高等学校化学学报 ›› 2013, Vol. 34 ›› Issue (10): 2296.doi: 10.7503/cjcu20130483

• 分析化学 • 上一篇    下一篇

聚邻氨基苯硫酚/纳米金复合膜分子印迹传感器测定2, 4-二氯苯酚

张进, 王超英, 李小平, 牛延慧   

  1. 贵州师范学院化学与生命科学学院, 贵阳 550018
  • 收稿日期:2013-05-23 出版日期:2013-10-10 发布日期:2013-10-10
  • 作者简介:张进,男,博士,副教授,主要从事分子印迹识别与电化学传感技术方面的研究.E-mail:jzhang@gznc.edu.cn
  • 基金资助:

    贵州省科学技术基金(批准号:J20102120)和贵州省教育厅自然科学基金(批准号:2010054)资助.

Molecularly Imprinted Electrochemical Sensor for 2, 4-Dichlorophenol Based on Composite Film of o-Aminothiophenol and Au Nanoparticles

ZHANG Jin, WANG Chao-Ying, LI Xiao-Ping, NIU Yan-Hui   

  1. School of Chemistry and Life Science, Guizhou Normal College, Guiyang 550018, China
  • Received:2013-05-23 Online:2013-10-10 Published:2013-10-10

摘要:

在2,4-二氯苯酚(2,4-DCP)存在下, 在金电极表面自组装邻氨基苯硫酚(oATP)并电聚合oATP/金纳米粒子, 制得2,4-DCP印迹复合膜电化学传感器.采用循环伏安法和交流阻抗技术对传感器制备过程进行了表征, 以K3Fe(CN)6为探针, 间接对2,4-DCP进行定量分析.结果表明, 2,4-DCP在5.0×10-8~1.2×10-4 mol/L 浓度范围内与K3Fe(CN)6示差脉冲伏安曲线的峰电流呈线性关系(R2=0.9964), 检出限为1.5×10-8 mol/L(S/N=3).该印迹传感器可在几种氯代酚干扰下选择性测定2,4-DCP.利用该传感器对环境水样进行加标回收检测, 回收率为95.2%~109.3%.

关键词: 2,4-二氯苯酚, 分子印迹电化学传感器, 金纳米粒子复合物, 聚邻氨基苯硫酚, 自组装, 电聚合

Abstract:

A novel molecularly imprinted electrochemical sensor for 2,4-dichlorophenol(2,4-DCP) detection was fabricated on the surface of gold electrode by self-assembly of o-aminothiophenol(oATP) and electropolymerization of oATP/Au nanoparticles in the presence of template molecule. The modification procedure was characterized via cyclic voltammetry and electrochemical impedance spectroscopy. In the presence of K3Fe(CN)6 as redox probe, the peak current of K3Fe(CN)6 decreased linearly with the increasing concentration of 2,4-DCP from 5.0×10-8 to 1.2×10-4 mol/L(R2=0.9964) with a detect limit of 1.5×10-8 mol/L(S/N=3). Three chlorophenols possesing analogous structures, including 2,6-DCP, 2,4,6-trichlorophenol(2,4,6-TCP) and pentachlorophenol(PCP) were chosen to examine the specific recognition ability of the imprinted sensor. The results showed that MIP electrode had the highest current response toward 2,4-DCP. In addition, the feasibility of its practical applications has been demonstrated in the analysis of four water samples with the recoveries ranged from 95.2% to 109.3%.

Key words: 2,4-Dichlorophenol, Molecularly imprinted electrochemical sensor, Au nanoparticle, Poly-o-aminothiophenol, Self-assembly, Electrochemical polymerization

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