Construction And Conversion Of Co/Ti-Based MOF And Their Photocatalytic Performance

Recently,the consumption of fossil energy is increasing which inevitably brings a variety of environmental problems.Photocatalytic reduction of CO₂ using clean and renewable sunlight as energy source is a promising CO₂ conversion technology.MOFs materials have been widely used in the field of photocatalysis,mainly due to its rich channels and the introduction of photo active coordination.The purpose of this thesis is to synthesize2D gold nanoparticles-loaded MOF and hollow porous cage TiO₂,then to study their photocatalytic reduction of CO₂ under different conditions and performance in the formation of Schiff base from benzyl alcohol and nitrobenzene.The content above explore further application in the field of photocatalysis of MOFs.The application of 2D MOFs in photocatalytic reduction of CO₂ can effectively improve the slow mass transfer of CO₂ and products of 3D MOF.Then the photocatalytic activity is further enhanced by loading gold nanoparticles.PPF-3 was synthesized by PVP assisted solvothermal method and loaded with different amount of gold nanoparticles to reduce CO₂.The experimental results show that the best the mass ratio of Au nanoparticles to PPF-3₁ is1:10.The average generation rate of HCOOH is 42.7?mol g^-1h^-11 in 4 hours.In addition,the thin Au/PPF-3 has better catalytic performance compared with Au/PPF-3₂.The main role of gold nanoparticles is to enhance the optical absorption capacity of Au/PPF-3 through the plasmon resonance effect.This study provides a novel and general strategy for the construction of efficient MOF based photocatalysts.TiO₂ materials prepared by porous MOFs can integrate the advantages of MOF into TiO₂materials to enhance the photocatalytic performance.Using NH₂-MIL-125 as template,porous hollow cage like titanium oxide was prepared by introducing L-alanine,and then porous hollow cage like titanium oxide was prepared by burning.The TiO₂ was applied to photocatalytic reaction of benzyl alcohol and nitrobenzene to form Schiff base.Its photocatalytic performance is better than P25 and the bulk TiO₂ obtained by directly burning NH₂-MIL-125.The experimental results show that the porous hollow cage TiO₂ treated at590?has the best photocatalytic performance.The conversion of Schiff base reaches 97.6%.