Hideo Okuyama, Kazuhiro Honma and Satoru Ohno
National Research Institute for Metals, Tsukuba 300-0047
Ultrafine Particles (UFP) of TiO2 have been synthesized by oxidation of Ti vapor in the tail flame of an argon RF-Plasma, and their activity for photocatalytic hydrogen evolution in aqueous suspensions has been investigated.
Synthesized TiO2 UFP are composed of a mixture of the rutile and anatase phases, and the anatase content in UFP varies from about 35 to 75 mass% depending on the oxygen content and the injection point of a reaction gas. The photocatalytic activity of TiO2 UFP increases drastically with decreasing anatase content, and reaches a maximum at about 40 mass% anatase. The maximum activity is 1000 times larger than that of a commercial anatase UFP.
(Received August 3, 1998; In Final Form October 15, 1998)
radio frequency-plasma, TiO2, ultrafine particle, rutile, anatase, photocatalyst, photocatalytic activity
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