TiO_2 nanopodwers were prepared with titanium tetrabutyloxide as the precursor by a solvothermal process. The prepared products were characterized by X-ray diffraction (XRD) and transmission electron microscope (TEM). The photocatalytic properties of the prepared samples were evaluated by measuring the degradation of o-nitrophenol. Transmission electron microscope (TEM) showed the prepared product contains sphere particles with a size of 920nm. HR TEM image further reveals that the sphere particles disp...