Preparation of Cr-doped TiO2/SiO2 Photocatalysts and their Photocatalytic Properties

Autor:	Hua-Ting Liu, Ru-Fen Chen
Rok vydání:	2011
Předmět:	Anatase Chemistry Nanostructured materials Nanotechnology Cr doped General Chemistry engineering.material Red shift Colloid Nanocrystal Coating Chemical engineering Photocatalysis engineering
Zdroj:	Journal of the Chinese Chemical Society. 58:947-954
ISSN:	0009-4536
DOI:	10.1002/jccs.201190149
Popis:	Cr-doped TiO2/SiO2 nanostructured materials were prepared employing a layer-by-layer assemblym technique. TiO2 colloids were synthesized by a sol-gel method using TiCl4 as a precursor. The experimental results showed that sphere-type TiO2 particles on SiO2 exhibited uniform shape and a narrow size distribution. The amount of Ti (wt %) increased as a function of the number of the coating layers. The coatingv layers was composed of anatase titania nanocrystals at 550 °C. The onset of band-gap transition for Crdoped TiO2/SiO2 showed a red shift compared with that for the undoped TiO2/SiO2. And the photocatalytic activity of Cr-doped TiO2/SiO2 was higher than that of undoped sample.
Databáze:	OpenAIRE
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