Study On The Photocatalytic And Dispersion Properties Of Phosphorus-doped Modified Titanium Dioxide

In recent years,the contradiction between energy shortage and environmental protection issues has become increasingly prominent,and the problem of environmental pollution has become increasingly serious.At present,nano-photocatalytic oxidation technology as a green clean and environment-friendly technology,because it can quickly and efficiently decompose toxic and harmful pollutants into non-toxic and harmless substances,and has been widely favored by scientific researchers.Among them,TiO2 nanoparticles have become one of the most promising photocatalysts due to their advantages of high efficiency,low cost,and long lasting effects.Photocatalytic oxidation technology uses pure,pollution-free and inexhaustible solar energy,and thus has enormous economic and social benefits in areas such as environmental governance.However,the pure nano-TiO2 itself has its limitations,its band gap is about 3.7eV,can only use ultraviolet light with a wavelength of less than 387nm,so the utilization of sunlight is extremely low.Therefore,at present,nano-TiO2 can not exert its photocatalytic effect at night,indoor,tunnel and other places where sunlight cannot be irradiated.In addition,the disadvantages of nano TiO2's inability to disperse evenly in aqueous solution are particularly prominent,which greatly limits its application in the fields of multifunctional coatings,self-cleaning materials,sterilizing materials,and photocatalytic materials.In this dissertation,phosphorus-doped nano-TiO2 was prepared by a two-step method at room temperature.By controlling the conditions of the introduction of the phosphorus source,phosphorus-doped nano-TiO2 powders with different phosphorus sources,different phosphorus-titanium ratios,and different soaking times were prepared.The prepared samples were tested by XRD,XPS,SEM,etc.The results showed that the phosphorous-doped modified nano-TiO2 obtained at room temperature has the characteristics of small particle size and high catalytic activity.Through the photocatalytic degradation test of organic methylene blue in aqueous solution,the preparation conditions and process of optimal phosphorus doping modification were discussed.Phosphorous doped modified nano TiO2 with extremely high visible light catalytic activity was obtained at room temperature.The application of TiO2 in indoor and other non-ultraviolet light conditions provides the basis.In addition,this study also studied the difficult dispersion of titanium dioxide,and adjusted the conditions for uniform dispersion of modified nano-TiO2 in aqueous media by adjusting various factors such as the type and pH of the surface-modified polymer,and deepening the related fields in the future.Research and practical application provide basis and reference.