Synthesis Of Two Porphyrin-based 2D-MOF And Application In Reduction CO₂

With the development of human economy and society,the global warming caused by the greenhouse effect has been aggravated day by day.As a result,a series of serious environmental problems have arisen,which have posed severe challenges to the survival and development of human society.Among them,carbon dioxide generated by the large consumption of fossil energy is the main culprit leading to the greenhouse effect.Therefore,how to effectively recover carbon dioxide,and fix it by technical means,or even turn it into an available energy source,has become a new research direction in the field of materials science.Recently,as the research on catalysts materials has become more and more in depth,the catalytic reduction of carbon dioxide has became a new research hotspot.However,due to the high self-stability of carbon dioxide,the high reduction potential and the complex reduction products,the research is still in its infancy.Currently,metal-organic frameworks compound have attracted much attention because of their uniform structure,tunable composition,large specific surface area and excellent catalytic performance.By adjusting the organic ligand type and coordination metal of the metal-organic frameworks compound,a catalyst with excellent properties,stable structure and good catalytic performance can be synthesized,which enables us to make the metal-organic frameworks compound a new choice for the catalytic reduction of carbon dioxide.On the other hand,porphyrin is a kind of macrocyclic organic compound widely existed in nature,which has a good octadecyl ring structure.In addition,through the different synthesis methods,the surrounding functional groups can be adjusted to form functionalized porphyrin molecules with different functional groups.Porphyrins are also a common ligand for metal-organic framework compounds and are used to synthesize metal-organic materials with photoelectrocatalytic activity.At the same time,molybdenum disulfide is a material with a layered structure similar to graphene,having good electron transfer ability.When it is mechanically converted from lamellar stacking to monolayer nanochips,use the ultrasonic probe to break the lamellar structure,forming quantum dots with a particle size less than 10 nm.Because of obviously quantum confinement effect,it has a lot of excellent photoelectric properties and good catalytic activity.Based on this,in this paper,it is intended to combine the carboxy based porphyrin with the carboxy group with the strong coordination of the metal,forming a structural stable metal organic compound structure,preparing carbon dioxide catalyst with certain shape.Furthermore,molybdenum disulfide quantum dots were added to the structure of organometallic frame compounds,obtaining in situ doped Composite Catalytic Materials with further study on its performance by Electrochemical method.The results show that it is a catalytic material with excellent catalytic reduction of carbon dioxide and the doping of the quantum dots of molybdenum disulfide also has a significant effect on its catalytic performance.Finally,the structure was further characterized by projection electron microscope,scanning electron microscope and Fourier transform infrared spectroscopy,analysis of the characterization results shows that it is a good two-dimensional metal organic framework compound.At the same time,molybdenum disulfide quantum dots can also be effectively mixed into the structure of organometallic compounds,it has a positive synergy with it to improve its catalytic efficiency for carbon dioxide.