**4. Conclusions**

The addition of TiO2í*x*N*y* nanoparticles to cement gives the ability to abate organic compounds present on the cementitious matrix, thus giving cement the attribute of being able to destroy contaminants by irradiating them with visible and UV light. With the best performance, samples with 3% TiO2í*x*N*y* showed a similar behavior to 3% TiO2 samples under UV irradiation. On the other hand, the results under visible light were different; the samples with TiO2 did not show photocatalytic activity. In turn, these samples obtained a minimal abatement of dye by reactions of photolysis or thermolysis, and, possibly, a shielding effect was observed that prevented the photonic absorption in the pigment. In addition, the specimens with 3% of TiO2í*x*N*y* obtained the highest photoactivity, and the samples with 1% of TiO2í*x*N*y* showed a similar behavior to the control samples.

Cements with added TiO2í*x*N*y* nanoparticles show potential to be applicable in the construction of photocatalytic structure, which can take advantage of much of the solar spectrum and artificial lighting for the degradation of organic pollutants present in these.
