Study On Preparation, Characterization And Photocatalytic Propeties Of Fe～(3+)/(W～(6+), La～(3+)) Co-Doped Nano-TiO₂

Studies on co-doped TiO₂ particle by choose suitable metal ions, thepeople find that the synergetic effect between the ions can effectivelyseparate the electron and cavity. Accordingly, the photocatalytic activityof the co-doped TiO₂ particle is greater than the single element dopingTiO₂ particle. In this paper, we adopt sol-gel method to prepare Fe³⁺ andW⁶⁺ or Fe³⁺ and La³⁺ co-doped nano-TiO₂ photocatalyst. It wascharacterized by XRD, SEM, FT-IR and PL. The photocatalytic activity isstudied with methyl orange as objective infectant. The analyse result ofSEM and XRD indicate that the figure of co-doped nano-TiO₂photocatalyst is sphericity primarily. The particle size of TiO₂ is about20nm and the crystalline phase is anatase. The exterior of the particleabsorb a great deal of water molecule and hydroxy group. The co-dopednano-TiO₂ particle did not arose new fluorescence. It bring the synergeticeffect between the Fe³⁺ and W⁶⁺ or Fe³⁺ and La³⁺ and restrain the complexof the electron and cavity availably. The expeiment of the photocatalytic activity of the photocatalystindicate that Fe³⁺/W⁶⁺ or Fe³⁺/La³⁺ is greater than the pure or the singleelement doping TiO₂ particle. The degradation rate of methyl orangeexcess 85% under the low-pressure mercury lamp for 60 minutes. Whenthe concentration of Fe³⁺ and W⁶⁺ or Fe³⁺ and La³⁺ is 0.05 % and 0.04% or 0.05% and 0.03%, the degradation capability of the catalyst isoptimal. The degradation rate of methyl orange excess 94%.In this paper, we also adopt hydrothermal method to prepare TiO₂nanobelt. Its output is very high and its main thickness is in the range of20～50 nm. The length is up to tens of micrometer. TiO₂ nanobelt iscomprehensive of anatase, rutile and brookite. After calcined at 300℃thequantity of rutile increase, the shape of belt was remained very good. Theresult of the degradation experiment show that the TiO₂ nanobelt have agood photocatalytic activity, and the degradation rate of methlic excess86%.