Nitrogen-doped TiO2 was synthesized by a simple wet method using a nitrogen precursor hydrazine hydrate and nano TiO2. This photocatalyst was characterized by X-ray diffraction, high-resolution transmission electron microscopy, diffused reflectance spectra, photoluminescence, and X-ray photoelectron spectroscopy. XPS analysis indicates the incorporation of anionic nitrogen in TiO2 lattice as O-Ti-N linkage. N2 adsorption– ...