Abstract
Hydrophobic ionic liquid-functionalized SBA-15 modified carbon paste electrode (CPSPE) was fabricated, and its electrochemical performance was investigated by cyclic voltammetry, electrochemical impedance spectra, and chronocoulometry in K3Fe(CN)6/K4Fe(CN)6 solution. Compared with carbon paste electrode (CPE) and SBA-15 modified carbon paste electrode (CSPE), the electron transfer ability was in the sequence as: CPSPE>CSPE>CPE. Meanwhile, the electrocatalytic activity of CPSPE to catechol and hydroquinone was evaluated by cyclic voltammetry, and then, the linear concentration ranges were obtained by the amperometric detection from 2.0 × 10-5 to 3.2 × 10-4 M for catechol and 5.0 × 10-5 to 5.5 × 10-4 M for hydroquinone, with the detection limits of 5.0 × 10-7 and 6.0 × 10-7 M, respectively. The advantages of both ionic liquids and heterogeneous supports made CPSPE exhibit high electrocatalytic activity towards the redox of catechol and hydroquinone by significantly improving their reversibility and enhancing their peak currents. In addition, the present method was applied to the determination of catechol and hydroquinone in artificial wastewater sample, and the results were satisfactory.
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The authors appreciate the support from the National Natural Science Foundation of China (No. 50830303), Program for Changjiang Scholars and Innovative Research Team in University(No. IRT0853), and the Education Department Foundation of Shaanxi Province in China (No. 11JK0570).
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Dong, S., Zhang, P., Yang, Z. et al. Simultaneous determination of catechol and hydroquinone by carbon paste electrode modified with hydrophobic ionic liquid-functionalized SBA-15. J Solid State Electrochem 16, 3861–3868 (2012). https://doi.org/10.1007/s10008-012-1805-5
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DOI: https://doi.org/10.1007/s10008-012-1805-5