Journal
ELECTROCHIMICA ACTA
Volume 55, Issue 23, Pages 7102-7108Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2010.06.072
Keywords
Graphene; 4-Aminophenol; Electrochemical oxidation; Kinetic parameter; Determination
Categories
Funding
- National Natural Science Foundation of China [20775044]
- Natural Science Foundation of Shandong province, China [Y2006B20]
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The graphene-chitosan composite film modified glassy carbon electrode (GCE) was fabricated and used to determine 4-aminophenol (4-AP). In 0.1 M pH 6.3 phosphate buffer solution, the redox peak currents of 4-AP increased significantly and the peak-to-peak separation decreased greatly at graphene-chitosan composite film modified GCE compared with bare GCE and chitosan modified GCE, indicating that graphene possessed electrocatalytic activity towards 4-AP. The experimental conditions were optimized and the kinetic parameters were investigated. The oxidation mechanism was discussed. Under the optimal experimental conditions, the oxidation peak current was proportional to 4-AP concentration in the range from 0.2 to 550 mu M with the correlation coefficient of 0.9930. The detection limit was 0.057 mu M (S/N = 3). Using the proposed method, 4-AP was successfully determined in water samples and paracetamol tablets with standard addition method, suggesting that this method can be applied to determine 4-AP in environments and pharmaceuticals. (C) 2010 Elsevier Ltd. All rights reserved.
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