Cu-doped TiO2 systems with improved photocatalytic activity 提高光催化活性的铜掺杂二氧化钛系统.pdfVIP

Applied Catalysis B: Environmental 67 (2006) 41–51 /locate/apcatb Cu-doped TiO2 systems with improved photocatalytic activity ´ * ´ G. Colon , M. Maicu, M.C. Hidalgo, J.A. Navıo Instituto de Ciencia de Materiales de Sevilla, Centro Mixto Universidad de Sevilla-CSIC, Americo Vespucio s/n, Sevilla 41092, Spain Received 1 February 2006; received in revised form 14 March 2006; accepted 24 March 2006 Available online 19 May 2006 Abstract Photocatalytic oxidation of phenol was performed over copper doped TiO2 prepared by a sol–gel method. Different preparation methods were followed and a comparison with undoped system was also made. Wide structural and surface characterization of catalysts was carried out in order to establish a correlation between the effect of sulphuric and nitric acids present in the initial solution and the Cu–TiO2 photocatalytic properties. The presence of sulphuric acid clearly stabilizes Cu–TiO2 and TiO2 structure and surface against sintering, maintaining anatase phase and relatively high surface area values with respect non sulphated Cu–TiO or TiO . Best photocatalytic behaviour is found for sulphated TiO , as 2 2 2 previously reported. In addition, incorporation of copper ions into the structure seems to enhance the photoactivity of the system for acidified systems, being the s