SYNTHESS OF NANOSTRUCTURED ANATASE WITH HIGH TEMPERATURE STABILIZATION FORPHOTOCATALYST ANDANTBACTERAL APPLICATIONS

Titania, especially anatase, is attractive due to its photocatalyst and antibacterial applications. It is important to stabilize anatase phase at high temperatures. In this study, nanostructured anatase was prepared by polymeric sol-gel method without any additives, using titanium tetraisopropoxide (TTIP), isopropanol (IPA), HCl and H2O. Stable polymeric titania sol was first prepared by establishing the proper values of the acid/alkoxide and the waterialkoxide molar ratios and subsequently heat-treatment to produce nanocrystalline anatase. The properties of sol were determined by dynamic light scattering (DLS) and Zetasizer. Then physical properties of nanostructured titania were investigated by differential thermal and thermogravimetric analysis (TG-DTA), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The activities of the resultant photocatalyst anatase were evaluated using methyl orange. The results of DLS showed that particle size distribution of polymeric sol is in the 0.6-1.5 nm range. The samples calcined at different temperatures showed crystalline structure of anatase phase. Nanocrystalline titania had high thermal stability against phase transformation from anatase to rutile up to 750 °C and crystallite size of anatase calcined at 400-750 °C was in the range of 10-50 nm. The prepared nanostructured anatase in this research also showed an acceptable photocatalytic activity.

کلیدواژه ها:

TiO2 ، Nanostructured Anatase ، Polymeric Sol ، Photocatalytic