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Preparation of Cr‐doped TiO 2 /SiO 2 Photocatalysts and their Photocatalytic Properties
Author(s) -
Chen Rufen,
Liu Huating
Publication year - 2011
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.201190149
Subject(s) - photocatalysis , anatase , doping , chemistry , chemical engineering , sol gel , band gap , layer (electronics) , nanocrystal , nanotechnology , nuclear chemistry , mineralogy , inorganic chemistry , materials science , catalysis , optoelectronics , organic chemistry , engineering
Cr‐doped TiO 2 /SiO 2 nanostructured materials were prepared employing a layer‐by‐layer assemblym technique. TiO 2 colloids were synthesized by a sol‐gel method using TiCl 4 as a precursor. The experimental results showed that sphere‐type TiO 2 particles on SiO 2 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 TiO 2 /SiO 2 showed a red shift compared with that for the undoped TiO 2 /SiO 2 . And the photocatalytic activity of Cr‐doped TiO 2 /SiO 2 was higher than that of undoped sample.