TiCl_3、TiCl_4共水解制备金红石相氧化钛粉体

Synthesis of Nanocrystalline Rutile Titania by Co-thermal Hydrolysis of TiCl_4 and TiCl_3 Solutions

通过TiCl3、TiCl4共同水解可以制备出金红石相的氧化钛粉体.改变原料浓度可 以控制产物的形貌,较高浓度下得到300—500nm的球状颗粒,由许多细小晶粒组成;较低浓 度下得到纳米针状颗粒.提高TiCl3的浓度可以使晶粒尺寸有所减小.

Nanocrystalline titania powders in the rutile phase were prepared by the homogeneous precipitation method using TiCl4 and TiCl3 as starting materials. The products were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM) analysis and BET surface area measurement. The solution concentration and the added amount of Ti3+ determined the properties of the obtained TiO2 powders. The photocatalytic activity of the powder was also studied by using the degradation of phenol in water as a test reaction. It shows higher photocatalytic activity both in degradation rate and in degradation efficiency, probably due to the ultrafine particle size, higher specific surface areas and more active surface groups for physicochemical adsorption.