The Preparation Of Ag/TiO₂ Photocatalyst By The Photo-oxydoreduction Method

The photocatalytic oxidation technology is a new and potential method for the degradation of the organic. One of the importantest focuses was to prepare the high activity photocatalys. The tradtion method for the modification of TiO2 with Ag and other metals was photoreduction, which is only concerned the metal reduction. The process of the Ag/TiO2 photocatalyst preparation in the metal ion-organic compound co-existed system, which is called photo-oxydoreduction method, was studied rarely. Consequently the Ag/TiO2 photocatalyst was prepared by photo-oxydoreduction in Ag+-dye co-excited system in this paper.(1) The optimized reaction conditions of Dye Rhodamine B and 4BS were respectively studied by use of TiO2 micro-particles photocatalyst.(2) The Ag/TiO2 photocatalyst was prepared by the photoreduction and photo-oxyreduction method, respectively.(3) In the study on the Ag/TiO2 photocatalyst prepared in dye-Ag+ co-existed system, the orthogonal design method and uniform design method were applied respectively.(4) The new Ag/TiO2 photocatalyst was prepared with photo-oxydoreduction method, was characterized by XRD, SEM, TEM, XPS, and was used to study photodegradation of methyl orange in a aqueous suspension.The results showed : in the Ag ( I )/dye mixed system, not only the photocatalyst the rate of photocatalytic reaction was increased greatly under the optimal condition, but also the presence of Ag( I) also increased the photoxidation of dye. The experimental result proved the feasibility of the high activity Ag/TiO2 catalyst prepared by photo-oxydoreduction in Ag+-dye co-excited system.