The dissertation is devoted to the research of the influence of the ratio (X) of the concentrations of precursors of non-metallic dopants (C, N, F, S) and titanium (Ti (BuO)4) in the sol-gel reaction mixture containing acetic acid, and from which first obtained ash nanostructures NM-TiO2, which were subjected to hydrothermal treatment, and calcination temperature on the physicochemical properties of the obtained (X) NM-TiO2 nanostructures, in particular, phase and chemical composition, morphology, adsorption properties, as well as the study of the influence of X and TC on the photocatalytic activity of these nanostructures under ultraviolet (PCAUV) and visible (PCAVIS) light irradiation, as well as sunlight, in the photodegradation processes of doxycycline (DC), tetracycline (TC), ceftazidime (CFT), methylene blue (MB), methyl orange (MO) and gas-phase processes of CO photooxidation, CO2 photoreduction. In this work C-doped and codoped (C, F; C, N, F; C, S) with nonmetals (X) NM-TiO2 (TНТТ/TC) nanostructures nanosheets, nanospheres consisting of nanolines or spherical nanocrystals with different packing densities, or close to spherical particles of different chemical composition depending on the nature of the precursor NM, X, TC were obtained. Using a set of independent physicochemical methods, the structure, phase and chemical composition were studied, the features of the structure, which undergo significant changes depending on the nature of the precursor NM, X, TC. The presence of interstitial dopants (C or / and S and/or N) in (X) NM-TiO2 (THTT/TC) is shown, which provide their ability to absorb light in the visible range and high FCAVIS. Exponential dependences of changes in the content of anatase (A, %), SBET and PCAUV/VIS from both X and TC, extreme dependences of changes in A, %, SBET, total adsorption volume, unit cell volume, PCAUV/VIS from TC and changes of PCAUV/VIS from X. It is shown that in some cases PCAUV/VIS will change sympathetically with changes of A, %, SBET. The optimal conditions for obtaining nanostructures with the optimal balance of their physico-chemical characteristics, which provide their high PСAUV/VIS, are determined. New methods of controlled hydrothermal sol-gel synthesis of doped nanostructures with high PСAUV/VIS, which are protected by patents of Ukraine, are proposed. It was found that PСAUV/VIS of the obtained nanostructures in the studied processes of photodegradation of antibiotics and dyes is many times higher than the standard photocatalyst TiO2 Evonik P-25, and PCAUV in the processes of photooxidation of CO and photoreduction of CO2 is higher than for many known photocatalysts. The most active among the studied samples were tested in the process of DC photodegradation under sunlight irradiation and it was shown that for some of them the conversion in 30 minutes reaches 85%.
