Effect of Calcination Temperature on Light Absorption and Visible Light Photocatalytic Activity of N Doped TiO₂ Nano-Crystalline

N doped TiO 2 nano-crystalline was prepared through hydrolysis-precipitation process in the presence of ammonia water. The resulting materials were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS). It was found that N was incorporated into the lattice of TiO 2 through substituting lattice oxygen atoms and coexisted in the forms of substitutional...