Photocatalytic activity inhancement of TiO2 nanoparticles with lanthanide ions and sandwich-type polyoxometalates

Photocatalytic Degradation of Methylene Blue under Visible Light Using TiO2 Thin Films Impregnated with Porphyrin and Anderson-Type Polyoxometalates (Cu and Zn)

“…In the spectra of these systems, it is possible to identify the peaks associated with the stretching and angular deformation of the -NH group from the NH4 + counterion, corresponding to the peaks near 1400 and 3000 cm −1 . There is a peak near 1600 cm −1 associated with movements of the -OH group at 3400 and 1600 cm −1 [46]. On the other hand, on both systems, there are two signals near 1630 and 1381 cm −1 associated with the symmetric and antisymmetric vibrational modes of the -CO2 -group.…”

Investigation of Structural, Optical and Photocatalytic Properties of Holmium-Niobium Co-doped TiO2 Nanopowders

“…As the holmium-doped sample showed the best photocatalytic performance (Fig. 5), it was specifically selected as a catalyst for the recycling reusability experiment [55,56]. After each run, the photocatalyst was centrifuged, washed, and dried, and then added to a new MB solution.…”

Application of polyoxometalates in photocatalytic degradation of organic pollutants

“…In 2017, Khoshnavazi successfully loaded a sandwich-type POM K 10 H 2 [(OCe IV ) 3 (PW 9 O 34 ) 2 ]· x H 2 O (PWCe) onto a series of lanthanide-doped TiO 2 (Ln–TiO 2 ; Ln = Pr, Nd, Sm, Eu, Tb) nanoparticles by a simple impregnation method. 75 The introduction of Ln ions has two significant effects: the Ln ions can enhance the electron trapping effect and further delay the electron–hole recombination; they also provide empty f-orbitals for the coordination of organic pollutants and improve the adsorption on TiO 2 surface. Meanwhile, the loaded PWCe can capture the photogenerated electrons and further impede the charge–hole recombination.…”