A comparative study of optical absorption and photocatalytic properties of nanocrystalline single-phase anatase and rutile TiO2 doped with transition metal cations

作者：Kernazhitsky L^*; Shymanovska V; Gavrilko T; Naumov V; Kshnyakin V; Khalyavka T

来源：Journal of Solid State Chemistry, 2013, 198: 511-519.

DOI：10.1016/j.jssc.2012.11.015

• Titanium dioxide
• Transition metal impurities
• Band gap
• Optical absorption
• Photocatalytic activity

The effect of nanocrystalline TiO2 doping with transition metal cations (Cu2+, Fe3+, Co2+, Cr3+) on their optical absorption and photocatalytic properties was investigated. The obtained metal-doped TiO2 samples were characterized by X-ray diffraction, scanning electron microscopy, and UV-vis absorption spectroscopy. It is shown that doping effect on anatase (A) and rutile (R) properties is quite different, being much stronger and complicated on A than on R. Contrary to doped R, doped A revealed a significant red shift of the absorption edge along with the band gap narrowing. Photocatalytic activity of anatase increases upon doping in the order: A < A/Co < A/Cu < A/Fe. On the contrary, photocatalytic activity of rutile samples decreases upon doping in the series R > R/Co > R/Cu > R/Fe > R/Cr, indicating the inhibitory effect of impurity cations. This fact correlates with the decrease in the UV absorption of the doped rutile in the region of the Hg-lamp irradiation at 4.88 eV.

• 出版日期2013-2