Cement plate with addition of this photocatalyst TiO2-N,C/300 had the best photocatalytic activity during photosensitized oxidationof dye and because of that also additional study were done and different amount of %weight (1, 5 and 10%) of photocatalyst was mixed with cement. The energy band gap of photocatalysts was calculated by using Kubelka–Munk function and data in Table 4 were placed.