An Investigation Of Controllable Preparation Of ZrO₂ And Zr-Ti-O Nanoparticles And Their Applications In Photodgeradation For Alizarin Red S

The morphology, crystalline, and component of nanoparticles are greatly influence the various properties of nanoparticles, in particular the morphology. So the controllable preparation of nanoparticles is of importance to adjust their performance and applications. In this thesis, ZrO2 and Zr-Ti-O nanoparticles were prepared by several general preparation methods of in liquid phase, homogeneous precipitation method and hydrothermal synthesis method based on their simplicity and effectiveness, and characterized by DG/DTA, SEM, TEM, XRDand DLS etc. photocatalytic capabilities of some as-prepared ZrO2 nanoparticles and Zr-Ti-O nanocomposites were tested by a dye-alizarin red S. some interesting results were reported as the followings.1. ZrOCl2·8H2O as a reaction precursor and urea as an organic precipitant, ZrO2 nanopartilcles with small size were prepared by the homogeneous precipitation method. The concentration of the hydrothermal-derived precursors, the proportion of the added urea, the hydrothermal temperature and reaction time were studied in detail. The crystal transfer and morphology of zirconium dioxide were also investigated.2. ZrOCl2·8H2O as the reaction precursor, L-amino acid (such as L-lysine, L-arginine, L-threonine, L-histidine), ammonia and urea as organic precipitants, a very small sized ZrO2 nanoparticles were prepared with good dispersion via the hydrothermal synthesis method. The concentration of the hydrothermal precursors, the added proportion of precipitants, the hydrothermal temperature and the reaction time were fully investigated to understand the crystal transfer and morphology of zirconium dioxide.3. ZrOCl2·8H2O and TiCl4 as the reaction precursors, L-arginine as an organic precipitant, Zr-Ti-O nanocomposites nanoparticles were prepared via a hydrothermal synthesis method. The concentration of the hydrothermal-derived precursors, the added amount of TiCl4 and L-arginine, the hydrothermal temperature and the reaction time were investigated in detail to understand the crystal transfer and morphology of Zr-Ti-O nanocomposites.4. The photocatlytic capabilities of the as-prepared ZrO2 nanoparticles and Zr-Ti-O nanocomposites were studied by spectrophotometry. The photocatalytic activities of both ZrO2 and Zr-Ti-O nanocomposites for the organic dye-alizarin red S were high under UV irradiation.