Study On The Preparation And Photocatalytic Performance Of N-Doped Titanium Oxide Films With Metal Modification

Titanium dioxide is one of the most widely studied semiconductor photocatalysts with the advantages of high photocatalytic activity, competitive price, corrosion resistance, which has be used in photocatalytic degradation of pollutants, bactericide, self-cleaning surface, et al. However, it can just absorb ultraviolet light as which has a wide band gap, its quantum efficiency is also very low. These deficiencies limit the application of titanium dioxide. In this paper, visible-light photocatalysis properties of nitrogen-doped titanium dioxide films with metal (Fe and Ni) modification are studied on, especially in terms of the role played by metal modification. Nitrogen doped titanium dioxide films with metal (Fe and Ni) modification were prepared by magnetron sputtering. The influence of doping nitrogen and various amount of Fe/Ni on structure, feature, surface chemical state of element, optical absorption properties and photocatalysis were investigated. The results are list as following:The grains of nitrogen doped titanium dioxide films with Fe modification are few tens of nanometer. After doping nitrogen and Fe modification, the particle size decreases, but increases along with the amount of Fe increasing. And after Fe modification, rutile TiO2 transform into anatase TiO2· In addition, the surface becomes rough and loose. Fe atom existed in the form of Fe3+ in N-Fe-TiO2. They prompted that Ti4+ transformed into Ti3+ and lattice distortion. The crystallization of the film is enhanced after annealing. And the visible light absorption of annealed sample is enhanced.The grains of nitrogen doped titanium dioxide films with Ni modification are few tens of nanometer. After Ni modification, the particle size decreases then increase, which were consisted of anatase TiO2. Ni atom existed in the form of Ni2+in N-Ni-TiO2.They prompted that Ti4+ transformed into Ti3+ and lattice distortion.The intrinsic absorption of nitrogen doped titanium dioxide films with metal (Fe and Ni) modification are changed. As the amount of Fe is 3.0 at.%, UV-Vis absorption edge moves to 410nm. As the amount of Ni is 4.8 at.%, UV-Vis absorption edge moves to 450nm. The optimum content of Fe is 1.5 at.%. The RhB degradation percentage of nitrogen doped titanium dioxide films with Fe modification is 48.17%during 2h. The optimum content of Ni is 0.7 at.%%. The RhB degradation percentage of nitrogen doped titanium dioxide films with Ni modification is 45.86% during 2h.