Nano Tio <sub> 2 </ Sub> Preparation, Doping, Load And Its Photocatalytic Activity

At recent years, the semiconductor photo-catalytic oxidation technique applied in degradation of environment pollution is one of the researching hotspot by environmental investigator in the whole world; namo-TiO2 has been the focus of the investigations, particularly because of its advantages of stability, low cost, high photo-catalytic efficiency and extensive application.In this paper, the Nano-TiO2 powder, Fe3+/TiO2 powder by sol-gel method and Fe3+/TiO2 film on glass by dip-coating method was prepared, the photo-catalytic activity was evaluated by using 4-fluorobenzoic acid as an objective degradation organic under UV, and the influencing factors of photo-catalytic degradation by using Fe3+/TiO2 film on glass was investigated.Firstly, using tettrabutry titanate as precursors, the Nano-TiO2 powder was prepared by sol-gel method, different added amount of H2O and acetyl acetone influence sol-gel time was studied; Nano-TiO2 powder was prepared at different calcinating condition, TG-DTA, XRD and TEM was used to characterize the Nano-TiO2 powder, the effect of crystal changed, growth of crystallite and particle size at different calcinating condition was reviewed. The photo-catalytic efficiency of Nano-TiO2at different calcinating condition was evaluated.Secondly, the Nano-TiO2 doped Fe3+ powder was prepared by sol-gel method, TG-DTA, XRD, TEM and UV-Vis was used to characterize the Fe3+/TiO2 powder, the effect of crystal changed and particle size of different Fe3+ doping ratios Fe3+/TiO2 was reviewed, and the photo-catalytic efficiency of different Fe3+ doping ratios Fe3+/TiO2 powder was evaluated.The different thickness of Fe3+/TiO2 film on glass was prepared by dip-coating method, the different added amount of PEG-400 and speed of hoist influence quality of film was studied; The photo-catalytic efficiency of different thickness of Fe3+/TiO2 film on glass and its iterative used was discussed, and the reactions carried out by suspensions of Nano-TiO2, Fe3+/TiO2 powder and immobilize Fe3+/TiO2 thin film on glass was also discussed.Finally, photo-catalysts degradation of 4-fluorobenzoic acid by Fe3+/TiO2 film on glass was investigated, the influencing factors of photo-catalysts degradation such as light-intensity, different amount of photo-catalysts, concentration, pH, DO and adscititious oxidant was investigated; the result indicate that the rate of photo-catalysts degradation can be expressed in first-order kineticsmodel and it is keep to Langmuir-Hinshelwood kinetic equation.