Preparation of silica nanoparticles coated with fluorescent nanomaterials (imidazole) for pesticide detection in aqueous solutions
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DOI:
https://doi.org/10.5281/zenodo.14957407Keywords:
Fluorescent Nanomaterials, Quenching, Imidazole, PesticidesAbstract
Silica quantum dots are a preferred type of fluorescent materials and are highly appreciated due
to their exceptional properties and size. The study is summarized in several parts In the preparation of
fluorescent quantum dots by the reaction of ascorbic acid with Aptes (3-aminopropyl) triethoxy silane
(SIQDs). Then, the surface modification of SIQDs with a fluorescence-enhancing substance (amidazole)
becomes SIQDs-M. A simple alkaline hydrothermal process was used to synthesize and modify the
surface of silica quantum dots using imidazole to enhance the fluorescence emission and thus improve the
detection limit ratio. The structural information of the prepared silica for the two compounds SIQDs) 3
and (SIQDs-M) was obtained by XRD and then characterized by (FE-SEM), as well as TEM) and (FT
IR). The results also showed that the prepared silica quantum dots have a consistent size distribution
ranging from (12-20) nm, in addition to the optical properties, including a tenfold increase in fluorescence
intensity. The limit of quantitation (LOQ) and limit of detection (LOD) of the identified compounds were
determined using fluorescence spectroscopy at room temperature, and the results confirm that these
values are important in the use of fluorescence spectroscopy and have the necessary selectivity for
environmental applications and can effectively detect the pesticide (boric acid) in aqueous samples. The
optimum factors for the pesticide detection process (mixing time of solutions, concentration, pH effect
and ions) were studied, which proved the effectiveness of the prepared quantum dots in detecting the
pesticide.
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