by using a high-speed ball milling of P25 TiO2 with
nitrogen source such as ammonia solution, hexamine and urea that reported by R. Rattanakam et al.
(2009), can absorbed light of wavelength up to 545 nm. Although the particle from mechanochemical
method were agglomerated. Nitrogen-doped TiO2 has been prepared by sputtering, ion implantation,
chemical vapor deposition, sol-gel, oxidation of TiN, derect nitridation of TiO2