[en] Photo catalysis is a method widely used in the degradation of organic pollutants of the environment. The development of new materials is very important to improve the photo catalytic properties and to find new applications for TiO₂ as a photo catalyst. In this article we reported the synthesis of a photo catalyst based on TiO₂ doped with Zn²⁺ ions highly efficient in the degradation of nitrobenzene. The results of photo catalytic activity experiments showed that the Zn²⁺ doped TiO₂ is more active that un-doped TiO₂ catalyst with an efficiency of 99% for the nitrobenzene degradation at 120 min with an apparent rate constant of 35 x 10^-3 min^-1. For the characterization of photo catalyst X-ray diffraction, transmission electron microscopy and Raman spectroscopy were used. (Author)