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Electrochemical sensor based on molecularly imprinted composite membrane of poly(o-aminothiophenol) with gold nanoparticles for sensitive determination of herbicide simazine in environmental samples TEXT SIZE: A A A

A novel electrochemical sensor based on molecularly imprinted polymer membranes (MIPM) as biomimetic molecular recognition element involved in o-aminothiophenol functionalized Au nanoparticles (ATP@AuNPs) modified gold electrode was constructed for sensitive and selective detection of herbicide simazine (SMZ). The nano-scaled MIPM, with high specific surface area, was prepared by self assembly of o-aminothiophenol (ATP) and electrodeposition of ATP@AuNPs in the presence of template SMZ. Cathodic current of SMZ was measured by cyclic voltammetry and the results exhibited that the proposed sensor possess a high electrocatalytic activity at a negative potential and a fast rebinding dynamics towards the reduction of SMZ in 0.01 M H2SO4 solution (pH 1.7). Linear dependency of peak current on SMZ concentrations was observed from 0.03 to 140 M and detection limit was estimated to be 0.013 (3S/N). The enhancement of sensitivity was attributed to the presence of gold nanoparticles (AuNPs) which decreased the electron-transfer impedance and increased imprinting sites, lead to the superior enrichment effect of the trace amount of SMZ in aqueous solvent. The developed SMZ imprinted sensor exhibited excellent long-term stability and acceptable repeatability. In addition, the proposed method was successfully applied to measure SMZ in several real samples with the spiked recoveries changing from 91.4% to 96.8%, showing a promising potential in practical application. (C) 2016 Elsevier B.V. All rights reserved.

Publication name

 SENSORS AND ACTUATORS B-CHEMICAL, 249 747-755; 10.1016/j.snb.2016.02.068 OCT 2017

Author(s)

 Zhang, Jin; Wang, Chaoying; Niu, Yanhui; Li, Shijie; Luo, Rongqin

Corresponding author(s) 

 ZHANG Jin1,2; LI Shijie2  
 jzhang@gznc.edu.cn; lishijie@vip.gyig.ac.cn  
 1. Guizhou Normal Coll, Sch Chem & Life Sci, Guiyang 550018, Peoples R China 
 2. Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550002, Peoples R China

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