Fluorescence Analysis Of Nitrophenol Pollutants Based On Mesoporous Silica Complexes

Entering the 21st century,the global economy has developed rapidly.In the context of the continuous pursuit of economic benefits,the pollutants emitted by human production continue to increase.Excessive levels of pollutants will pose a huge threat to human survival.Many pollutants have strong biological toxicity such as carcinogenic and teratogenic.Therefore,the problem of environmental pollution cannot be underestimated.It is urgent to establish a detection method for rapid detection of pollutants in water with high sensitivity.In this paper,two double-doped fluorescent probes were prepared for the rapid and effective detection of nitrophenolic organic pollutants in water.This paper mainly conducts research from the following two aspects:（1）Zinc oxide quantum dots were synthesized by sol-gel method,and then the surface was aminated by APTES.During the synthesis of mesoporous silicon,the prepared zinc oxide quantum dots and rhodamine B dye were doped into the mesoporous silicon framework structure,double-doped fluorescent probes were formed.The morphology,structure and luminescence properties of the synthesized nanoprobes were characterized by SEM,infrared absorption spectroscopy,ultraviolet-visible absorption spectroscopy and fluorescence spectroscopy.The detection results show that the material has good stability and spherical structure,and the probe has good luminescence performance,and the fluorescence quenching effect of the probe is obvious in the process of increasing the concentration of p-nitrophenol.There is a good linear relationship between the logarithm of the increase in fluorescence intensity of the double-doped fluorescent probe and the logarithm of the concentration of 4-NP in the range of 1-1000μmol L^-1,and the linear equation is lg（ΔF）=0.572lg C+6.653（R²=0.991）,the detection limit of this method is 0.3μmol L^-1（3σ）.In the detection of sewage and wastewater samples,the recovery rate was between 90.3%and 102.1%,and the relative standard deviation was less than 3.8%,indicating that the probe has a good application in the detection of nitrophenolic organic pollution in the environment.prospect.（2）Manganese-doped zinc sulfide quantum dots were synthesized by sol-gel method,and the quantum dots have excellent water solubility.The mesoporous silicon was synthesized by the st?ber method.The dye molecules and the carboxylated manganese-doped zinc sulfide quantum dots were cross-linked with NHS in the presence of the cross-linking agent EDC.In the template agent 4-NP,functional monomer APTES and Imprinted polymer fluorescent microsphere probes coated with manganese-doped zinc sulfide quantum dots and dyes were synthesized by sol-gel method under the action of cross-linking agent TEOS.The probe has good stability and fast response time to 4-nitrophenol.The probe has a linear range of 0.01-10μmol L^-1for the detection of 4-NP,and the detection limit is as low as 0.003μmol L-1（3σ）.The method was applied to the detection of environmental water samples,and the recovery rate was between 91.0%and 103.9%,and the relative standard deviation was less than4.9%.The probe has potential application value in the detection of trace amounts of p-nitrophenol in environmental water samples.