The Synthesis And Performance Study Of TiO₂Nanocomposites

The oganics coulde be decomposed by photocatalytic material under the function of light, and the photocatalytics would stay the same. The most popular photocatalysts are Titanium dioxide (TiO2), zinc oxide (ZnO) and cadmium sulfide (CdS). In all of these, TiO2was studied most because of its non-toxic, stable chemical properties. Compared with the single TiO2, compound and mixed photocatalysts could improve the activities and broadenthe scope of applications. Compound material is a target of research. Phsyical characterization, study on photocatalytic activities were made on Fe3O4@TiO2magnetic photocatalysts and Graphene@TiO2compound photocatalysts. A further research on crystal planes, explain the influnce by morphology and size.Herein, a facile straight dipping approch was reported to construct magentic photocatalysts which containing sub10nm TiO2nanocrystals with two different morphologies. The photocatalytic performance of the magentic photocatlysts were examined by six different polluents degaretion reactions. A comparative studies has been carried out between TiO2nanoparticles and TiO2 nanorods, which demonstrates that catalyst containing TiO2nanorods with high surface energy show better photocatalytic performces than the catalysts containt TiO2nanoparticles. Furthermore, several Fe3O4@TiO2magnetic photocatalysts were prepared by sol-gel method, template method, hydrolysis method, as comparisions. Compared with the comparisions, the magnetic photocatalysts containing sub10nm TiO2nanocrystals show suporior photocatalysis activities due to the strong quantum size effect.Fe3O4@TiO2magnetic photocatalyst settled the problem of reccyle and dispersion. In this work, Graphene is also used to enhance the photocatalytic activity of TiO2.Afer a series of redox reaction, the natural graphite turned into graphene. Through a mild and simlpe dipping process, Graphene with TiO2nanocrystals were obtained. The photocatalysis activities were tested by the degradation of organics. The result turned out that the existence of Graphene could improved the activities of TiO2photocatalysts observably. And when the mass ratio of TiO2and Graphene is1:1, a perfet result would be obtained.