Rapid room-temperature synthesis of IRMOF-3 for the detection of nitenpyram in water
The rapid development of modern agriculture generally relies on the massive use of pesti-cides,which also become the main organic pollutants in the environment due to the structural stability and high toxicity effects of pesticide molecules.In this study,IRMOF-3 with high fluorescence effi-ciency was prepared by a simple and rapid room-temperature synthesis method,and then applied to the fluorescence detection and analysis of the toxic neonicotinoid pesticide,nitenpyram(NIT).The results show that the prepared IRMOF-3 is a pure-phase crystalline material with stable photoluminescence at 427 nm;The blue fluorescence of IRMOF-3 can be quenched quickly by NIT in the aqueous environ-ment,which shows a good selectivity and a strong anti-interference ability among many interferences.The fluorescence analytical method developed by this method showed a significant correlation in the concentration range of 0～38 μmol/L of NIT,and the limit of detection(LOD)was as low as 0.35 μmol/L.The spiked recoveries demonstrated that the method had good recoveries(95.16%～106.51%)with the relative standard deviations(RSDs)≤6.68%.The analysis of the multiple characterization results indi-cated that the fluorescence detection mechanism mainly refers to the energy competition absorption of NIT for the excitation light.In addition,the fluorescence quenching due to electron transfer is also one of the fluorescence detection mechanisms of IRMOF-3 for NIT.In conclusion,IRMOF-3 based on fluorescence analysis has realized the detection of NIT with high sensitivity,which provides a simple and reliable analytical method for the future detection of NIT-type pollution in water environment.
IRMOF-3nitenpyramfluorescence detectionenergy competition absorptionelectron transfer
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