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Table 2 First order rate constants (k′ × 105, s−1) Cr(VI) to Cr(III) ions photoreduction in the presence of TiO2 and Mn+/TiO2 (M–Co, Ni, Mn, Cu) films with different dopant concentrations

From: Sol-gel Synthesis, Photo- and Electrocatalytic Properties of Mesoporous TiO2 Modified with Transition Metal Ions

Sample Concentration of dopant ions
0% 1% 3% 5% 7%
  First order rate constants (k′ × 105, s−1)
Co/TiO2 3.3 4.4 4.1 4.4 3.8
Ni/TiO2 4.6 4.7 5.2 3.8
Mn/TiO2 4.5 4.2 3.5 3.6
Cu/TiO2 5.8 6.3 6.7 5.8