Abstract
Herein, a ratiometric molecularly imprinted electrochemical sensor for imidacloprid (IMI) detection is developed. The sensor is fabricated by modifying glassy carbon electrode with anthraquinone/ZrO2-carbon nanotube-biomass derived aerogel (AQ/ZrO2-CNTs-BA) composite, followed by electropolymerization of o-phenylenediamine in the presence of IMI. The BA prepared from lotus root powder possesses large specific surface area and plentiful active sites, beneficial for the immobilization of reference probe AQ and catalytic component ZrO2. CNTs can improve the composite stability and conductivity. When IMI is present, IMI molecules are rebound and its reduction peak appears. At the same time, as the occupied imprinted sites hinder the electrochemical reaction of AQ, the reduction peak of AQ decreases. Furthermore, under the optimized conditions their peak-current ratio (IIMI/IAQ) and IMI concentration shows a good linear relationship over the range of 0.05 − 10 μM. The detection limit is ca. 0.014 μM (S/N = 3). In addition, the ratiometric electrochemical sensor has good repeatability and selectivity. It has been applied to the detection of IMI in spiked samples and the recoveries are 82.0 % − 104 %.
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