Synthesis And Catalytic Performance Of Metalloporphyrin-based Metal-Brganic Frameworks

Metal-organic frameworks?MOFs?is a new class of porous materials consisting of alternating organic ligands and inorganic metal ions or metal clusters.Owing to their open framework structure,high specific surface area,high porosity,suitable hydrophilic and hydrophobic properties and tunable pore size.MOFs have great prospects of application in gas adsorption and separation,catalysis,chemical sensing,biomedicine etc.In recent decades,with the rapid development of industry,environmental problems such as water pollution,and greenhouse effect are getting worse,which has enhanced people's awareness of environmental protection and governance.In order to explore the application of metal organic framework materials in the environment and further improve its performanc e,we synthesize two kinds of MOFs using metalloporphyrin as ligands and mainly explore two aspects including the degrading of synthetic dyes and cycloaddition reaction of carbon dioxide.The experimental content of this paper is divided into the following four parts:In the first part:5,10,15,20-tetrakis?4-carboxyphenyl?zinc porphyrin?Zn-TCPP?and 1,2,4,5-tetrakis?4-carboxyl Phenyl?benzene?H₄TCPB?are synthesized,which are used as organic ligands to synthesize Zr-MOF with good stability according to the theory of Hard-Soft-Acid-Base.The material is characterized by UV-vis,FT-IR,PXRD,BET and SEM.In the second part:we use the prepared material to adsorb the organic dye CV.The most important factors affecting the adsorption of CV are the dosage of material and the pH of the adsorption system.50 mL of crystal violet?10 mg/mL?could be adsorbed completely by 10 mg of material for only one hour without any additives such as hydrogen peroxide or supplementary means such as ultrasound or microwave.In the third part:in this section,based on concerns about issues of greenhouse gas,we synthesize a composite MOF catalyst with high density Lewis acid and basic sites.The material is characterized by UV-vis,FT-IR,PXRD,BET,TGA,SEM and TEM.In the fourth part:the composite MOF catalyst synthesized in part 3 is used to investigated the efficiency of converting carbon dioxide and epoxide to cyclic carbonate under mild conditions?50??1 bar CO₂?.Especially when propylene oxide,epichlorohydrin and allyl glycidyl ether are used as substrates,the conversion rate reach 100%,98%,95%respectively.The experimental results show that the synergistic effect of the two framework materials in the composite MOF catalyst has good catalytic performance in the cycloaddition reaction of carbon dioxide.In addition,the experimental system has a good catalytic effect on a variety of terminal epoxides.