Preparation,Modification And Photodegradation Performance Study On Spherical Titanium Dioxide

Recently,as a typical semiconductor material,TiO₂ has become a widely used photocatalytic material that attracts people’s attention because of its excellent photocatalytic activity,innocuity and low cost.However,in practical application,some problems have seriously hindered the application of TiO₂ in the field of photocatalysis,for example,the narrow spectral response range,the low quantum efficiency,low light energy utilization rate and difficulty in recycling.How to discard or improve these problems and prepare TiO₂photocatalyst with excellent photocatalytic performance is the key to its wide application in reality.In this paper,we synthesized two kinds of spherical TiO₂ with high dispersity and high specific surface area,and researched the photocatalytic performance of these photocatalysts by loading metal or metal oxide.This has made a beneficial exploration for the development and application of TiO₂ photocatalyst.Firstly,we used tetrabutyl titanate as titanium source to obtained two kinds of spherical TiO₂ by sol-gel method and solvothermal method,respectively.The prepared spherical TiO₂ were uniform in size and stable in anatase crystal form.Secondly,we prepared three series photocatalyst of Cu-TiO₂,Ag-TiO₂ and Pd-TiO₂ by loading with metal particles on the basis of the spherical TiO₂ which prepared by sol-gel method.Based on the spherical TiO₂ prepared by solvothermal method,we prepared four series photocatalyst of CuO-TiO₂,Fe₂O₃-TiO₂,Ag₂O-TiO₂ and PdO-TiO₂ by loading with metal oxide.We also synthesisd seven series photocatalyst of M/MO-TiO₂（M=Cu,Fe,Ag,Pd）by photoreduction method based on the two kinds of spherical TiO₂ that have been prepared.Then,we characterized the crystal structure,morphology,element type,element state and spectral characteristics of the prepared photocatalysts by XRD,SEM,TEM,XPS,EDS and UV-Vis.Finally,we selected methylene blue solution to evaluate its photocatalytic performance and stability performance by degradation experiments.From the experimental results,it can be seen that the two pure TiO₂ prepared in this paper have not only low response under visible light but also poor degradation effect on MB.However,the photocatalysts prepared by modification have obviously improved their photocatalytic performance.