The Effect of Chromium on the Optical Properties and Photoactivity of Nano-Particulate Rutile

Abstract:

Chromium doped rutile TiO₂ was synthesized by either co-precipitation or impregnation (surface-doping) and characterized by XRD and reflectance spectroscopy. Chromium addition did not change the TiO₂ structure nor did the structure of the co-precipitated products differ from that of the impregnated samples. However, chromium doping moved the absorption of both sets of products into the visible and significantly affected the TiO₂ photocatalytic activity for isopropanol (IPA) oxidation. At high chromium concentrations the photoactivity of the co-precipitated samples was reduced by a larger amount than that of the impregnated samples; this was attributed to a higher concentration of Cr³⁺ ions in the rutile lattice. Unexpectedly, increased photoactivity was measured for low Cr levels of surface-doped rutile. This may be caused by increased electron-trapping, at surface Cr⁶⁺ ions, and correspondingly reduced, electron-hole recombination.

• Periodical: Advanced Materials Research (Volumes 554-556)
• Pages: 502-506
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.554-556.502
• Online since: July 2012
• Authors: Li Wei Wang, Terry A. Egerton
• Keywords: Chromium Doping, Photoactivity, Rutile, Titanium Dioxide (TiO₂), Transition Metal

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