Correlation between Some Physical Properties of Titanium Dioxide Particles and Their Photocatalytic Activity for Some Probe Reactions in Aqueous Systems

• DOI: 10.1021/jp0147224
• Publication Date: 2002-10-03T05:01:53Z
• Authors: Hiroshi Kominami; Shin-ya Murakami; Jun-ichi Kato; Yoshiya Kera; Bunsho Ohtani
• Keywords: Titanium Dioxide

Nanocrystalline anatase titanium(IV) oxide (TiO2) particles were synthesized by hydrothermal crystallization in organic media (HyCOM) followed calcination at various temperatures up to 1273 K, and they characterized analysis of surface adsorption the substrates, as well X-ray diffraction (XRD) Brunauer−Emmet−Teller (BET) area measurements. These HyCOM TiO2 samples used for three kinds photocatalytic reactions: mineralization acetic acid (AcOH) aerated aqueous suspensions, dehydrogenation 2-propanol (2-PrOH) situ platinized powders, silver-metal deposition from silver ions (Ag+) deaerated suspensions bare samples. Dependence activities on temperature (Tc) amount adsorbed substrates each reaction correlations with physical properties examined. In case AcOH, activitiy sample was almost proportional surface-adsorbed AcOH dark, uncalcined (as-prepared) showed highest activity, which monotonically reduced Tc, that is, decrease AcOH. On other hand, deposition, activity enhanced higher temperature, despite simultaneous Ag+ dark. Overall, effects several systems strongly suggested depends two significant factors, adsorbability recombination probability, corresponding specific crystallinity, respectively, balance these factors determines Tc dependence.