Preparation And Photocatalysis Of TiO₂ Core-shell Microspheres And Hollow Microspheres

Energy shortage is a major problem facing the world.How to find an alternative energy source before fossil energy is exhausted is an urgent task.As a kind of inexhaustible clean energy,how to find a highly efficient catalyst and turn it into an available energy is the focus of scientific research workers.Semiconductor nanometer and micron scale catalysts are one of the most effective materials for environmental pollution and energy conversion.So far,titanium dioxide photocatalyst has been used in the purification of toxic and harmful gases and wastewater due to its biological and chemical inertness,strong oxidation,low toxicity,cheap and easy to obtain and other independent.In order to improve the catalytic activity of titanium dioxide,the morphology of?titanium dioxide affects its catalytic activity.Therefore,how to find a structural morphology that enhances the catalytic activity of titanium oxide has become the research focus of researchers.In this paper,the core-shell structure of titanium oxide and the controllable synthesis of two-dimensional nano-sheet titanium oxide are studied,and on this basis studies the synthesis mechanism of hollow titanium oxide doped with non-metallic carbon as well as its degradation of pollutants and photocatalytic decomposition of water to hydrogen.In addition.The controllable synthesis of rutile,TiO₂ with two-dimensional nano-sheet structure and its highly efficient pollutant degradation capacity were also investigated.The research of this paper is divided into two parts:First of all,in this thesis,the core-shell structure titanium oxide was synthesized by hard template method using 3-trisaminophenol resin ball as template,and then the calcined sample for different time in the air was carbonized under nitrogen.Hollow carbon doped titanium oxide with different carbon contents is obtained.And the effects of different roasting time on the photocatalytic decomposition of water were also investigated.Secondly,a two-dimensional nanosheet structure rutile TiO₂ was prepared by using tetrabutyl titanate as the titanium source and hydrochloric acid as the morphological modifier.It was found that when the concentration of hydrochloric acid was 3M,rutile TiO₂ was a microsphere with a diameter of about 4?m.When the acid concentration was 5M,rutile TiO₂ was a two-dimensional nanosheet structure.When the acid concentration was 7M,The morphology of TiO₂ is a solid rod-like structure.In addition,a series of characterization methods were used to elaborate the promotion of different morphological structures to enhance the photocatalytic activity of the catalyst.In summary,the morphology of hollow titanium oxide and the two-dimensional nanosheet titanium oxide rutile structure were prepared by hard template method and acid solution to control the morphology of titanium oxide,and its characterization and photocatalytic properties were studied.