Synthesis And Properties Of Novel Titanium Dioxide Nanomaterials

As a typical n-type semiconductor, TiO2have extensive applications in many fields especially in photocatalysis, gas sensors, coatings, self-cleaning materials and solar cells. In recent years, many studies have been carried out on the synthesis and application of TiO2. The properties of TiO2not only depend on its composition and crystal structure but also on the particle size, morphology and microstructure.The main goal of the dissertation first is synthesize novel nano-structured TiO2materials and explore the relationship between the formation mechanism, microstructure and its properties. Second is laboratory simulation of the industrial titanyl sulfate solution hydrolysis process, by regulating the hydrolysis conditions, investigating the effects of different experimental conditions on the final product. The detailed information of the dissertation is listed as follows:1. Facile synthesis of annular TiO2and its enhanced visible light photocatalytic activityThe blue tetragonal bipyramidal TiO2, which shows an enhanced absorption in the visible-light region, was solvothermally synthesized using TBOT as raw material and the mixture of TFA-H2O as solvent. Size control of the anatase TiO2nanocrystals was achieved by adjusting the amount of water. Then, via a facile etching process by HF, annular TiO2with superior visible light photocatalytic activity on the degradation of RhB under certain conditions were obtained.2. Preparation of rutile TiO2powders from industrial titanyl sulfate solution with TiCl4hydrolysis seeding additionRutile TiO2powders were prepared from industrial titanyl sulfate solution with TiCl4sol as seed. The effects of different hydrolysis conditions on the particle morphology and structure were investigated using XRD, TEM and particle size distribution analysis. XRD and TEM results showed that the morphology and size of the final product were influenced by the hydrolysis seed, the hydrolysis and the calcination conditions.