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A magnetic and carbon dot based molecularly imprinted composite for fluorometric detection of 2,4,6-trinitrophenol
摘要： A magnetic molecularly imprinted composite was prepared by reverse microemulsion using carbon dots (CDs), Fe3O4 as the co-nucleus, and a molecularly imprinted polymer (MIP; with 2,4,6-trinitrophenol as the template) acting as recognition sites. The composite of type CD/Fe3O4@MIPs was characterized by transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), Fourier transform infrared spectroscopy (FT-IR), zeta potentiometric analysis, X-ray diffraction (XRD) and vibrating sample magnetometry (VSM). The results showed that the composite MIP has a spherical shape with average diameter of 200 nm. They also showed that the composite contains core-shell structures with several Fe3O4 nanoparticles and CDs embedded in each of the microsphere. The composite can extract 2,4,6-trinitrophenol (TNP) and has an imprinting factor of 3.6. It has high selectivity and sensitivity for TNP which acts as a quencher of the fluorescence of the CDs (with excitation/emission maxima at 370/470 nm). The limit of detection of this fluorometric TNP assay is 0.5 nM. The method was successfully applied to the determination of TNP in spiked tap water and river water samples, and recoveries ranged from 89.4% to 108.5% (with an RSD of <6%).
关键词： Fluorescence quenching,Fe3O4 nanoparticles,Stern-Volmer plot,Environmental pollutants,Reverse microemulsion method,Selective recognition,Molecularly imprinting
更新于2025-09-23 15:23:52
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Simple preparation of fluorescence probe based on CdTe quantum dots combined with MIP for selective detection of sulfadimidine
摘要： A simple fluorescence sensor for the detection of sulfadimidine (SM2) was fabricated by molecular imprinting technology. Cadmium telluride quantum dots (CdTe QDs) as the fluorescent material, 3-aminopropyltriethoxysilane (APTES) as functional monomer, sulfadimidine as template molecule and tetraethoxysilane (TEOS) as cross-linker, the CdTe QDs were embedded in silica nano-particles by reverse microemulsion method. Under optimal detection condition, response is linear in the 2–30 μmol L?1 SM2 concentration condition with the detection limit was 0.4 μmol L?1. In addition, the correlation coefficient was 0.9857 and the imprinting factor was 4.82. The fluorescent probe was successfully applied to the determination of SM2 in tap water and milk sample with the spiked recoveries ranging from 99.8 to 103.2%. It gets a good specific recognition ability and potential practical application value.
关键词： reverse microemulsion method,molecular imprinting technology,sulfadimidine,CdTe quantum dots,fluorescence sensor
更新于2025-09-12 10:27:22