Journal
MICROCHIMICA ACTA
Volume 181, Issue 11-12, Pages 1369-1377Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-014-1271-0
Keywords
Electrochemical sensor; beta-cyclodextrin; Graphene oxide; Carbon nanotubes; 1,3-dinitrobenzene
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Funding
- National Natural Science Foundation of China [21,171,174]
- Provincial Natural Science Foundation of Hunan [09JJ3024, 13JJ3112]
- Scientific Research Project of Education Department of Hunan Province [12C0536, 13K105]
- Provincial Environmental Science and Technology Foundation of Hunan
- Opening Subject of State Key Laboratory of Powder Metallurgy
- Open-end Fund for the Valuable and Precision Instruments of Central South University
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We are presenting a host-guest electrochemical platform for sensing the pollutant 1,3-dinitrobenzene. The method is based on the use of a glassy carbon electrode (GCE) covered with a composite made from multiwalled carbon nanotubes and graphene oxide, and functionalized with beta-cyclodextrin (beta-CD). The resultant composite was characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis and electrochemical techniques. The modified GCE was used for the sensitive detection of 1,3-dinitrobenzene (DNB) at working voltages of -355 mV and -483 mV. Due to the specific recognition property of beta-CD and the excellent electronic properties of the carbon nanomaterials, the electrode exhibits outstanding supramolecular recognition and enhanced electrochemical response to DNB compared to more conventional electrodes. Under optimum conditions, the peak currents vary linearly with the DNB concentrations in the range from 0.02 to 30.0 mu M, and the detection limit is 5.0 nM (at an S/N of 3). The electrode exhibits long-term stability and has been successfully applied to the determination of DNB in spiked soil and water samples.
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