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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.115  No.1348 (December) (2007)  >  pp.821-825

Journal of the Ceramic Society of Japan
<<Previous article Vol.115  No.1348 (December) (2007)   pp.821 - 825 Next article>>

Photocatalytic Activities of Rutile and Anatase Nanoparticles Selectively Prepared from an Aqueous Solution

Munehiro SAKANOUE1), Yasuhiro KINOSHITA1), Yuichi OTSUKA1) and Hiroaki IMAI1)
1) Department of Applied Chemistry, Faculty of Science and Technology, Keio University

  Nanoscale particles of rutile- and anatase-type titanium dioxides were selectively grown in acidic solutions of titanyl sulfate. The variation of photocatalytic activity as a function of UV light intensity was investigated using rutile and anatase powders having almost the same size (20-30 nm) and shape for a clear comparison of the performance depending on the crystal structure. Whereas the performance of anatase evaluated with the decomposition of methylene blue and the reduction of Cr(VI) under UV light was proportional to the square root of the UV light intensity, rutile showed a saturation of the activity in the high-intensity region regardless of the light sources and photochemical reactions. The saturating tendency of rutile weakened with an electron-withdrawing reaction or a decrease in the grain size. Then, the performance of rutile could be superior to that of anatase under illumination at a low-light-intensity. The difference in the photocatalytic performance between rutile and anatase is tentatively ascribed to a high recombination rate of generated electrons and holes associated with a low mobility of carriers in rutile.

TiO2, Photocatalysis, Titania, Polymorph, Nanoparticle, Optical property

Received: August 30, 2007
Accepted: September 20, 2007 , Published online: December 01, 2007
Copyright (c) 2007 The Ceramic Society of Japan



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