Journal
ANALYTICA CHIMICA ACTA
Volume 899, Issue -, Pages 57-65Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2015.09.054
Keywords
Cu-MOF-199; Single-walled carbon nanotubes; Hydroquinone; Catechol; Simultaneous determination; Electrocatalysis
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Funding
- National Natural Science Foundation of China [51273155, 21476179, 51272201]
- Fundamental Research Funds for the Central Universities [2014-Ia-030]
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A novel electrochemical sensor based on Cu-MOF-199 [Cu-MOF-199 = Cu-3(BTC)(2) (BTC = 1,3,5-benzenetricarboxylicacid)] and SWCNTs (single-walled carbon nanotubes) was fabricated for the simultaneous determination of hydroquinone (HQ) and catechol (CT). The modification procedure was carried out through casting SWCNTs on the bare glassy carbon electrode (GCE) and followed by the electrodeposition of Cu-MOF-199 on the SWCNTs modified electrode. Cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM) were performed to characterize the electrochemical performance and surface characteristics of the as-prepared sensor. The composite electrode exhibited an excellent electrocatalytic activity with increased electrochemical signals towards the oxidation of HQ and CT, owing to the synergistic effect of SWCNTs and Cu-MOF-199. Under the optimized condition, the linear response range were from 0.1 to 1453 mu mol L-1 (R-HQ = 0.9999) for HQ and 0.1-1150 mu mol L-1 (R-CT = 0.9990) for CT. The detection limits for HQ and CT were as low as 0.08 and 0.1 mu mol L-1, respectively. Moreover, the modified electrode presented the good reproducibility and the excellent anti-interference performance. The analytical performance of the developed sensor for the simultaneous detection of HQ and CT had been evaluated in practical samples with satisfying results. (C) 2015 Elsevier B.V. All rights reserved.
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