NANOSYSTEMS: PHYSICS, CHEMISTRY, MATHEMATICS, 2018, 9 (3), P. 401–409
Optical properties and photocatalytic activity of nanocrystalline TiO2 doped by 3d-metal ions
I.V. Kolesnik – Lomonosov Moscow State University, Leninskie Hills, 1, Moscow, 119992; Institute of General and Inorganic Chemistry, Leninsky avenue, 31, Moscow, 119991, Russia; email@example.com
V. A. Lebedev – Lomonosov Moscow State University, Leninskie Hills, 1, Moscow, 119992, Russia; firstname.lastname@example.org
A.V. Garshev – Lomonosov Moscow State University, Leninskie Hills, 1, Moscow, 119992; Institute of Metallurgy, Leninsky avenue, 49, Moscow, 119334, Russia; email@example.com
The influence of impurities on optical and photocatalytic properties was studied in a series of nanocrystalline TiO2 with similar coherent scattering region sizes, phase compositions, surface areas and lattice parameters doped by Fe, Cr, Mn and V ions. Doping leads to an increase of absorption in the visible part of the spectrum due to the formation of additional levels in the band gap. In the case of Fe and Cr ions, d-d transitions are observed, whereas in the case of Mn and V ions, an additional band is associated with the transition from impurity level to Ec. The presence of impurities effectively suppresses photocatalytic activity in the methyl orange decoloration reaction.
Keywords: titanium oxide, nanocrystalline, doped TiO2, photocatalysis, band gap, Urbach tail, impurity levels.
PACS 61.46.+w, 61.46.w, 71.55.I, 78.20.e, 78.40.Fy, 81.05.t, 81.07.Bc, 82.50.Hp