Publication Cover
High Pressure Research
An International Journal
Volume 20, 2001 - Issue 1-6
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Original Articles

Hydrothermal crystallisation of anatase and characterisation of photocatalytic properties

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Pages 79-85 | Received 10 Jan 2000, Accepted 25 Feb 2000, Published online: 19 Aug 2006
 

Abstract

Hydrothermal processing has been used to prepare anatase powders from amorphous titania, for use as photocatalysts. There is a change in crystallisation mechanism from solid state to dissolution/precipitation at around 250°C, which has been shown to result in the removal of the brookite secondary product which normally occurs at lower temperatures. The use of a slightly basic solution has also been shown to eliminate brookite production. Photocatalysis experiments have shown that the hydrothermally produced powders have a high activity when compared to the commercial powder Degussa P25. The presence of the brookite phase in some samples reduces the activity.

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