Photocatalytic Properties of Titanium Dioxide Heterostructures with Cyanine Dyes and Polyepoxy Propylcarbazole

We have obtained novel photosensitive materials containing a semiconductor photocatalyst and a dye sensitizer. We have studied the activity of the latter in the reaction of photoreduction of methylene blue, and we consider possible mechanisms for the photocatalytic effect.     

Products of Ag+, Cu+ and Cu2+ Ion Implantation in the Surface of Polycrystalline Cadmium Sulfide as Photocatalysts for the Oxidation–Reduction Reaction of Methylene Blue with Formaldehyde

Semiconductor–semiconductor and molecule (molecular ion)–semiconductor products are formed upon the implantation of Ag⁺, Cu⁺, and Cu²⁺ ions in the CdS surface. Possible mechanisms were examined for their photocatalytic action in the reduction of methylene blue.     

Dark and photochemical reactions between cyanine dye with two conjugated chromophores and titanium dioxide

Heterostructures of TiO₂ with a biscyanine dye were obtained, and their photocatalytic activity in the reduction of methylene blue was investigated. The results from analysis of the spectral parameters showed that the decrease of activity with increase of the dye content results from weakening of its interaction with the semiconductor. __________ Translated from Teoreticheskaya i éksperimental’naya Khimiya, Vol. 44, No. 2, pp. 79–82, March–April, 2008.     

Effect of Transition Element Ions on the Catalytic Activity of Titanium Dioxide during Chemical Deposition of Metallic Copper

We have established the high catalytic activity of TiO₂, modified by Pd²⁺, Cu²⁺, Fe³⁺, and Co²⁺ ions, in reduction of Cu²⁺ ions by formaldehyde in solution. We propose a likely scheme for the electronic processes that occur, including injection of electrons from the reducing agent into the conduction band and formation of metallic nanoparticles on the surface that effectively catalyze deposition of metallic copper.     

Effect of zirconium dioxide and the products from its doping with Al<Superscript>3+</Superscript>, V<Superscript>5+</Superscript>, and W<Superscript>6+</Superscript> ions on the photochemical reduction of methylene blue with formaldehyde

The possibility of photocatalytic reduction of methylene blue by formaldehyde in mixtures with zirconium dioxide and the products from its doping with Al³⁺, V⁵⁺, and W⁶⁺ ions under the influence of light not absorbed by these semiconductors was demonstrated. The way in which the photocatalytic activity is affected by the nature and content of the dopants was established, the energetics of possible electronic processes was examined, and a scheme of transformations was proposed. __________ Translated from Teoreticheskaya i éksperimental’naya Khimiya, Vol. 44, No. 3, pp. 148–152, May–June, 2008.     

Photocatalysis of Reduction of the Dye Methylene Blue by Bi2S3/CdS Nanocomposites

We have determined the optimal conditions for synthesis of Bi₂S₃/CdS nanocomposites and we have determined their photocatalytic activity in the reaction of reduction of methylene blue as a function of composition. We suggest a possible mechanism for the photocatalytic action of the nanocomposites.     

Effect of the composition of titanium-zirconium oxide systems on their photocatalytic activity in the reduction of methylene blue by formaldehyde

Relationships were obtained between the photocatalytic activity (PCA), absorption spectra, electrical conductivity (σ), and catalytic activity (CA) of oxides containing Zr⁴⁺ and Ti⁴⁺ and their quantitative and phase composition. It was found that the PCA and CA depend linearly on σ. The relation between these characteristics and the effectiveness of their action in chemical reactions was studied. __________ Translated from Teoreticheskaya i éksperimental’naya Khimiya, Vol. 42, No. 6, pp. 345–350, November–December, 2006.     

Sensitization of TiO2 by a symmetric anionic polymethine dye with three conjugated chromophores

Research on Chemical Intermediates - Based on the analysis of spectral, electrochemical and energy parameters of the anionic polymethine dye...     

Titanium dioxide sensitization with a biscyanine dye in the photocatalytic reduction of methylene blue

Kinetics and Catalysis - Photosensitive heterostructures containing titanium dioxide and a sensitizer, viz., a cyanine dye with two conjugated chromophores have been obtained. Their absorption...