Using a new octahedron UiO-66(Ce) to enrich target molecules for highly sensitive detection of ziram

We demonstrate a method for the detection of Ziram in water by using the adsorption properties of UiO-66(Ce) metal-organic framework (MOF) combined with the surface-enhanced Raman scattering (SERS) substrate of precious metal nanoparticles. The traditional UiO-66 is based on Zr as the metal center. After replacing the Zr metal center with Ce, the synthesized UiO-66(Ce) has short aging, high efficiency, low energy consumption, and energy saving. Furthermore, by adding P123, UiO-66 is modified to have a structure similar to the durian shell spine, which can provide more composite sites for metal nanoparticles. Thus, more SERS hot spots are generated. The combination of AuNPs with UiO-66(Ce) has been confirmed by XRD, XPS, and other characterization and analysis techniques. The Raman probe molecule R6G was used as an evaluation tool to evaluate the performance of this SERS substrate. The results showed that the relative standard deviation (RSD) of the substrate was as low as 8.96 % at a concentration of 10 –6 M of the R6G solution, and the substrate demonstrated high stability. Finally, the substrate was applied for the detection of ziram in lake water, achieving a detection concentration of 10 –8 M, an enhancement factor of 2.57 × 10 5 , and a detection limit as low as 5.21 × 10 –9 M, demonstrating excellent sensitivity and enabling efficient trace pollutant detection in complex water environments.