Preparation and electrochemical properties of functionalized ionic liquid self-assembled modified graphite electrode |
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Authors: | Changli Zhou Yuxin Zheng Zhiying Li Zhen Liu Yanmin Dong Xin Zhang |
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Affiliation: | aCollege of Chemistry and Chemical Engineering, University of Jinan, Shandong, Jinan 250022, China |
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Abstract: | A modified graphite electrode with functionalized ionic liquid (IL) pyridinium derivative of β-cyclodextrin ([CDbPy]BF4) was prepared by layer-by-layer self-assembly technique. With ferrocene as probe, the characterization of the (CDIL/PDDA)n/GE SAMs in the solution of phosphate (PBS, pH 7.0) was investigated by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and chronocoulometry. The electrochemical behavior of p-chloronitrobenzene (p-CNB) at the modified electrode was studied. It was found that the modified electrode could catalyze the reduction of p-CNB and made the cathode peak move about 100 mV in positive direction in the solution of 0.1 mol/L PBS (pH 7.0). Differential pulse voltammetry (DPV) was applied to the determination of p-CNB in waste water with satisfactory results. The detection limit and the linear range of the concentration of p-CNB to the reduction peak current were 8.0 × 10−8 mol/L and 3.0 × 10−7–1.0 × 10−5 mol/L, respectively. |
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Keywords: | Modified electrode Layer-by-layer self-assembly Ionic liquid p-Chloronitrobenzene |
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