Research On Preparing Ferrum-doped Titanium Dioxide Nanotubes And The Property Of Photocatalysis And Electrical Property

In recent years, with the rapid rise of industry and the development of science andtechnology, the semiconducting material of titanium dioxide comes into our horizonsbecause of its advantages of cheap, nontoxic and stable structure. Titanium dioxide is notonly an excellent pigment, but also an outstanding photocatalyst with higher efficiency. Inaddition, it is also a lithium ion anode material with high voltage of charging anddischarging. But as a photocatalyst, the band of energy is wide, which leads to selectivelight wave, and as a lithium-ion cathode material, the theoretical special capacity isrelatively low. In view of above shortcomings, we improve the electrochemical propertiesand catalytic activity through the study of modification with doping.(1) We use tetrabutyl titanate as the source of titanium, and prepare titanium dioxide bythe method of sol-gel by adding different concentrations of iron as doped substances. Thecourse includes the preparation of sol-gel, drying, calcining and the process of hydrothermalreaction in alkaline solution. We study the morphology, photocatalytic activity andelectrochemical performance by controlling the doping amount, calcining temperature,calcining time(2) By X-ray diffraction (XRD), transmission electron microscopy (TEM) and EDScharacterization analysis, we study different factors which affect the titanium dioxidenanotubes such as doping concentration, calcining temperature, calcining time. The resultshows that: when the concentration of Fe is1.5%, and the sample is calcined at500℃for3.5h, the sample length is about100nm, and the mixed crystal of rutile and anatase.(3) On the basis of physical characterization, we conduct single factor analysis to studydifferent factors on the properties of catalytic effect such as doping amount, calcinationtemperature and calcination time. We also design orthogonal experiment to determine thebest process parameters, the result shows that when the concentration of Fe is1.5%, and thesample is calcined at500℃for3.5h, the degradation rate of methyl blue is98.8%inmercury lamp after60min. (4) Comparing the lithium performance of titanium dioxide of samples with dopingand non-doping, the result shows that the sample that doping Fe-1.5%reveals excellentlithium electricity performance. It shows specific capacity of265mAh/g in the first circle at0.2C, after100cycles, the capacity remains195mAh/g. But high dose of the existence foriron ion will affect the surface of the crystal, and the course of embedded andde-intercalation, which affect diffusion of ion diffusion.