Effects Of Sintering Atmosphere On Phase Transformation And Photocatalysis Behaviors Of Fe-doped Titania

Titanium dioxide as a photocatalyst has received much attention in the field ofphotoelectric conversion and photocatalysis. However, it has low solar energy utilization.Furthermore, easy recombination of photo-induced electrons and holes results in lowquantum yield. These factors limited the application of TiO2in practice. Concerning theissues for TiO2as a photocatalysis, Fe-doped titania sols were prepared by sol-gel method,then they were sintered at different temperature and different atmosphere in this work,Phase composition and lattice parameter of titania powders were analyzed by an X-raydiffraction method; photocatalytic ability of the powder was analyzed by visiblespectrophotometer.Sintering atmosphere, sintering temperature and iron doping of TiO2phase change and the influence of photocatalytic performance were studied.Results show that doping ferric iron could prohibit crystal transformation fromanatase to rutile, change the grain size and morphology. The amount of Fe-doped was0mol%-0.8mol%, the transition temperature of anatase to rutile is450℃in oxidationatmosphere; The iron ion completely enters in the lattice of titania by the form ofsubstitution in the reduction atmosphere. The amount of Fe-doped was0mol%-5mol%,with doping ferric iron increased the transition temperature of anatase to rutile from450℃rised to500℃; Sintering temperature was increased can promote the crystallizationof large Fe-doped TiO2powder in reduction atmosphere. Using methylene blue as theobjective contamination to make a photocatalytic degradation experiment, and the resultsmanifest that the titania powder with Fe-doped has better photocatalytic ability than thepure one. when the molar ration is5mol%，the photocatalysis effect is best in reductionatmosphere.