: 26 March 2013 / Revised: 28 April 2013 / Accepted: 8 May 2013 / Published: 13 May 2013
(This article belongs to the Section Chemical Sensors)
Full-Text   |   PDF [843 KB, uploaded 21 June 2014]


A glassy carbon electrode (GCE) coated with a graphene/polymer film was fabricated for rapid determination of phenols in aqueous solutions. The electrochemical behavior of different phenols at the graphene/polymer-coated GCE was also investigated. In PBS buffer solution with a pH of 6.5, hydroquinone exhibits a well-defined reduction peak at the modified GCE. Based on this, an electrochemical method for the direct determination of phenols is proposed. Investigating different parameters revealed the optimized detection conditions for the electrode are a scan rate of 50 mV/s, dosage of graphene-polyaniline of 8 μL, dosage of tyrosinase of 3 μL, and pH of 6.5. Under the optimal conditions, the reduction peak current varies linearly with the concentration of phenols, with a linear regression equation of I (10−6A) = −4.887 × 10−4C (mol/L)−5.331 × 10−6 with a correlation coefficient of 0.9963 and limit of detection (S/N = 3) of 2.00 × 10−4 mol/L. The electrochemical sensor is also used to detect phenols in actual samples, where it shows great promise for rapid, simple and quantitative detection of phenols. View Full-Text
Keywords: graphene-polyaniline electrode; electrochemical reduction; hydroquinone; phenols graphene-polyaniline electrode; electrochemical reduction; hydroquinone; phenols
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Chen, K.; Zhang, Z.-L.; Liang, Y.-M.; Liu, W. A Graphene-Based Electrochemical Sensor for Rapid Determination of Phenols in Water. Sensors 2013, 13, 6204-6216.

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