[en] Full text: Electrospinning is a common and affordable method used to manufacture a large number of fibers with reduced diameters using high voltage electric fields where a jet of fluid material is ejected, producing the fibers. The fibers have high surface/volume and can have new features, like high mechanical performance, depending the type of polymer, presenting high capacity to be used in the processing of other materials and in the production of nanocomposites for tissue engineering, sensors, water purification and catalysis. In this work, TiO2 nanofibers were synthesized by electrospinning method [1]. To produce the fibers, a precursor solution was made using titanium isopropoxide, glacial acetic acid and an alcoholic solution containing 20% wt/v of polyvinylpyrrolidone (PVP). This solution was then placed in the syringe attached to the electro-spinning system with the needle at 12 cm from the collector and a voltage of 20 kV. To remove the polymeric carrier, solvent residues and promote the formation of titanium oxide, a heat treatment was performed at a temperature of 450 °C for 2 hours. For comparison, the same process was made using TiO₂ nanoparticles instead of Titanium isopropoxide. To characterize the synthesized materials, the techniques of x-ray diffraction (XRD) and scanning electron microscopy (SEM) were used. The photocatalytic activity was measured by the degradation of the methylene blue and rhodamine B in the presence of nanostructured TiO₂ fibers. This process was carried out in a photocatalytic reactor under UV lamps [2]. The photodegradation process of the methylene blue and rhodamine B was only observed in the experiment where TiO₂ nanoparticles replaced the titanium isopropoxide on the nanofiber’s synthesis. It is concluded that nanoparticles of TiO2, better than titanium isopropoxide, give superior photocatalytic activity to TiO₂ nanofibers. [1] - L. G. Soares,et al. 21. CBECIMAT. Cuiabá, Brasil, 2014. [2] BASHA, S.; et. al. Ind. Eng. Chem. Res.2010. (author)