*2.1. Raw Materials*

Samples were prepared using commercial Portland white cement type I from the Colombian company Cementos Argos. The Titanium Oxynitride (TiO2í*x*N*y*) and Titanium Dioxide (TiO2), commercial references were provided by Chinese NaBond Technologies Co. (Shenzhen, China) and German companies Evonik-Degussa (Essen, Germany), respectively. In turn, according to the manufacturer, the TiO2í*x*N*y* has 22% Nitrogen in its structure. The Rhodamine B was provided by the Colombian enterprise Codim. Table 1 shows the specifications of each nanoparticle and the crystalline phases and semi-quantitative estimations using X-ray diffraction (XRD, Phillips X'pert).


**Table 1.** Characteristics of nanoparticles added.

\*According to the manufacturer's specifications; \*\* Semi-quantitative estimation by XRD.
