Syntheses And Characterrization Of Nano-titania Composites

Nano-titanium dioxide has been widely used in various fields because of its unique physical and chemical properties, especially in the field of photocatalysis. However, there are many defects of titanium dioxide in the practical application. The photocatalytic performance and efficiency of utilization of solar energy are relatively low in the practical application. In this paper, series Fe3+/Ag+-doped nano-titanium dioxide were prepared by sol-gel hydrothermal method. The photocatalytic degradation performance was investigated. The effect of p H on the hydrolysis of Ti Cl4 was explored.Fe3+, Ag+ and Fe3+/Ag+-doped nano-titanium dioxide were prepared by sol-gel hydrothermal method, respectively. The products were characterized by UV-VIS, XRD and SEM. The results show that all of the products are anatase and rutile Ti O2. Compared with that of Ti O2, the critical absorption wavelengths of Ti O2-Fe3+ and Ti O2- Fe3+/Ag+ take red shifts to 421 nm and 418 nm, while that of Ti O2-Ag+ blue shift to 368 nm. The results of the photocatalytic degradation on methyl orange experiment show that Ti O2-Fe3+/Ag+ has the best of photocatalytic degradation performance in the three products.A simple technology processing using Ti Cl4 as raw material at low temperature to prepare different nano-sized Ti O2 powders at different p H conditions was presented. The products were characterized by XRD and TEM. The results show that the products are rutile Ti O2 at strong acid condition, anatase and rutile mixed Ti O2 at weak acid condition and amorphous Ti O2 at neutral and alkaline condition. The crystal of nano-sized Ti O2 are 20~40 nm in size. The results of the photocatalytic degradation of methyl orange experiment show that anatase and rutile mixed Ti O2 by calcination have the best photocatalytic degradation performance.