Preparation Of Metal Iron-Doped Nano-TiO₂ And Study On Its Surface Modification

As a well-known optoelectronic semiconductor with photoelectrochemical and photocatalytic activity, TiO₂ is considered to be an effective and nontoxic photocatalyst for atmosphere cleaning and water purification. Light of wavelength shorter than 387.5nm can be absorbed since the energy gap of TiO₂ is 3.2eV. Its energy conversion efficiency is much lower than the present commercial level, so research of photocatalytic efficiency has been an important subject in TiO₂.Nanometer TiO₂ was prepared by co-precipitation and titantium polymerization in this paper, with its physical and chemical properties characterized by XRD,SEM,TG-DTA,IR. The test showed the grain size of TiO₂ particle was about 20nm in co-precipitation way and one-dimension in nanometer range, with its surface closely arranged in titantium polymerization method. In this paper we reported titantium polymerization to synthesize nano-TiO₂ only by controlling the volume of water and temperature. And more this method was well for industrial production, because it did not pollute.Fe³⁺,Cu²⁺,Zn²⁺ iron-doped nano-TiO₂ was prepared by co-precipitation way and titantium polymerization method. The experimental results showed 0.4mass% Fe³⁺ iron-doped nano-porous titanium dioxide enhanced the photocatalytic activity strongly before 400nm by UV-Vis transmittance spectra, and from 400nm to 850nm, the photocatalytic efficiency was also enhanced a little. The photocatalytic of active carbon supported TiO₂ powders was prepared by titantium polymerization method, was modified by doping Fe³⁺. The results showed 0.4mass% Fe³⁺ iron-doped titanium dioxide supported by active carbon enhanced the photocatalytic activity between 250nm and 500nm by UV-Vis transmittance spectra. Furthermore, it was discovered that methyl orange can be degraded 96.8% by 350W UV radiation for 30min.The hyhrophilic and oil-soluble of nano-TiO₂ particles were prepared. The results showed that nano-TiO₂ particles can disperse well in water only by controlling pH from 4 to 4.5 and adding 4mass% dodecylbenzenesulfonic acid sodium salt(DBS), and in the toluene by controlling TiO₂ and OA molar ratio of...