Study On Synthesis And Photocatalytic Activity Of Transition Metal Doped TiO₂

Because water pollution is serious, the degradation of waste water treatment technology has beenwidespread concerned.Semiconductor photocatalysis has become increasingly promising technology in thewaste water treatment because it is low-cost and completes in the hazardous organic compoundmineralization.Titanium dioxide photocatalysis has been the focus of the investigations,particularly becauseof its high photocatalytic activity and its stability with respect to photocorrosion and chemicalcorrosion.However, because of its wide energy band, the absorption of light mainly concentrated in the UVzone,which led to a low utilization rate of sun light,and the specific surface area of Powder is small,noteasy recycled.In order to improve its use of visible light,Combined transition metal and titanium dioxide,Synthesised doped titanium dioxide photocatalyst,so that it not only possesses good photocatalytic Activity,but also able to reduce its width of energy band. And then,Because of their multiwalled nanotubularstructure,outstanding stability and oxidative capability,titanate nanotubes might have potential advantagesin many fields such as photocatalysis,hydrogen storage,sensors,solar cells and lithium cells.So nanotubehas attracted a lot of attention.Titanate nanotubes were synthesized under hydrothermal conditions.1.Using Ti（OC4H9）4as starting material,Zn²⁺and V⁵⁺doped Nano TiO₂powders have been preparedby Sol-gel method.Morphologies,structures and composing of the samples were characterized by X-raydiffraction （XRD）,Ultraviolet obvious spectrum （UV-Vis）,and scanning electron microscope （SEM）and soon.The results show that Zn²⁺and V⁵⁺can promoted the phase transformation from anatase to rutile,theabsorptive capacity of ultraviolet light is also enhanced,utilization efficiency of sunlight greatly increased.2.Using Co²⁺and V⁵⁺doped TiO₂as precursor. Co²⁺V⁵⁺doped Na2Ti3O7nanotubes were obtained byHydrothermal method.And studied hydrothermal reaction time and temperature.Morphologies,structuresand composing of the samples were characterized by X-ray diffraction （XRD）, Ultraviolet obviousspectrum （UV-Vis）,and scanning electron microscope （SEM） and so on. The photocatalytic reactivity wasevaluated by the degradation of reactive RB at the room temperature.The results indicate that the dopedNa2Ti3O7shows higher catalytic activity. 3. CdS/Fe³⁺-TiO₂and CdS/V⁵⁺-TiO₂nanotubes were obtained through partial ion exchange method.Morphologies, structures and composing of the samples were characterized by X-ray diffraction （XRD）,Ultraviolet obvious spectrum（UV-Vis）,and scanning electron microscope （SEM） and so on.The resultsindicate that CdS/Fe³⁺-TiO₂and CdS/V⁵⁺-TiO₂nanotubes have good photocatalytic activities.