Research On Synthesis And Phtocatalytic Property Of High Performance Photocatalytic Tungsten Trioxide

Tungsten trioxide is considered to be one of the most promising photocatalytic materials due to its excellent photo-corrosion resistance and green environmental protection.By controlling the preparation process of tungsten trioxide,the microstructure of tungsten trioxide can be controlled to expose different crystal planes,thus improving the photocatalytic performance of tungsten oxide.At present,the synthesis process of some morphology nanocrystalline tungsten oxide is still complicated.Therefore,it is urgent to realize the controllable synthesis of nano-tungsten oxide with different morphologies through a simple preparation process,and to promote the large-scale industrialized production of nano-tungsten oxide more quickly.In this paper,tungsten trioxide nanomaterials with different morphologies were synthesized by hydrothermal method and solvothermal method.Their phases,morphology and microstructure were characterized by X-ray diffraction,field emission scanning electron microscope,Raman spectroscopy and transmission electron microscope,respectively.The photocatalytic degradation of Rhodamine B solution with different morphologies of tungsten oxide as photocatalyst was carried out.The photocatalytic properties of Rhodamine B solution were tested and the photocatalytic mechanism was analyzed.?1?Using sodium tungstate and hydrochloric acid as raw materials,hexagonal tungsten trioxide nanorods were synthesized by hydrothermal method under the condition of adding tin tetrachloride as auxiliary agent.The influence of tin tetrachloride on the morphology of tungsten oxide was analyzed by adjusting the amount of tin tetrachloride under the same experimental conditions.The experimental results show that the smaller the size of tungsten trioxide is,the greater the amount of tin tetrachloride in the synthesis of tungsten trioxide will be.?2?The mixed solution of glycerol and water was used as the reaction solvent by solvothermal method,and organic acid was added as auxiliary agent.The tungsten oxide hydrates with different sizes and morphologies were successfully prepared.The results showed that the tungsten oxide prepared at 120 ?was orthogonal crystal system WO₃ H₂ O.FESEM analysis,and all of the prepared tungsten oxide nanomaterials were flake.The WO₃·H₂O nanoparticles prepared by adding oleic acid as auxiliary agent have the most complete morphology and the most uniform size distribution.?3?The self-assembled structure of tungsten oxide nanospheres and nanospheres were successfully prepared by solvothermal method,and the formation mechanism was analyzed briefly.There is a hollow microsphere structure in the self-assembled structure.Compared with other self-assembled structures,the structure has many advantages such as larger specific surface area and so on.?4?The photocatalytic properties of the prepared tungsten oxide nanorods and nanoparticles were tested by photocatalytic degradation of Rhodamine B solution.The experimental results show that tungsten oxide nanorods have better photocatalytic performance and adsorption performance,but the photocatalytic performance does not improve with the decrease of size,the adsorption of Rhodamine B on tungsten oxide nanoparticles was poor,and the degradation of Rhodamine B solution had no obvious catalytic activity when the experimental illumination time was relatively short,and showed strong catalytic activity after a certain time of reaction.ccording to the results of catalytic degradation of rhodamine B,the catalytic properties of tungsten oxide nanorods and nanorods were compared,and it was concluded that the catalytic performance of tungsten oxide nanorods was better.