CsPbBr₃ Sensor For Detecting Nitrophenol In The Environment

In recent years,while improving the efficiency of industrial development,China is also actively responding to environmental pollution issues such as industrial wastewater.There are nitrophenols in industrial wastewater,which are very toxic,seriously polluting the environment and even threatening human health.O-nitrophenol（ONP）,as a kind of phenolic compound,may cause headache,dizziness,nausea and other adverse reactions after being inhaled by the human body.In severe cases,it may inhibit the central nervous system or damage the liver and kidney functions.Therefore,how to quickly,efficiently and simply detect whether the ONP residues of phenol-containing wastewater discharged into rivers after treatment meets the discharge standard is of important research value.Fluorescence analysis method is widely used to detect various target substances due to its advantages such as fast detection rate and simple operation.The combination of fluorescence analysis and molecular imprinting technology constitutes a fluorescent imprinted sensor with high selectivity and high sensitivity,which has good application prospects in the detection of target substances.In this paper,perovskite quantum dots with high fluorescence performance were combined with molecular imprinting technology to obtain perovskite quantum dot molecular imprinted fluorescent sensors,which can quickly detect ONP in river sludge.The research was divided into the following three parts:1.CsPbBr₃@SHFW fluorescence sensor was prepared by superhydrophobic organic framework（SHFW）modified CsPbBr₃ quantum dots（QDs）,which was used for the detection of ONP in river silt.CsPbBr₃ QDs with high luminous efficiency were used as fluorescent materials,and the superhydrophobic properties of SHFW were used to protect CsPbBr₃ QDs from being affected by water vapor in the air.Under the best detection conditions,the linear range of CsPbBr₃@SHFW for ONP detection was 0-280μM,and the detection limit was 7.69×10^-3μM.Furthermore,CsPbBr₃@SHFW fluorescence sensor was successfully applied to the detection of ONP in river sludge,and the recovery rate of standard addition was 93.6-106.5%.2.In order to improve the selective recognition effect of CsPbBr₃ QDs on ONP,the fluorescence detection technology and molecular imprinting technology were combined,and the CsPbBr₃@Si O₂-MIPs fluorescence sensor was prepared by the sol-gel method.The morphology,structure and optical properties of CsPbBr₃@Si O₂-MIPs were explored through a variety of characterization techniques.The stability of CsPbBr₃@Si O₂-MIPs and the response time to ONP were studied using a fluorescence spectrophotometer.The results of selective experiments shown that CsPbBr₃@Si O₂-MIPs had a significant specific recognition effect on ONP.The constructed fluorescence sensor was applied to the detection of ONP in river sludge,and the recovery rate was 96-101.5%,and the relative standard deviation was less than 3.4%.3.Using green CsPbBr₃ QDs as the fluorescent material,ONP as the template,methyl formaldehyde acrylate（MMA）as the functional monomer,CsPbBr₃@MIPs was prepared by precipitation polymerization which ethylene glycol dimethacrylate was used as the crosslinking agent.Fluorescence sensor was used to selectively detect ONP.When the ONP concentration range was 0-193μM,the fluorescence of CsPbBr₃@MIPs was gradually quenched with the increase of ONP concentration,showing a good linear relationship,and the detection limit was 8.28×10^-3μM.Compared with other phenolic compounds in experiments,the fluorescence sensor exhibited high-efficiency selectivity for ONP.Moreover,when this sensor was applied to ONP detection in river silt,the recovery rate of standard addition was 90.8-101.5%.