Construction Of Ruthenium-Containing Ligands Based MOFs Materials And Their Photocatalytic Properties

The development of the chemical industry has led to more environmental pollution,despite promoting economic development.In order to effectively improve environment and limit pollution,photocatalytic technology has been focused on.The development of photocatalytic technology cannot be separated from the research and development of photocatalysts.Therefore,using photocatalytic technology to solve current environmental problems has become a current research highlight.Therefore,developing new,efficient,renewable energy photocatalysts is a very valuable research topic.Metal-organic frameworks（MOFs）have attracted great interest for its fascinating structures and potential applications in various fields,such as gas adsorption and separation,fluorescence,drug delivery,and chemical sensing.Recently,porous MOFs with the ability to photocatalysis has been reported for a variety of applications,such as the photocatalytic reduction of CO₂.The reaction is driven by solar energy and artificially simulates the photosynthesis of plants,converting all CO₂ into fuel and satisfying the concept of sustainable development.In addition,the photocatalytic oxidation degradation of organic pollutants using MOFs is an effective way to improve the treatment of water pollution,which not only has a high removal rate but also does not cause secondary pollution,satisfying the concept of"green chemistry".In this paper,we designed and synthesized two Ruthenium-containing organic ligands by using a photosensitizer functionalization strategy,and synthesized four photoactive MOFs under solvothermal conditions,and systematically investigated their photocatalytic properties and the factors affecting the photocatalytic degradation efficiency.The paper mainly includes the following two aspects:（1）Construction of Zn-MOFs materials and their photocatalytic properties.First,two Ruthenium-containing organic ligands,have been designed and synthesized,[Ru（phen）₂（bpydc）]Cl₂（L1）and[Ru（bpy）₂（bpydc）]Cl₂（L2）.Then,two 2D-MOFs,[Zn₂(Ru C₃₆N₆O₄H₂₁)（C₂O₄）₂（H₂O）₃]·（DMF）₂（compound1）and[Zn₂(Ru C₃₂N₆O₄H₂₁)（C₂O₄）₂（H₂O）₃]·（DMF）₂（compound 2）,have been successfully synthesized by solvothermal method using L1 and L2 as organic ligands and zinc ions as metal sources.Compounds 1 and 2 have been used as photocatalysts to investigate their performance of photocatalytic oxidation degradation of methylene blue（MB）and rhodamine B（Rh B）and the factors affecting the efficiency of photocatalytic degradation,respectively.The experimental results showed that both compounds exhibited ultra-high photocatalytic activity under visible light irradiation,and prolong the reaction time will lead to the increasing of the photocatalytic efficiency.（2）Construction of In-MOFs materials and their photocatalytic CO2 reduction properties.Two three-dimensional MOFs materials with acs topology have been synthesized[In₃O（L1）₃（H₂O）₃]·（NO₃）（compound 3）and[In₃O（L2）₃（H₂O）₃]·（NO₃）（compound 4）,by using L1 and L2 ligands and indium nitrate.Compounds 3 and 4were used as photocatalysts to investigate the performance of the photocatalytic CO₂reduction reaction,the photocatalytic MB oxidative degradation of organic pollutants and the factors affecting the photocatalytic degradation efficiency,respectively.The results showed that both compounds exhibited good photocatalytic performance for CO₂ reduction.It is worth mentioning that the only product is CO after the photocatalytic CO₂ reduction reaction,indicating that compounds 3 and 4 have excessive chemical selectivity.At the same time,compounds 3 and 4 also showed good photocatalytic oxidation degradation performance of organic pollutant MB,but excessive photocatalysts resulted in a negative trend in degradation efficiency.In summary,we have constructed four Heterometallic MOFs materials by using two Ruthenium-containing organic ligands and zinc/indium salts,and systematically investigated their performance in photocatalytic oxidation degradation of organic pollutants and photocatalytic CO₂ reduction reaction.