Preparation And Sensing Properties Of Metal Ions Fluorescence Sensing Materials

Heavy metal ions have the characteristics of great biological toxicity,easy to be bio-enriched,and difficult to degrade naturally,which will cause great harm to human health and the ecological environment.Therefore,it is important to find materials with high selectivity and sensitivity to detect heavy metal ions.Since the fluorescence detection method is simple,accurate,economical and suitable for real-time feedback,it is a good strategy to design fluorescent probes.Aiming at the metal organic frameworks and organic-inorganic hybrid perovskite materials with the excellent application prospects,in this paper,a new metal organic framework material and a series of organic-inorganic hybrid perovskite materials have been prepared,and studied them in metal ion fluorescence sensing applications.The main research work and results of this paper are as follows:?1?The research progress of metal organic frameworks and organic-inorganic hybrid perovskite materials and their fluorescence sensing applications were introduced.?2?Based on the structure diversity,large specific surface area,adjustable porosity and customizable chemical properties of metal organic frameworks.In this paper,a new luminescent metal organic framework Ui O-66-NDC was successfully prepared by functional design of Ui O-66,and its fluorescence response to different metal ions was studied.The experiment proved that Fe³⁺ions has remarkable fluorescence quenching effect for Ui O-66-NDC,and the K_svvalue is 1.6×10⁴M^-1in the low concentration range of 0.01 to 0.1 m M.Therefore,Ui O-66-NDC can be used as a fluorescent probe for the highly selective and sensitive detection of Fe³⁺ions.?3?In view of the advantages of organic-inorganic hybrid perovskite materials such as high fluorescence efficiency,adjustable luminescence wavelength,short irradiation life and easy synthesis,and the photoluminescence properties of the materials are closely related to the content of Pb²⁺ions.In this paper,CH₃NH₃Br solution was used as a new platform for selective fluorescence detection of heavy metal lead ions,it will produce CH₃NH₃Pb Br₃and emit green fluorescence after mixing with Pb Br²solution,so that the concentration of heavy metal lead ions in the solution can be detected by fluorescence enhancement effect.Experiments show that this method has high recognition and sensitivity for Pb²⁺ions,and the detection limit of Pb²⁺ion concentration is as low as 1.6×10^-3M.This study provides a new idea for the application and development of perovskite materials in the field of fluorescence sensing.