Study On Fluorescence Sensing And Lithium Storage Performance Of MOF Composite Material

Due to the modifiable nature of the luminescent group of MOFs and its abundant active sites,it has received extensive attention in fluorescent sensing and anode materials for lithium-ion batteries.At the same time,the recombination of the guest molecule can"icing on the cake"for its performance.Therefore,in recent years,there have been more and more research reports on using the porosity of MOFs to load guest luminescent groups to prepare dual-emission or multi-emission MOF composite materials for self-calibrated fluorescence to identify anions,cations and small organic molecules in the environment.In addition,the MOF composite material mixed with metal selenide and carbon matrix has gradually become one of the most popular LIBs anode materials due to its high volume capacity,electrical conductivity and limitations on the shuttle effect.（1）Using 4,5-imidazole dicarboxylic acid as an organic ligand,and a transition metal Cd²⁺salt with d¹⁰structure,a novel metal-organic framework material Cd-MOF was obtained by solvothermal method.A series of R@C composite materials with color changes visible to the naked eye were prepared by using Rh B molecules for in-situ packaging.The successful loading of Rh B was confirmed by powder X-ray diffraction,infrared spectroscopy,thermogravimetry,and pore size distribution.Rh B loading capacity and optical properties.In addition,the known Zn-MOF was post-synthesized and modified by the lanthanide post-encapsulation method to prepare the Ln³⁺@Zn-MOF composite material and perform basic characterization.（2）In view of the excellent luminescence properties of R@C and Ln³⁺@Zn-MOF,we further studied the practical application of R@C3 and Eu³⁺@Zn-MOF as self-calibrated sensing materials in the detection of environmental pollutants,and discussed The possible sensing mechanism is discussed.The experimental results show that R@C3 can selectively recognize 4-nitroaniline;Eu³⁺@Zn-MOF has obvious recognition effects on Fe（III）,Cr（VI）and 4-nitroaniline.Compared with the original MOFs,they all show higher sensitivity and selectivity.（3）Cd-MOF derivatized selenization was used to obtain cadmium selenide nanoparticles,which were modified with reduced graphene oxide（RGO）to prepare Cd Se@RGO composite materials.Based on the characteristics of Cd Se@RGO with small band gap energy,high mobility and good cycle stability,the lithium storage capacity of Cd Se@RGO as a lithium ion anode material was discussed,and the lithium storage performance of Cd Se was compared.The results show that Cd Se@RGO has a higher capacity and a larger diffusion coefficient than the original cadmium selenide,and also exhibits excellent cycling ability.This research provides a reference for the design of metal selenide electrode materials that can improve their chemical properties.