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电化学(中英文) ›› 2019, Vol. 25 ›› Issue (4): 504-510.  doi: 10.13208/j.electrochem.180423

• 研究论文 • 上一篇    下一篇

二氧化钛纳米颗粒/还原氧化石墨烯修饰玻碳电极在对硝基苯酚检测中的应用

 酒琳娜,程永强*   

  1.  (太原理工大学信息与计算机学院微纳系统研究中心,教育部新型传感器与智能控制系统重点实验室, 山西 晋中 030600)
  • 收稿日期:2018-04-23 修回日期:2018-06-12 出版日期:2019-08-28 发布日期:2019-08-28
  • 基金资助:
     国家自然科学基金项目(No. 61471255,No. 51622507,No. 61474079,No. 61703298,No. 51705354)和山西青年基础研究项目(No. 201701D221110,No. 2015021092)资助

Electrochemical Detection of 4-Nitrophenol Based on Glassy Carbon Electrode Modified by TiO2NPs/RGO Composite

 JIU Lin-na, CHENG Yong-qiang*   

  1.  (MicroNano System Research Center, Key Lab of Advanced Transducers and Intelligent Control System of  the Ministry of Education & College of Information and Computer, Taiyuan University of Technology, Jinzhong 030600, China)
  • Received:2018-04-23 Revised:2018-06-12 Published:2019-08-28 Online:2019-08-28
  • Supported by:
     

摘要:

本文报道了用二氧化钛纳米颗粒(TiO2NPs)/还原氧化石墨烯(RGO)的复合物修饰玻碳电极检测微量对硝基苯酚(4-NP)的电化学方法. 本研究用扫描电子显微镜(SEM)对该复合材料形貌进行表征,用循环伏安法和交流阻抗谱对该复合物电极的电化学性能进行检测,表现出良好的电化学特性,采用差分脉冲伏安法对4-NP进行微量检测,结果令人满意,这主要得益于TiO2NPs/RGO复合物对4-NP有较高的催化活性,其电流峰值与浓度呈较高的线性关系,DPV的检测范围为10 μmol·L-1 ~ 350 μmol·L-1,检测限为0.13 μmol·L-1. 与其他报道的一些电化学传感器相比,该传感器检测范围大,检测限低,且工作稳定,成本低,分析简单快速,具有很好的应用前景.

 

关键词: 二氧化钛纳米颗粒, 还原氧化石墨烯, 对硝基苯酚, 差分脉冲伏安法

Abstract:

 4-nitrophenol (4-NP) has become factitious pollution, and presented a serious threat to the nature and human health. It is necessary to develop a convenient and fast detection method. In this work, the glassy carbon electrode modified by titanium dioxide nanoparticles (TiO2NPs)/reduced graphene oxide (RGO) composite as an electrochemical sensor was studied for the trace detection of 4-NP. The morphology of the composite was characterized by scanning electron microscopy (SEM). The homogeneous mixing of titanium dioxide nanoparticles and reduced graphene oxide increased the specific surface area of the composite, and facilitated the electrochemical reaction of 4-NP. The electrochemical characteristics of the composite electrode were analyzed by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) in the solution of 5 mmol·L-1 [Fe(CN)6]3-/4-, showing excellent electrochemical performance. In 0.067 mol·L-1 phosphate buffer solution with a pH of 6.0, differential pulse voltammetry was used to detect trace amounts of 4-NP. This method was satisfactory for the determination of 4-NP due mainly to the higher catalytic activity of TiO2NPs/RGO complexes for 4-NP. The current peak value and concentration of 4-NP showed a good linear relationship. The detection range was 10  μmol·L-1 ~ 350  μmol·L-1 and the detection limit was 0.13  μmol·L-1. Interferences of other pollution compounds, such as 2-nitrophenol, did not impact the sensing to 4-NP. In addition, the electrochemical sensor exhibited excellent repeatability and stability (The TiO2NPs/RGO/GCE electrodes retained 90.2% of the initial response current after two weeks). Compared with some other electrochemical sensors reported, this sensor had the advantages of a large detection range, low detection limit, stable operation, repeatable test, low cost, simple and rapid analysis, and based on these characteristics, the TiO2NPs/RGO/GCE electrochemical sensor can provide an efficient detection for 4-NP.

Key words: TiO2NPs, RGO, 4-nitrophenol, differential pulse voltammetry

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