METHOD FOR OBTAINING PHOTOCATALYTIC TITANIUM DIOXIDE OF ANATASE AND BROOKITE MODIFICATION ON THE SURFACE OF A CERAMIC PRODUCT OF RUTILE OBTAINED BY OXIDATIVE DESIGN Russian patent published in 2019 - IPC B01J21/06 C01G23/53 B82B3/00 B82Y40/00 

FIELD: water and air purification technology.

SUBSTANCE: invention can be used in obtaining photocatalysts of various forms based on titanium dioxide for photocatalytic purification of water and air from organic compounds. Method of obtaining photocatalytic titanium dioxide TiO₂ is based on the surface modification of the rutile phase, obtained by the method of oxidative design. In the course of two consecutive hydrothermal syntheses, the upper layer of compact rutile ceramics was converted into needle-like crystals of sodium titanate phase by hydrothermal treatment in a strongly alkaline medium (15 M NaOH) at 200 °C for 48 h, with the subsequent transition of the protonated form of sodium titanate into nanotubes of the anatase and brookite phase by hydrothermal treatment in a weakly acidic medium (0.05 M HNO₃) at 120 °C for 48 h. By the BET method, it was established that the specific surface area of anatase and brookite nanostructures grown on the surface of rutile ceramics was S_s=50 m²/g, which is much more than the specific surface of the original rutile ceramics (1–3 m²/g). Photocatalytic phases of anatase and brookite, built up on the surface of rutile ceramics, have significant photocatalytic activity in the photocatalytic decomposition of ozone, which characterizes such ceramic products as a promising material for photocatalytic applications.

EFFECT: method is proposed for obtaining photocatalytic titanium dioxide of anatase and brookite modification on the surface of a rutile ceramic product obtained by oxidative design.

1 cl, 9 dwg, 1 ex