Abstract: With tetrabutyl orthotitanate and nickel(Ⅱ) chloride hexahydrate as original materials and cetyltrimethylammonium bromide as a template agent, Ni-doped TiO₂ mesoporous material was successfully prepared by solid-state reaction. The textural properties of the materials were characterized by the X-ray diffraction, high resolution transmission electron microscope (HRTEM), N₂-physisorption at 77K, fourier transform infrared spectroscope (FTIR), Raman spectroscope and ultraviolet visible light spectroscope. The components of Ni-TiO₂ were determined by inductively couple plasma atomic emission spectrometry. The photodegradation properties of this material for methyl orange were detailedly investigated. The results show that nickel is incorporated into the framework of TiO₂ with content of 3.62wt%. Furthermore, Ni-doped TiO₂ with anatase phase is laced the wall with the amorphous grain boundary and crystallite with some defect structures and nickel oxides. For Ni-doped TiO₂ mesoporous material, the specific surface area of 102.4m²/g and the pore radii distribution centre of 2.4nm are obtained. At 298K, the rule of pseudo-first-order reaction and the concentration effect are found in the photodegradation process of methyl orange on the Ni-doped TiO₂ mesoporous material surface, where the reaction rate constant is two times higher than that on pure TiO₂.

Key words: Ni-doped TiO₂, mesoporous material, solid-state reaction, methyl orange, photodegradation, kinetics