The structural and photoluminescence studies related to the surface of the TiO2 sol prepared by wet chemical method

Synthesis, characterization and photocatalytic activity of neodymium, nitrogen and neodymium–nitrogen doped TiO2

“…The recommended content of Nd as dopant varies: 0.5 mol% (anatase doping) [13,16], 3% Nd 2 O 3 [23]. A significant enhancement in photoactivity was obtained at 0.5-1 wt.% rare earth ion doping but TiO 2 doped with 10 wt.% Nd 3+ shows the highest activity among all rare earth doped samples investigated in [14] (rate constants k = 0.0272 min À1 for UV and 0.0143 min À1 for visible light, Orange II as a model pollutant).…”

“…Thus, the separation of electronhole pairs is accompanied with the enhance of hydroxyl radicals formation, which are one of the main oxidation agents in the photocatalytic process [12]. According to [13], doping of TiO 2 with Nd 3+ reduces the band-gap energy because of formation of defect energy levels induced by the 4f-atomic orbitals of Nd 3+ . The role of the higher adsorption and 4f electron transitions of rare earth ions is pointed out in [14].…”

Improvement of TiO2 photocatalytic properties under visible light by WO3/TiO2 and MoO3/TiO2 composites

“…The predominant peak at 530.4 eV is assigned to the crystal lattice oxygen (Ti-O and W-O), while the peak located at 531.2 eV represents the oxygen in hydroxyl groups, respectively [38]. As for the XPS spectra of 2 wt% MoO 3 /TiO 2 composite in PL spectrum is a powerful tool to analyze information such as surface oxygen vacancies and defects, as well as the efficiency of charge carriers trapping, immigration and transfer, and to understand the fate of electrons-hole pairs in semiconductor [40,41]. Fig.…”

A kinetic model for evaluating the dependence of the quantum yield of nano-TiO2 based photocatalysis on light intensity, grain size, carrier lifetime, and minority carrier diffusion coefficient: Indirect interfacial charge transfer

“…For a nanosystem, the bulk recombination is always neglected to simplify the problem. However, according to a previous PL spectroscopy investigation, it was found that, even for a grain size as small as 10 nm, the bulk recombination cannot be ignored, so the bulk recombination was taken into account in the current study [15]. Furthermore, we established an efficient method to numerically deal with the mathematical-physical model of heterogeneous photocatalysis, which can be easily applied to more complicated cases.…”