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The effect of particle size and active surfaces on photoreactivity of TiO 2 crystals is investigated in this report. The clarification of highly active surfaces is the key to understanding the photoreactivity of anatase TiO 2 crystal and also to morphological control of photocatalysts with well-defined crystal facets. The anatase TiO 2 single crystals with different percentage of {001} facets in uniform size, as well as anatase TiO 2 single crystals with different particles size in same percentage of {001} facets, are synthesized by carefully controlling the synthesis parameters. Their photooxiation reactivity results indicate that the underlying dominant factor for photooxidation activity of anatase TiO 2 crystals is particle size. The photooxidation activity of {001} facets is greater than that of {101} facets when the crystals size of anatase TiO 2 is identical. This work would be beneficial for better understanding the different photocatalytic performance of different facets of metal oxide crystals in photoreactivity processes.
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Wu et al. (2012) studied this question.
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