Square wave voltammetric determination of Hg(II) using thiol functionalized chitosan-multiwalled carbon nanotubes nanocomposite film electrode
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Covalent tethering of cysteamine to chitosan using glutaraldehyde yields thiol-functionalized chitosan (CS-SH). It was cast on a glassy carbon electrode which is found to be very stable in acidic solutions and to possess a strong affinity for Hg(II) ions as confirmed by quartz crystal microbalance measurements. A glassy carbon electrode modified with a nanocomposite made from CS-SH and multiwalled carbon nanotubes was applied for square wave voltammetric determination of Hg(II). The procedure comprises the steps of (a) chemical accumulation of Hg(II) under open-circuit condition and (b) electrochemical determination of Hg(II). Linear responses are obtained in the range from 10 to 140 nM, with a limit of detection of 3 nM (S/N = 3) under optimized conditions. The electrode was applied to the determination of Hg(II) in water samples with satisfactory recoveries.
KeywordsThiol functionalized chitosan Multiwalled carbon nanotubes Hg(II) Square wave stripping voltammetry
This work was supported by the National Natural Science Foundation of China (20675029, 90713018, 20335020), the State Special Scientific Project on Water Treatment (2009ZX07212-001-06), the Foundation of the Hunan Provincial Education Department (05K009), and the State Key Laboratory of Electroanalytical Chemistry. W. Deng and Y. Tan contributed equally to this work.
- 23.Deng W, Tan Y, Fang Z, Xie Q, Li Y, Liang X, Yao S (2009) ABTS-multiwalled carbon nanotubes nanocomposite/Bi film electrode for the sensitive determination of Cd and Pb by differential pulse stripping voltammetry. Electroanalysis 21:2477Google Scholar