Dual-template magnetic molecularly imprinted particles with multi-hollow structure for the detection of dicofol and chlorpyrifos-methyl.
In this work, a novel dual-template magnetic molecularly imprinted polymer particle for dicofol and chlorpyrifos-methyl was prepared through oil-in-water emulsifier-free emulsion technology. The resulting magnetic particles were characterized with electron microscopy, Fourier transform infrared spectroscopy, and X-ray diffraction. It was found that as-prepared particles were well-shaped spheres with multi-hollow structures and of a size around 125 μm. Meanwhile it showed a good magnetic sensitivity. The results testified that multi-hollow magnetic molecularly imprinted polymers possessed excellent recognition capacity and fast kinetic binding behavior to the objective molecules. The maximum binding amounts toward dicofol and chlorpyrifos-methyl were 31.46 and 25.23 mg/g, respectively. The feasibility of the use of the particles as a solid-phase extraction sorbent was evaluated. Satisfactory recoveries ranging from 90.62 to 111.47 and 91.07 to 94.03% were obtained for dicofol and chlorpyrifos-methyl, respectively, spiked at three concentration levels from real samples. The Langmuir isotherm equation provided an excellent fit to the equilibrium sorption data of either dicofol or chlorpyrifos-methyl. It provided a novel way to advise dual-template magnetic molecularly imprinted polymer particles to adsorb pesticides with high selectivity.
Key Laboratory of Oil Gas Fine Chemicals, Ministry of Education Xinjiang Uyghur Autonomous Region, College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi, China.|Xinjiang Product Quality Supervision and Inspection Research Institute, Urumqi, China.
Tao
T
Yang
Key Laboratory of Oil Gas Fine Chemicals, Ministry of Education Xinjiang Uyghur Autonomous Region, College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi, China.
Shun
S
Feng
Xinjiang Product Quality Supervision and Inspection Research Institute, Urumqi, China.
Yi
Y
Lu
Xinjiang Product Quality Supervision and Inspection Research Institute, Urumqi, China.
Chao
C
Yin
Key Laboratory of Oil Gas Fine Chemicals, Ministry of Education Xinjiang Uyghur Autonomous Region, College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi, China.
Jide
J
Wang
Chlorpyrifos-methyl; Dicofol; Dual-template; Hollow porous structure; Magnetic molecularly imprinted particles