Synthesis And Application Of Composite Visible Light Photocatalysts Based On ZIF-based MOFs And Their Derivatives

The rapid development of society has brought about increasingly serious problems of resource shortage and environmental pollution.The method of converting visible light solar energy into chemical energy through photocatalyst has gradually become an important means to solve the aforementioned problems and has become a hot spot in the current research.The application of visible light photocatalysts mainly focuses on organic synthesis and pollution remediation.Scientific researchers have developed a large number of new photocatalyst for the above fields.ZIF based MOFs materials have been widely used in the construction of composite visible light photocatalytic materials because of their large specific surface area,ultra-high porosity and richness of catalytic active sites.After in-depth investigation of the relevant work in visible light photocatalysis in organic synthesis and pollution remediation,this thesis makes some improvements for the current limitations of its application.Firstly,during the synthesis of ZIF based MOFs material MAF-6,the homogeneous organic small molecule visible light photocatalyst Eosin Y（EY）was embedded in situ to obtain MAF-6@EY with good photocatalytic cross dehydrogenation coupling reaction performance.The composite visible light photocatalyst solves the problem of separation and recovery of homogeneous EY.Then,a method of synthesizing three-dimensional（3D）graphite phase carbon nitride（g-C₃N₄）semiconductor visible light catalyst using ZIF based MOFs material by sacrificial template method was explored.MDCN,a porous g-C₃N₄ material with rhombic dodecahedral structure,was synthesized with MAF-6 as template.The material has excellent catalytic activity on cross dehydrogenation coupling reaction under visible light,and can be recycled for more than 30 times.Finally,a new composite visible light catalyst ZIF-67@g-C₃N₄ was explored.Its photocatalytic degradation efficiency can be greatly improved through the synergistic effect of photocatalysis and Fenton like catalysis.In short,these new composite visible light photocatalysts prepared by ZIF based MOFs not only broaden the application field of MOFs,but also provide new research materials for the basic research in the field of photocatalysis.