Synthesis And Photocatalytic Activity Of Transition Metal Titanate

In this thesis,the titanate material is prepared by the sol-gel method,and the pure titanate material is modified by three modification methods of template agent,loading and loading basis by adding the template agent,and obtained three photocatalytic materials under different modified conditions.Using PEG4000 as a template,the pure zinc titanate was modified to obtain a porous zinc titanate with better activity,and the influence of the dosage of PEG4000and the calcination temperature on the photocatalyst was explored;ZnTiO₃/SiO₂ photocatalyst was prepared with quartz sand as the support,and explore the effect of loading on the photocatalyst activity;based on the best silica sand loading photocatalyst,then continue to use PEG4000 to modify it,and explore the combined effect of quartz sand and PEG4000 on the photocatalyst catalytic effect influences.Finally,use XRD,SEM,TEM,FT-IR/FIR,UV-Vis DRS,BET,BJH,XPS and other characterization methods to characterize the prepared photocatalyst,observe and analyze the various parameters,morphology and properties of the catalyst on the catalytic effect impact.Using Reactive Brilliant Red X-3B as the degradation dye,the degradation products were analyzed by UV-Vis and spectrophotometer.（1）Using PEG4000 as a template,a porous ZnTiO₃ catalyst was prepared by the sol-gel method.PEG4000 helps crystal growth to a certain extent,but when the dosage is too much,Zn₂TiO₄ will be formed.The template agent can increase the specific surface area and pore volume,make the original large particles of the catalyst loose and porous,thereby improving the photocatalytic activity.When the calcination temperature is low,the crystal is not shaped,and when the calcination temperature is too high,other impurities will be generated.Therefore,when the calcination temperature is 800℃and the dosage of PEG4000 is 1.5 g,The catalyst showed the highest degradation efficiency of 79.8%for Reactive Brilliant Red under the irradiation of UV lamp for 30 min.（2）The supported ZnTiO₃ catalyst was prepared by the sol-gel method with quartz sand as the support.The loaded sample not only increased the grain size,but also had a larger specific surface area and pore volume than pure ZnTiO₃,which led to the improvement of the catalyst’s degradation efficiency of Reactive Brilliant Red X-3B.After being irradiated with ultraviolet light for 30 min,the degradation efficiency of the photocatalyst at 50%loading was the highest,reaching 59.2%,while the degradation rate of unmodified zinc titanate was only 24.4%.（3）The titanate material was prepared by the sol-gel method.Based on 50%ZnTiO₃/SiO₂,different amounts of PEG4000 were added to further modify it to obtain 50%ZnTiO₃/SiO₂（nPEG4000）.The addition of the template agent does not change the crystal structure,and will increase the specific surface area and pore volume of the catalyst,so that the catalyst will form more mesopores,thereby improving the photocatalytic efficiency.After 30 min of UV light irradiation,the 50%ZnTiO₃/SiO₂（1.5PEG4000）catalyst showed the best activity,and the degradation rate of Reactive Brilliant Red X-3B could reach 52.3%.