Papers by Keyword: Rutile Titania

Abstract: Vanadium doped rutile titania was prepared by low temperature hydrolysis using Tetrabutyl titanate as raw material. Powers were characterized by X-ray diffraction spectrum (XRD)、diffuse reflection spectra(DRS)、fluorescence spectra (FS). At 1073K, Doped concentration have been in a certain range, Vanadiumcould be doped into the lattice of rutile TiO₂ in the way of replacement, which would cause no change in rutile TiO₂crystalline state with sunlight as the light source, pH=6.0, catalyst concentration was 1.0g.L^-1, concentration of methyl orange was 5.0mg.L^-1. It has been shown that Vanadium doped TiO₂powders(1.0%,1073K) has been the most photodegradation efficiency, and the degradation efficiency was 97.2% after 6h.

Abstract: In this paper, W-doped rutile titania was prepared by low temperature hydrolysis using Tetrabutyl titanate. Powers were characterized by XRD、DRS、PL. At 1073K, Doped concentration have been in a certain range, Tungsten could be doped into the lattice of rutile TiO₂ in the way of replacement, which would cause no change in rutile TiO₂ crystalline state with sunlight as the light source, pH=2.0, catalyst concentration was 1.0g.L^-1, concentration of methyl orange was 5.0mg.L^-1. It has been shown that Tungsten doped TiO₂ powders(1.0%,1073K) has been the most photodegradation efficiency, and the degradation efficiency was 96.8% after 12h.

Abstract: Rutile TiO2 nanoparticles have been synthesized by direct hydrolysis method using TiCl3, TiCl4 as starting materials, yielding two different morphologies. The hydrolysis of TiCl3 resulted in needlelike rutile titania with the specific surface area of 74.5m2/g, while round particles about 200~400 nm with small acicular at edge, with specific area as high as 175m2/g, were obtained using TiCl4 as starting materials. The precipitates from TiCl4 hydrolysis could be changed into anatase phase without filtering and separation by varying pH of the system. The phenomenon was explained from the viewpoint of structure. The photocatalysed properties of rutile powders were compared with those of anatase of the same specific surface area. Rutile powders with initial crystalline size of 7 nm were found to have higher photocatalysed activity in the phenol degradation reaction than that which anatase has. The high activity of the as prepared lab-made rutile was attributed to the abundance of hydroxy groups in powders, which was proved by TG data, making the degradation reaction have more active sites. The agglomeration form of the rutile powder makes it easy for separation and reuse.