Preparation and Investigation of TiO2 Sol Containing Nanometer Anatase Crystalline Grains
TiO2 sol containing nano anatase crystalline grains was prepared using Ti(OC4H9)4 as a precursor in a water-excessive reaction system. The processes of hydrolytic-polymeric reactions and the structures of the products were analyzed. It was found that the -OC4H9 radicals previously linked to Ti atom in Ti (OC4H9) 4 molecular are broken, and there is no organic radicals linked to Ti atoms in the final sol. The structure of particles in the sol changes along with time from tetrahedral [TiO4] to octahedral [TiO6], with the coordination number changing from 3.14 to 5.18, accordingly. Therefore, the structure becomes closer to an anatase, which is octahedral [TiO6] with a coordination number of 6.0. Transmission electron microscope micrograph also reveals the foursquare projection shape of crystalline grains with a size of 200 nm in the sol. As the particles in the sol have a quasi anatase structure, the TiO2 sol can directly photodegrade Rhodamine B under Ultraviolet illumination with a rate of 62.35%.
Wei Pan and Jianghong Gong
J. W. Gao, Q. H. Shen, M. Fang, P. Wang, L. Li, "Preparation and Investigation of TiO2 Sol Containing Nanometer Anatase Crystalline Grains", Key Engineering Materials, Vols. 336-338, pp. 2350-2352, 2007