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This work is devoted to the study of phase transition processes in nanostructured ceramics of the Y 2 O 3 /TiO 2 -Y 2 TiO 5 type doped with carbon nanotubes as a result of thermal annealing, as well as to the assessment of the prospects of the effect of phase composition on photocatalytic activity. By the method of X-ray phase analysis, it was found that an increase in the annealing temperature leads to the formation of the orthorhombic phase Y 2 TiO 5 , as well as structural ordering. Based on the obtained UV spectra, the band gap was calculated, which varies from 2.9 eV (initial sample) to 2.1 eV (annealed at a temperature of 1000 °C). During photocatalytic tests, it was established that the synthesized nanostructured ceramics Y 2 O 3 /TiO 2 -Y 2 TiO 5 doped CNTs show a fairly good photocatalytic activity in the range of 60-90% decomposition of methyl orange.

Phase Transformations and Photocatalytic Activity of Nanostructured Y2O3/TiO2-Y2TiO5 Ceramic Such as Doped with Carbon Nanotubes