Study On Controllable Assembly And Catalytic Performance Of Ag,Cu NP@MOFs Composites

The rapid development of industry has not only promoted the rapid development of society,but also brought increasingly serious water pollution problems.Water pollution is mainly caused by the random discharge of organic pollutants.In order to solve the problem of water pollution,people have devised a variety of methods,but these methods are either unable to completely remove the pollutants,or the degradation efficiency is too low.The technology of photocatalytic degradation of organic pollutants came into being.This new type of technology mainly uses solar energy,which is in line with the contemporary concept of green and sustainable development and has good application prospects.In addition,the greenhouse effect is also a serious environmental problem at once,CO₂ is one of the main greenhouse gases.Researchers have actively synthesized various types of catalysts,for example,to catalyze the cycloaddition reaction of CO₂ and epoxide to produce cyclic carbonates and other valuable chemicals.Today,researchers are still actively exploring catalysts with higher catalytic performance and higher stability.To the best of our knowledge,we plan to use relatively simple and feasible methods to synthesize amino-modified MOFs materials-NH₂-101-MIL?Cr?,and use the template method to synthesize the spherical shell-shaped NH₂-101-MIL?Cr?,then load Ag nano-scale particles on the MOFs through the following methods including sulfhydryl group modification,coordination of sulfhydryl group with Ag⁺and techniques such as SEM,XRD,XPS to characterize the synthesized materials,it can be proved that the synthesized materials are the target compounds.Finally,by optimizing the ratio of raw materials,the satisfied product with the uniform shape of the spherical shell,the uniform distribution of metal particles and the controlled size was prepared.Then,the performance of photocatalytic degradation of rhodamine B was tested on the synthesized material,and it was found that the catalytic effect of the composite is significantly better than those of two pure components.Moreover,the catalytic performance of the composite for ring-opening addition of CO₂and epichlorohydrin was also tested,and similar result was obtained.And the possible catalytic mechanisms of aforementioned two catalytic reactions were proposed.In addition,this paper also carried out related research on the combination of NH₂-53-MIL?Al?and Cu-Ag nano-alloy particles,which can reduce the dosage of noble Ag on the one hand,and on the other hand can combine the advantages of two metals and make up for the deficiencies of Cu.And the alloy was loaded on NH₂-53-MIL?Al?to further improve the catalytic performance.Performance tests of photocatalytic degradation of rhodamine B and catalytic ring-opening addition of CO₂and epichlorohydrin by Cu-Ag nano-alloy particles loaded MOFs were also conducted.It is hoped that this research can provide basic data for designing novel and high effeicient catalysts for photocatalytic degradation of organic pollutants and carbon dioxide chemical conversion.