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The effect of preparation method on the photoactivity of crystalline titanium dioxide particles

✍ Scribed by Sarah S Watson; Donia Beydoun; Jason A Scott; Rose Amal

Publisher
Elsevier Science
Year
2003
Tongue
English
Weight
406 KB
Volume
95
Category
Article
ISSN
1385-8947

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✦ Synopsis

The present study shows that acidic conditions during the hydrolysis and condensation of titanium isopropoxide as well as a high water to alkoxide ratio result in crystalline TiO 2 precipitates. Nanosized rutile and anatase particles were prepared at relatively low temperatures (<100 β€’ C) and atmospheric pressure. The crystalline particles exhibited improved photocatalytic activity to particles prepared using the conventional alkoxide method.

Surface cleanliness of the prepared particles was found to be highly influential on the photoactivity of the catalyst. The extent and type of washing was found to affect the surface properties of the particles. X-ray diffractometry, photon correlation spectroscopy (PCS), Brunauer-Emmett-Teller (BET) surface area analysis and transmission electron microscopy (TEM) were used to characterise the powders.

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Thin layers of polycrystailine \(\mathrm{TiO}_{2}\) were deposited on flaky muscovite and phlogopite particles. DeposiIion was performed in a water slurry using aqueous \(\mathrm{TiCl}_{4}\) as the titanium source. The effects of heat treatments on the surface composition of thin \(\mathrm{TiO}_{2}\