Abstract
Nano TiO 2 particles coated on fly ash were synthesized by the precipitation dropping method under various hydrolysis conditions in order to develop the low-price photocatalyst. The photocatalytic properties of TiO 2 coated on fly ash have been investigated. About 10 nm anatase TiO 2 particles and homogeneous precipitated layer were produced on the surface of fly ash under the conditions; pH 6 of the solution, 1.0 ml/min of the addition rate of NH 4 HCO 3 and 1000 rpm of the stirring speed. The crystallinity of anatase was increased with raising heating temperature and anatase was changed to rutile by heating at 800°C. The photocatalytic decomposition of acetic acid was affected by both the morphology and the crystallinity of precipitated TiO 2 particles.
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