M. L. Belikov

TiO2- and Nb2O5-based photocatalytic composites

We have studied the influence of Nb content (0.35–60 wt %) and heat treatment on the phase composition, texture, and photocatalytic activity (PCA) of composites based on titanium(IV) and niobium(V) oxides and obtained materials that possess PCA under illumination at λ ≥ 900 nm.

Structure and morphology of iron-modified titania powders

We have studied the phase transitions, particle size, and morphology of titania powders modified with Fe(III) in a wide composition range.

Ferroin adsorption and decomposition on TiO2/Al2O3 photocatalytic nanocomposites

We have studied the phase transitions, texture, adsorptive properties, and photocatalytic activity (PCA) of TiO2-Al2O3 nanocomposites containing 0.5 to 40 wt % Al, prepared through alkaline hydrolysis. The mass of an organic substance adsorbed on the nanocomposites has been shown to correlate with their PCA. Some of the composites exhibit high PCA in the visible spectral region.

Preparation and characterization of mesoporous TiO2-Al2O3 composites

We have established conditions for the synthesis of multiphase nanocomposites in a wide range of TiO2/Al2O3 ratios. The nanocomposites have a thermally stable mesoporous structure and large specific surface area. Some of them exhibit photocatalytic activity at λ ≥ 670 nm.

Ferroin adsorption on TiO2-based photocatalytic materials

We have studied ferroin adsorption on photocatalytically active nanocomposites based on TiO2 doped with Fe3+, Nb5+, or W6+. The results demonstrate that the mass of an adsorbed organic substance correlates with the photocatalytic activity of the photocatalysts. High-temperature heat treatment of the nanocomposites increases manyfold the mass of an organic substance adsorbed from an aqueous solution for unit free surface area of the photocatalyst.

Preparation and properties of photocatalytic composites based on titanium(IV), copper(II), and sodium(I) oxides

We have established conditions for the preparation of multiphase composites based on titanium(IV) and copper(II) oxides in a wide composition range and examined correlations between the phase composition, texture, and preparation conditions of the composites. Some of them have a mesoporous structure, consist of nanoparticles, and exhibit photocatalytic activity under illumination in the visible range.

Synthesis and study of photocatalytic oxide nanocomposites of titanium(IV) and cobalt(II)

The phase formation, texture, and photocatalytic activity of synthesized oxide nanocomposites of titanium(IV) and cobalt(II) have been studied in relation to the cobalt content and temperature of heat treatment. The high photocatalytic activity of optimum compositions has been recorded within the spectral range of visible light with λ ≥ 670 nm.

Synthesis and photocatalytic properties of nanomaterials based on titanium(IV) and zinc(II) oxides

We have synthesized materials based on titanium(IV) and zinc(II) oxides, containing 1 to 60 wt % Zn, at heat-treatment temperatures from 80 to 1150°C, with the formation of multiphase compositions (X-ray amorphous phase, anatase, rutile, ZnTiO3, and/or Zn2TiO4) and studied their phase transitions, morphology, and photocatalytic activity. Increasing the Zn content of the materials is favorable for their spectral sensitization, including the range λ ≥ 670 nm.

Synthesis and physicochemical properties of titanium(IV)- and cobalt(II)-Based photocatalytic oxide composites

We have studied the phase transitions, morphology, and photocatalytic activity of composites based on titanium(IV) and cobalt(II) oxides at Co doping levels from 0.5 to 60 wt % and heat-treatment temperatures from 80 to 1150°C. The highest photocatalytic activity under illumination in the spectral range λ ≥ 670 nm is offered by mesoporous X-ray amorphous and multiphase (X-ray amorphous phase, anatase, rutile, and CoTiO3) nanomaterials containing 5–20 wt % Co, whereas two-phase materials (rutile + CoTiO3) have the lowest photocatalytic activity.

Synthesis and properties of photocatalytic composites based on titanium(IV) and nickel(II) oxides

Composites based on titanium(IV) and nickel(II) oxides have been synthesized and investigated in a wide composition range: 0.5–60 wt % Ni. We have analyzed the effect of synthesis conditions on the phase composition and texture of the composites, some of which contain mesopores, consist of nanoparticles, and offer photocatalytic activity in the visible range.