| Since Professor Fujishima of the University of Tokyo discovered the photocatalytic effect in the 1960 s,there has been a lot of research on the technology of photocatalytic cracking water to produce hydrogen and photocatalytic decomposition of pollutants.As common photocatalyst,titanium dioxide material has the advantages of non-toxicity,corrosion resistance,light/chemical stability and so on.However,because titanium dioxide itself is a wide band gap semiconductor material,it has a weak energy response to the visible light range,and the photo-electron-hole pair recombination speed is fast,which limits its practical application.How to effectively enhance the photocatalytic efficiency of titanium dioxide material is an important research direction for the application of photocatalytic technology.In this paper,samples of titanium dioxide nanotubes with regular morphology were first prepared,and the surface morphology parameters and specific surface area of the samples were tested,and the influence of the preparation conditions on the two was studied.Secondly,the amorphous titanium dioxide nanotubes were calcined to obtain samples of titanium dioxide nanotubes with different crystal forms,and the effect of calcination temperature on the crystal form was studied.In addition,in this paper,graphene quantum dots were also prepared by chemical methods,and composites were prepared by different composite methods and composite contents.Then,the photocatalytic efficiency of titanium dioxide nanotubes with different morphologies,different crystal forms and different amounts of graphene quantum dots was tested,and the effects of specific surface area,crystal form and graphene quantum dot recombination on photocatalytic efficiency were studied.The final results show that when preparing the composite,the higher the content of graphene quantum dots in the solution used for the composite,the higher the photocatalytic efficiency of the prepared composite. |
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