Zr-based metal organic framework nanoparticles coated with a molecularly imprinted polymer for trace diazinon surface enhanced Raman scattering analysis?

New Journal of Chemistry Pub Date: 2022-06-28 DOI: 10.1039/D2NJ01874H

Abstract

In this study, a new surface imprinted polymer of type MOFs–MIPs was synthesized with diazinon as the template and a Zr-based metal organic framework (UiO-67) as the matrix for trace diazinon surface enhanced Raman scattering (SERS) analysis in environmental water samples. The material was characterized by transmission electron microscopy (TEM), Fourier transform infrared (FT-IR) spectroscopy, X-ray photoelectron spectroscopy (XPS), thermogravimetric (TG) and N2 sorption analysis. Additionally, batch experiments were carried out to investigate the rebinding ability for diazinon by SERS. The results showed that the MOFs–MIPs showed a fast kinetic, high rebinding capacity, good selectivity, and excellent sensitivity (limit of detection = 3.6 nM) for diazinon, with good linear relationships of 10 nM–1.0 mM. Furthermore, the pseudo-second-order model and Langmuir adsorption isotherm are well fitted with the experimental data, indicating chemical adsorption might be the rate-limiting step. Moreover, the relative selectivity coefficients of the MOFs–MIPs for diazinon/acephate, diazinon/metham and diazinon/basta are 141.6, 160.3 and 142.8, respectively, indicating the high selectivity of MOFs–MIPs towards diazinon. The MOFs–MIPs could be used for at least 6 runs, indicating its favorable stability and reusability. Finally, real water samples were successfully analyzed with the MOFs–MIPs and high recoveries varying from 92.7% and 108.2% were obtained. Overall, the MOFs-MIPs possessed high affinity, high selectivity and sensitivity for daizinon detection in real water samples by SERS.

Graphical abstract: Zr-based metal organic framework nanoparticles coated with a molecularly imprinted polymer for trace diazinon surface enhanced Raman scattering analysis
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