The application of semiconductor materials with metal ions shows an interesting alternative for the treatment of organic effluents, including high recalcitrance. In this paper, Fe/TiO₂ (2 and 5%wt) was synthesized by impregnation method, calcinated in three different temperatures (250, 300 and 400°C) and used for discoloration of reactive dyes solutions under artificial and solar lights. For the material characterization, techniques N₂ adsorption measurements (BET method), X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive X-ray (EDS), thermogravimetric analyzer (TGA), temperature programmed reduction (TPR) and photoacoustic spectroscopy (PAS), were used. The photocatalyst 2% Fe/TiO₂ under solar irradiation, in general, was more efficient in the discolored dye reactive aqueous solutions. Furthermore, the discoloration ratios are strongly influenced by the calcination temperature. For each dye, the highest discolorations were: 88.35% employing 5% Fe/TiO₂ (250°C) against reactive yellow-145, 87.50% employing 2% Fe/TiO₂ (250°C) against reactive orange-122 and 20.91% employing 2% Fe/TiO₂ (250 and 300°C) against reactive blue-19. This study also examined the implementation of support vector regression (SVR) for the prediction of the photodiscolorization for the reactive dyes solutions. The input parameters to the algorithm were dye reactive, temperature calcination, reaction time, metallic charge and surface area, and the output was dye discolorization. The result in terms of root mean squared error (RMSE) was 96.1271%, which agrees almost perfectly with the experimental results data.

impregnation, photocatalysis, discoloration, characterization, support vector regression.