Preparation Of Terpyridine-based Functional Supramolecular Polymers And Their Removal Of Water-soluble Pollutants

As one of the huge branches of environmental pollutants,water-soluble pollutants have a wide variety,including heavy metal ions,organic dyes,radioactive pollutants,etc.,which not only damage the ecological environment,but also seriously endanger human health.Therefore,the detection and treatment of water-soluble pollutants is of great significance.Based on imidazolyl terpyridine ligands,two types of terpyridine functional supramolecular polymers were prepared by means of Grubbs catalyst and BPO initiator for the detection and treatment of water-soluble pollutants.The main contents and results are as follows:(1)In Chapter 2,we prepared two types of polymer materials:the first is imidazole based supramolecular polymer prepared by polymerization initiated by Grubbs catalyst:the terminal olefins of ligands are connected by Grubbs catalyst to form supramolecular polymer POPMS;A new organic supramolecular polymer POPN was prepared by complexing the metal in POPMS with EDTA;In order to ensure the positive electric attraction of imidazolium salt to the greatest extent,anions such as NTf₂^-,Pf₆^-are converted into anions Br^-,Cl^-,which have small steric hindrance,to form POPB and POPC.The second is porphyrin supramolecular polymers prepared by free radical polymerization with photothermal initiators:(1)the ligands PORL2 and PORL3 were assembled with zinc ions(1:2 or 1:3)to prepare four porphyrin prismatic supramolecules,SP22,SP23,SP32 and SP33;Then 1,6-hexanedithiol and SP23were polymerized with DMPA to obtain porphyrin based supramolecular polymer PORL3P;(2)After radical polymerization of ligand PORL2 with thermal initiator BPO,it was assembled with zinc ions to form polymers PORS3 and PORS6.The related compounds were characterized by SEM,TEM and NMR.(3)In Chapter 3,we used GPC,ESI-MS,ICP-MS,UV spectrophotometer and other technologies to analyze the properties of the new polymer materials in Chapter 2.The results showed that the maximum adsorption capacities of methyl orange,Rhodamine B,acid orange and Re O₄^-by POPMS were 431.8mg/g,207.90mg/g,205.90mg/g and 361.2 mg/g respectively.Moreover,POPMS has excellent performance of selective adsorption of methyl orange.When the molar ratio of methyl orange to NO₃^-is 1:500,the removal rate is 64.14%,and when the molar ratio of methyl orange to SO₄^2-is 1:500,the removal rate is as high as 91.64%;Because the supermolecule SP23 has a specific cavity and the empty orbit provided by porphyrin zinc,we have tested its host guest recognition.To sum up,we have prepared two new types of supramolecular polymer materials and used them to test the adsorption performance of some water-soluble pollutants,which not only expands the application range of supramolecular chemistry,but also is expected to play a role in the field of environmental pollutant treatment.