On 304 stainless steel substrates, two combined systems based on silver particle semiconductors, Ag/TiO₂ and Ag/SiO₂, were formed. Such systems were applied in the photocatalytic degradation, profiting from sunlight, of nitrosamines, which are highly toxic substances, specifically N-Nitrosodiethanolamine. The synthesis of TiO₂ and SiO₂ was carried out by the sol–gel method with co-precipitation of Ag metallic particles, adding a quaternary-ammonium-based ionic liquid as a reducing agent. The photocatalysts were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD), confirming the integration of anatase-phase TiO₂ and amorphous-phase SiO₂ and the Ag cubic structure. The band gap width was determined by means of the Tauc graphical method, finding 1.7 eV and 1.8 eV for SiO₂ and TiO₂, respectively. The photocatalytic evaluation occurred under direct sunlight irradiation, achieving degradation efficiencies above 98% during the first 30 min; in addition, organic matter was quantified through the chemical oxygen demand (COD) technique.

On 304 stainless steel substrates, two combined systems based on silver particle semiconductors, Ag/TiO₂ and Ag/SiO₂, were formed. Such systems were applied in the photocatalytic degradation, profiting from sunlight, of nitrosamines, which are highly toxic substances, specifically N-Nitrosodiethanolamine. The synthesis of TiO₂ and SiO₂ was carried out by the sol-gel method with co-precipitation of Ag metallic particles, adding a quaternary-ammonium-based ionic liquid as reducing agent. The photocatalysts were characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and x-ray diffraction (XRD), confirming the integration of anatase-phase TiO₂ and amorphous-phase SiO2 and the Ag cubic structure. The band gap width was determined by means of the Tauc graphical method, finding 1.7 eV and 1.8 eV for SiO₂ and TiO₂, severally. The photocatalytic evaluation occurred under direct sunlight irradiation, achieving degradation efficiencies above 98 % during the first 30 min; in addition, organic matter was quantified through the chemical oxygen demand (COD) technique.