Nanocrystalline Brookite-Type Titanium(IV) Oxide Photocatalysts Prepared by a Solvothermal Method: Correlation Between Their Physical Properties and Photocatalytic Activities

摘要: Nanocrystalline brookite-type titanium(IV) oxide TiO2 powder was synthesized by solvothermal treatment of oxobis(2,4-pentanedionato-O,O′)titanium in a 1,2-ethanediol-water system the presence sodium acetate followed hydrothermal at 373 K order to remove organic moieties contaminating powder. The calcined various temperatures change its physical properties and then used for three types photocatalytic reaction: mineralization acetic acid (AcOH) an aerated aqueous suspension bare powder, evolution molecular hydrogen from 2-propanol situ platinized formation oxygen (O2) silver sulfate deaerated Dependence activities on calcination temperature (Tc) correlations with samples were examined. In case AcOH, uncalcined brookite sample having largest surface area showed highest rate carbon dioxide (RCO2), which equal that representative commercial (Degussa P-25), RCO2 decreased monotonously Tc, i.e., decrease area. On other hand, O2 formation, activity enhanced higher temperature, despite simultaneous Overall, effects reaction systems strongly suggested depends two significant factors, adsorbability recombination probability, corresponding specific crystallinity, respectively, balance these factors determines Tc dependence.