超臨界水熱合成法による光触媒酸化チタンナノ微粒子の製造

概要

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Hydrothermal synthesis of TiO_2 nanoparticles from Titanium Tetraisopropoxide (TTIP) -isopropyl alcohol (IPA) solution were carried out with a flow-through apparatus for continuous production and rapid heating of starting solution to supercritical states. The lack of metal oxide solubility induced by low ionic product and dielectric constant achieved fine TiO_2 nanoparticle synthesis by means of nucleus generation at oversaturated condition. Reaction effluent obtained present study at temperatures from 25℃ to 400℃ was dried or filtrated to collect TiO_2 powder. The obtained TiO_2 nanoparticles were characterized as anatase phase by means of X-ray powder diffraction (XRD). Acetaldehyde decomposition profiles of the TiO_2 particles estimated this study showed higher photocatalyst activity than that of the commercial P25 TiO_2 photocatalyst. The transmission electron microscopy (TEM) observation for TiO_2 particles revealed that the particle size were about 15nm, indicating that two-step particle formation at the present equipment for the particle production at supercritical condition.