Porous TiO 2-anatase films were prepared by sol-gel route showing higher photocatalytic activity in degradation of trichloroethylene (TCE) in air compared to dense titania films. Thus, titania sols were synthesized with and without a pore generating agent, polyethylene glicol (PEG), to evaluate the effect of porosity in the photocatalytic activity of the coatings. The films were deposited by dipping and sintered at different temperature and time. The characterisation was performed by profilometry, Fourier Transform Infrared Spectroscopy (FTIR), Grazing X-ray Difraction (GXRD) and Field Emision Scan Electron Microscopy (FE-SEM), observing that anatase phase is obtained at temperatures as low as 350 ºC. The maximum specific surface area (S s = 43 m 2 /gr) was obtained for coatings prepared from TiO 2 sol with PEG and sintered at 400 ºC. Porous TiO 2-anatase films present trichloroethylene (TCE) conversion around twenty percent higher than that of dense films. Porous volume, surface area and thickness of the coating play a key role in the photocatalytic activity. On the other side, variation in particle size seems not to be a critical parameter in the studied range.

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