Preparation And Properties Of Multifunctional Hybrid Materials Based On Lanthanide Coordination Polymer

The lanthanide coordination polymer belong to a crystalline material formed by coordination self-assembly between an organic ligand containing a nitrogen/oxygen hetero atom and a lanthanide metal ion.It is widely used in various fields due to its excellent optical properties and flexible structure.The combination of lanthanide coordination polymer with other functional materials to prepare hybrid materials with multiple functions is an effective way to extend the application of lanthanide coordination polymer.Due to its abundant variety and diverse functions,lanthanide coordination polymer become the first choice for precursor material in hybrid material.In this study,the lanthanide coordination polymer?Tb-CP?was combined with metal-organic framework?UiO-66-NH₂?by covalent post-synthesis modification method to successfully prepare hybrid material with exceptional properties for selective removal of dyes and detection of metal ions.The main contents are as follows:?1?The lanthanide coordination polymer hybrid material UiO-66-NH₂@Tb-CP?1?was prepared by covalent post-synthesis modification method,and the structure and properties of the hybrid material were systematically studied through a series of characterization techniques.Since the two precursor materials in the hybrid material have different physical and chemical properties,we use the hybrid material for the removal of organic dye molecules and the detection of metal ions.The experimental results show that the hybrid material not only has excellent dye removal ability,but also has superb metal ion detection properties.The hybrid material was then used to detect metal ions and remove dye recycling experiments.It was found that it can be utilized for the removal of organic dyes after detecting metal ion,and can continue to be used for metal ion detection after removing dye.Therefore,we have successfully prepared a general-purpose multifunctional hybrid material with the function of detecting metal ions and removing organic dyes.?2?Based on the above research on the properties of hybrid material UiO-66-NH₂@Tb-CP?1?,the new hybrid material UiO-66-NH₂@Tb-CP?2?with intense green luminescence has been prepared by changing the doping ratio of UiO-66-NH₂ precursor.Different from the UiO-66-NH₂@Tb-CP?1?,the new hybrid material exhibits strong green fluorescence due to the lower content of UiO-66-NH₂.Then the new hybrid material was used for the detection of organic acids.It was found that it could be effective for detecting 1,4-naphthalic acid.The luminescence of hybrid material UiO-66-NH₂@Tb-CP?2?was quenched by 1,4-naphthalic acid,which colour changed from green to blue.The reason would be probably due to ligand exchange.Therefore,the new hybrid material is expected to be widely used as a highly efficient fluorescent probe for the detection of organic acids.