title: 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.
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.
authors.affiliation: School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan 430070, PR China.
authors.forename: Jian
authors.initials: J
authors.lastname: Zhou
authors.affiliation: School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan 430070, PR China. Electronic address: chemlixi@whut.edu.cn.
authors.forename: Xi
authors.initials: X
authors.lastname: Li
authors.affiliation: School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan 430070, PR China.
authors.forename: Linlin
authors.initials: L
authors.lastname: Yang
authors.affiliation: School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan 430070, PR China.
authors.forename: Songlin
authors.initials: S
authors.lastname: Yan
authors.affiliation: School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan 430070, PR China.
authors.forename: Mengmeng
authors.initials: M
authors.lastname: Wang
authors.affiliation: School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan 430070, PR China.
authors.forename: Dan
authors.initials: D
authors.lastname: Cheng
authors.affiliation: School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan 430070, PR China.
authors.forename: Qi
authors.initials: Q
authors.lastname: Chen
authors.affiliation: School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan 430070, PR China.
authors.forename: Yulin
authors.initials: Y
authors.lastname: Dong
authors.affiliation: School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan 430070, PR China.
authors.forename: Peng
authors.initials: P
authors.lastname: Liu
authors.affiliation: School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan 430070, PR China.
authors.forename: Weiquan
authors.initials: W
authors.lastname: Cai
authors.affiliation: School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, PR China. Electronic address: polymers@whut.edu.cn.
authors.forename: Chaocan
authors.initials: C
authors.lastname: Zhang
keywords: Catechol; Cu-MOF-199; Electrocatalysis; Hydroquinone; Simultaneous determination; Single-walled carbon nanotubes