Electrochemical sensor based on Ce-MOF/carbon nanotube composite for the simultaneous discrimination of hydroquinone and catechol

Haiping Huang; Yanan Chen; Zhongzhen Chen; Jinglin Chen; Yongmei Hu; Jun-Jie Zhu

doi:10.1016/j.jhazmat.2021.125895

Electrochemical sensor based on Ce-MOF/carbon nanotube composite for the simultaneous discrimination of hydroquinone and catechol

J Hazard Mater. 2021 Aug 15:416:125895. doi: 10.1016/j.jhazmat.2021.125895. Epub 2021 Apr 20.

Authors

Haiping Huang¹, Yanan Chen², Zhongzhen Chen², Jinglin Chen², Yongmei Hu², Jun-Jie Zhu³

Affiliations

¹ School of Chemistry and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, PR China. Electronic address: huanghp@jxust.edu.cn.
² School of Chemistry and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, PR China.
³ State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, PR China. Electronic address: jjzhu@nju.edu.cn.

PMID: 34492833
DOI: 10.1016/j.jhazmat.2021.125895

Abstract

Ce-MOF/CNTs nanocomposites were prepared by a simple method and post-treated with NaOH/H₂O₂ mixed solution. The morphology and structure of the treated samples were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The results show that the post treatment induces the Ce-MOF morphological changing from rod-like structure into particles, which are covered on the surface of CNTs. XPS demonstrates that there are two-valence (TV) of Ce³⁺/Ce⁴⁺ in the post-treated Ce-MOF/CNTs (TV) composite. The electrochemical behaviors of nanocomposite were also investigated on electrochemical work station. By utilization of the good electrical conductivity of CNT, the two-valence of Ce and the high surface area of MOF, the nanocomposites were used to fabricate the electrochemical sensor for the simultaneous electrochemical detection of hydroquinone (HQ) and catechol (CC). Compared to the Ce-MOF/CNTs/GCE, the post-treated Ce-MOF (TV)/CNTs/GCE exhibited two well-defined peaks for the electrochemical oxidation of HQ and CC. The linear ranges responding to HQ and CC are 10~100 μM and 5~50 μM respectively.

Keywords: Carbon nanotube; Catechol; Ce-MOF; Electrochemical sensor; Hydroquinone.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Catechols
Electrochemical Techniques
Hydrogen Peroxide
Hydroquinones
Nanocomposites*
Nanotubes, Carbon*

Substances

Catechols
Hydroquinones
Nanotubes, Carbon
Hydrogen Peroxide