Chinese Journal of Applied Chemistry ›› 2020, Vol. 37 ›› Issue (10): 1195-1202.DOI: 10.11944/j.issn.1000-0518.2020.10.200048

• Full Papers • Previous Articles     Next Articles

Simultaneous Determination of Catechol and Hydroquinone by Copper Oxide Nanoparticles and Carbon Nanotubes Modified Glassy Carbon Electrode

CHANG Fengxia*, SHANG Zongyi, DONG Qing, LONG Zhiyan, DENG Yixue   

  1. College of Chemistry and Environmental Protection Engineering,Southwest Minzu University,Chengdu 610041,China
  • Received:2020-02-21 Published:2020-10-01 Online:2020-09-30
  • Contact: CHANG Fengxia, lecturer; Tel/Fax:028-85928021; E-mail:changfengxia@swun.edu.cn; Research interests:electrochemical sensing and rectification
  • Supported by:
    Supported by Southwest Minzu University Fundamental Research Funds for the Central Universities(No.2020NQN07)

Abstract: Copper oxide nanoparticles and carboxylated multi-walled carbon nanotubes were used as modification materials for glassy carbon electrodes in this study. This nanocomposite combined the advantages of electrochemical signal amplification and electrocatalysis, and the as-prepared modified electrode could separate the redox peaks of catechol and hydroquinone and enlarge the peak currents further. Thus, this electrochemical sensor based on copper oxide nanoparticles and carbon nanotubes can be used for the simultaneous determination of catechol and hydroquinone. The ratio of copper oxide nanoparticles and carbon nanotubes in the nanocomposite, the cast volume and pH of the electrolyte are optimized via cyclic voltammetry. The optimal mass ratio between copper oxide nanoparticles and carbon nanotubes is 5∶1. The optimal cast volume is 9 μL and phosphate buffer solution with pH=7.4 is used as the electrolyte. At the optimized conditions, the peak currents obtained with differential pulse voltammetric determination show good linear relationships with concentrations of catechol and hydroquinone in the range from 6.0×10-7~3.0×10-3 mol/L with detection limits of 1.0×10-7 mol/L and 1.60×10-7 mol/L (S/N=3), resepectively. This method is cheap, easy to operate and fast, and the recovery rates of practical water samples using this method are in a satisfactory range (94.6%~101.1%). Therefore, this proposed method has a good prospect of practical application.

Key words: copper oxide nanoparticles, carbon nanotubes, catechol, hydroquinone, simultaneous detection