• 文献标题:   Electrochemical Sensor for Determination of Chlorpyrifos Based on Graphene Modified Electrode and Molecularly Imprinted Polymer
  • 文献类型:   Article
  • 作  者:   TAN XC, WU JW, HU Q, LI XY, LI PF, YU HC, LI XY, LEI FH
  • 作者关键词:   chlorpyrifo, graphene, molecularly imprinted polymer, electrochemical sensor, ethylene glycol maleic rosinate acrylate
  • 出版物名称:   CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
  • ISSN:   0253-3820 EI 1872-2040
  • 通讯作者地址:   Guangxi Univ Nationalities
  • 被引频次:   3
  • DOI:  
  • 出版年:   2015

▎ 摘  要

Graphene and a novel cross-linker (ethylene glycol maleic rosinate acrylate) were used to prepare molecularly imprinted electrochemical sensors with high sensitivity. A molecular imprinting polymer (MIP) film was created on a graphene-modified glassy-carbon electrode for determination of chlorpyrifos (CPF) using free radical polymerization method. The electrochemical properties of the MIP and non. imprinted polymer (NIP) sensors were investigated via cyclic voltammetry (CV), linear sweep voltammetry, and electrochemical impedance spectroscopy (EIS). The surface morphology of the imprinted film was characterized by scanning electron microscopy (SEM). Under the optimal experimental conditions, the peak currents were proportional to the concentrations of chlorpyrifos in the range of 2. 0x10(-7)-1. 0x10(-5) mol/L with a detection limit of 6. 7x10(-8) mol/L (S /N = 3). The linear equation was I-p(mu A)= -7. 1834-0. 2424C (mu mol/L) (R-2 = 0. 9959). Adsorption model of the molecular imprinted sensor was investigated, and the measured imprinting factor. of the sensor was 2. 59, with the binding rate constant k of 12. 2324 s. The developed electrochemical sensor based on graphene modified electrode and molecularly imprinted polymer exhibited good repeatability and stability, and was successfully used to determine CPF in water and vegetable samples with recoveries from 94. 1% to 101. 1%.