Citation: SHI Xiao-Xue, LI Xiu-Qi, WEI Xiao-Ping, LI Jian-Ping. Molecularly Imprinted Photoelectrochemical Sensor Based on AgBiS₂/Bi₂S₃ for Determination of Propoxur[J]. Chinese Journal of Analytical Chemistry, ;2020, 48(3): 396-404. doi: 10.19756/j.issn.0253-3820.191608 shu

Molecularly Imprinted Photoelectrochemical Sensor Based on AgBiS₂/Bi₂S₃ for Determination of Propoxur

Guangxi Key Laboratory of Electrochemical and Magnetochemacal Function Materials, College of Chemical and Bioengineering, Guilin University of Technology, Guilin 541004, China

Received Date: 16 October 2019
Revised Date: 20 December 2019

Fund Project: This work was supported by the National Natural Science Foundation of China (No. 21765006) and the Guangxi Natural Science Foundation, China (Nos. 015GXNSFFA139005, 2018GXNSFAA138145).

A molecularly imprinted photoelectrochemical sensor based on AgBiS₂/Bi₂S₃ was constructed for detection of insecticide propoxur. AgBiS₂/Bi₂S₃ composites were synthesized on Ti substrate by solvothermal method. Using propoxur as a template molecule and o-phenylenediamine as a functional monomer, a molecularly imprinted polymer film was formed by electropolymerization on Ti modified with AgBiS₂/Bi₂S₃ composite material, which could be used for the specifically recognition of propoxur. The specific binding of propoxur to the imprinted cavity hinders the electron donor from passing through the cavity to the surface of the electrode, resulting in a decrease in photocurrent, and based on this, the detection of propoxur was performed. The logarithm of the concentration of propoxur was linear with the photocurrent in the range of 1.0×10^-12-5.0×10^-10 mol/L, and the detection limit was 2.3×10^-13 mol/L. The sensor was applied to the detection of propoxur residues in actual fruit sample, and the recoveries were 101.0%-103.1%.
- Molecularly imprinted sensor,
- Photoelectrochemical sensor,
- Propoxur,
- AgBiS₂/Bi₂S₃ composites,
- Pesticide residue
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Molecularly Imprinted Photoelectrochemical Sensor Based on AgBiS₂/Bi₂S₃ for Determination of Propoxur