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1.
A. E. Raevskaya A. L. Stroyuk S. Ya. Kuchmii Yu. M. Azhnyuk V. M. Dzhagan M. Ya. Valakh 《Theoretical and Experimental Chemistry》2006,42(3):162-168
The optical characteristics of CdSe nanoparticles, produced in aqueous solutions and polymer films in the reaction of cadmium
chloride and sodium selenosulfate, were studied. The main parameters that make it possible to vary the forbidden band width
were identified. The absorption, photoluminescence, Raman, and nonstationary decolorization spectra of CdSe nanoparticles
of various sizes were analyzed. It was demonstrated that under the conditions of pulsed irradiation the CdSe nanoparticles
are capable of accumulating excess electrons and inducing redox transformations in components of the solution (oxygen, methylviologen,
and sulfite ions).
__________
Translated from Teoreticheskaya i éksperimental’naya Khimiya, Vol. 42, No. 3, pp. 150–155, May–June, 2006. 相似文献
2.
Irradiation of suspensions of CdS in water-ethanol mixtures containing nibrobenzene with light at > 320 run does not in practical terms lead to the reduction of the nitrobenzene to aniline. It has been shown that the formation of aniline occurs when solvato complexes of vanadium(III) (PhNH2=18.1·10–3) and vanadium(IV) (PhNH2= 2.84·10–3) are added to the system. The photocatalytic reduction of nitrobenzene is accompanied by oxidation of the alcohol to acetaldehyde and acetal. The proposed process mechanism includes stages and acceptance of an electron photogenerated in the semiconductor by vanadium compounds and of a hole by molecules of the alcohol and subsequent stages of reaction of the reduced forms of vanadium, and also of the ethoxy radicals with nitrobenzene, which leads to its reduction.Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 25, No. 5, pp. 550–557, September–October, 1989. 相似文献
3.
A. I. Kryukov S. Ya. Kuchmii A. V. Korzhak N. F. Guba S. V. Kulik 《Theoretical and Experimental Chemistry》1994,29(3):182-184
We have obtained new semiconductor materials with microheterojunctions by substitution of surface cadmium ions in CdS by Cu(I), Cu(II), and Bi(III) ions. We have shown that the photocatalytic activity of their dispersions in the reaction of evolution of H2 from alcohol-water mixtures is considerably higher than in the original cadmium sulfide.Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 29, No. 3, pp. 270–274, May–June, 1993.We would like to acknowledge Academician V. D. Pokhodenko of the Academy of Sciences of Ukraine for drawing our attention to the prospects for investigation of complex photocatalytic systems based on semiconductors with different types of conductivity. 相似文献
4.
Shvalagin V. V. Stroyuk A. L. Kuchmii S. Ya. 《Theoretical and Experimental Chemistry》2004,40(3):149-153
The photoreduction of Cu2+ at the surface of ZnO nanoparticles and ZnO/Ag nanostructures was investigated. The spectral characteristics of the obtained ZnO/Cu and ZnO/Ag/Cu composites were studied in relation to the reaction conditions. It was shown that the ZnO/Ag nanoparticles have higher photocatalytic activity in the reduction of Cu2+ ions than the individual ZnO particles. 相似文献
5.
A. I. Kryukov A. V. Korzhak G. M. Tel’biz V. G. Il’in S. Ya. Kuchmii 《Theoretical and Experimental Chemistry》1998,34(2):93-98
An attempt has been made to create organized, highly efficient photocatalytic systems in the example of composite materials
consisting of blocks of a metallocomplex photocatalyst and a dark-stage catalyst, assembled on a zeolite matrix. The spectral
and photochemical properties of these systems have been investigated, and also their use in catalysis of hydrogen evolution
from alcohol-water media.
L. V. Pisarzhevskii Institute of Physical Chemistry, National Academy of Sciences of the Ukraine, 31 Nauka Prospect, Kiev
252039, Ukraine. Translated from Teoreticheskaya i éksperimental’naya Khimiya, Vol. 34, No. 2, pp. 103–108, March–April, 1998. 相似文献
6.
