The Cu-MOF-199/single-walled carbon nanotubes modified electrode for simultaneous determination of hydroquinone and catechol with extended linear ranges and lower detection limits

Jian Zhou; Xi Li; Linlin Yang; Songlin Yan; Mengmeng Wang; Dan Cheng; Qi Chen; Yulin Dong; Peng Liu; Weiquan Cai; Chaocan Zhang

doi:10.1016/j.aca.2015.09.054

The Cu-MOF-199/single-walled carbon nanotubes modified electrode for simultaneous determination of hydroquinone and catechol with extended linear ranges and lower detection limits

Anal Chim Acta. 2015 Oct 29:899:57-65. doi: 10.1016/j.aca.2015.09.054. Epub 2015 Oct 8.

Authors

Jian Zhou¹, Xi Li², Linlin Yang¹, Songlin Yan¹, Mengmeng Wang¹, Dan Cheng¹, Qi Chen¹, Yulin Dong¹, Peng Liu¹, Weiquan Cai¹, Chaocan Zhang³

Affiliations

¹ School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan 430070, PR China.
² School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan 430070, PR China. Electronic address: chemlixi@whut.edu.cn.
³ School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, PR China. Electronic address: polymers@whut.edu.cn.

PMID: 26547493
DOI: 10.1016/j.aca.2015.09.054

Abstract

A novel electrochemical sensor based on Cu-MOF-199 [Cu-MOF-199 = Cu3(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 μmol L(-1) (RHQ = 0.9999) for HQ and 0.1-1150 μmol L(-1) (RCT = 0.9990) for CT. The detection limits for HQ and CT were as low as 0.08 and 0.1 μmol 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.

Keywords: Catechol; Cu-MOF-199; Electrocatalysis; Hydroquinone; Simultaneous determination; Single-walled carbon nanotubes.