In this manuscript, the nitrogen-doped TiO2 samples were prepared by hydrothermal method and
treating with nitrogen source. The result product from hydrothermal method was hydrogen titanate which
will be used as starting material. After that, it was stirred with difference concentration of N source (0.5,
1.0 and 2.0M) from difference N sources; i.e., urea and guanidine carbonate. The as-synthesized of
nitrogen-doped TiO2 was followed by heat treatment at 400