A. I. Kryukov S. Ya. Kuchmii A. V. Korzhak 《Theoretical and Experimental Chemistry》1988,24(6):649-655
Conditions were found under which radical pairs become stabilized during the photolysis of peroxy complexes of titanium(IV) in alcoholic solutions. It was shown that precursors are dimeric complexes of titanium(IV) comprising peripheral peroxy ligands as well as a peroxy bridge. Irradiation by light corresponding to the peroxy ligand — the central ion charge transfer bands, leads to the initiation of an intraspheric reaction, as a result of which two peripheral peroxy ligands undergo a one-electron oxidation, while the bridge undergoes a two-electron reduction. The radical particles (HO2
. and O2
) formed from the peripheral peroxy ligands become stabilized at strictly delineated distances relative to one another, which are determined by the structure of the initial dimeric peroxy complex of titanium(IV).Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 24, No. 6, pp. 678–685, November–December, 1988. 相似文献
7.
S. V. Kulik A. V. Korzhak S. Ya. Kuchmii A. I. Kryukov 《Theoretical and Experimental Chemistry》1995,30(4):171-175
Cadmium sulfide and heteropolytungstate were found to form an organized photocatalytic system providing separation of photogenerated charges. Reduction of nitrobenzene, nitrosobenzene, and phenylhydroxylamine to aniline has been investigated in this system; kinetic patterns have been established and quantum yields of the reactions have been determined.Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 30, No. 4, pp. 206–210, July–August, 1994.The authors are grateful to the Fund for Fundamental Research of the Ukrainian State Committee on Science and Technology for supporting this work. 相似文献
8.
S. Ya. Kuchmii A. V. Korzhak N. F. Guba S. V. Kulik A. I. Kryukov 《Theoretical and Experimental Chemistry》1996,31(6):309-313
The possibility of photocatalysis of hydrogen production from aqueous alcohol mixtures by heterostructures of cadmium sulfide with dyes under the action of light with >600 nm was shown. A probable mechanism of the sensitization is proposed on the basis of an examination of the spectral, photochemical, and electrochemical data obtained.Translated from Teoreticheskaya i Éksperimental'naya Khimiya, Vol. 31, No. 6, pp. 370–374, November–December, 1995.The authors are grateful to S. V. Shinkorenko for providing the dyes that they synthesized for the first time. 相似文献
9.
A. E. Raevskaya A. L. Stroyuk S. Ya. Kuchmii 《Theoretical and Experimental Chemistry》2005,41(3):181-186
We have shown that CdSe/CdS nanocomposites can be obtained in a photocatalytic reaction with participation of CdS nanoparticles from sodium selenosulfate. We have studied the kinetic characteristics of this process in detail and have shown that its most likely mechanism includes a step involving reaction between SeSO3/2− anions and electrons generated in the conduction band of the CdS nanoparticles during irradiation and stabilized in traps on the semiconductor surface.__________Translated from Teoreticheskaya i Eksperimental’naya Khimiya, Vol. 41, No. 3, pp. 171–175, May–June, 2005. 相似文献
10.
A. I. Kryukov S. Ya. Kuchmii V. D. Pokhodenko 《Theoretical and Experimental Chemistry》1997,33(5):272-287
The results of studies of new photocatalysts—composites of cadmium sulfide with nanoparticles or thin layers of copper(I),
silver(I), mercury(I), copper(II), bismuth(III), antimony(III) and iron(III) sulfides—are reviewed. The optical and electrophysical
characteristics, the ranges of photosensitivity, the nature of the increased activity and the peculiarities of the photocatalytic
effects are discussed.
L. V. Pisarzhevskii Institute of Physical Chemistry, National Academy of Sciences of Ukraine, 22039 Kiev, Science Prosp.,
31. Translated from Teoreticheskiya i éksperimental'naya Khimiya, Vol. 33, No. 5, pp. 306–321, September–October, 1997. 相似文献