TiO₂ Nanofibers Photocatalytic Synthesis Of Ammonia

Nano-titanium dioxide compared with other semiconductor materials,can catalyze a variety of pollutants,and the reaction conditions are mild,simple operation,is widely used in waste treatment,air purification and other fields,with high catalytic activity,chemical stability and other advantages,is a very promising solar photocatalyst.However,titanium dioxide as a photocatalytic material,there are more obvious shortcomings:First,titanium dioxide powder size is small,difficult to recover,and its bandgap width?Eg = 3.2 e V?,only in the ultraviolet light can be excited,can not fully use solar energy;Second,Photogenerated electrons and holes are easy to compound,photoelectron effects are poor,and these adverse factors limited the extensive application of titanium dioxide.TiO₂ nanofibers were fabricated using mesoporous silica spheres as template,titanium tetrachloride as precursor.which not only solved the problem of recovery,photogenerated electrons and holes recombinated,but also through Fe,V and N doped,broadening the range of light response to the visible region,has a very important significance.The experimental results show that the TiO₂ nanofibers are anatase and the diameter is 7-10 nm.The result of synthesis of ammonia under ultraviolet light shows that the photocatalytic activity of the fibers are higher than P25.After the amorphous alloy?Ni-Mo-B?modified nanofibers,the fluorescence intensity reduced,the absorption intensity of visible light is further enhanced,and the crystal morphology and morphology of the fiber are not changed,and the yield of synthesis of ammonia is also improved.In order to improve the photocatalytic activity of TiO₂ nanofibers under visible light,the fibers were modified by single ion and co-ion.The experimental results showed that the morphology and shape of the fibers were not changed through were modified by single ion N,Fe and V.But the fluorescence intensity decreased,the absorption band was red shift,and the yield of synthesis of ammonia was greatly improved.After the co-doping modification,the characterization results are better than that of single doped,and the photocatalytic activity of the fibers is further improved.