/ D. S. Shtarev [et al.]> // Catal. Today. - 2020. -
Vol. 340. - P. 70-85,
DOI 10.1016/j.cattod.2018.09.035. - Cited References: 52. - The research was kindly funded by a grant from the Russian Science Foundation (project No. 17-73-00007). P.D. Murzin, A.V. Rudakova and V.K. Ryabchuk are grateful for financial support by the Mega-grant (No. 14.Z50.31.0016 ) from the Government of the Russian Federation within the Project “Establishment of the Laboratory of Photoactive Nanocomposite Materials” . The authors are very grateful to the staff of the Khabarovsk Innovation and Analytical Center of the Yu. A. Kosygin Institute of Tectonics and Geophysics FEB RAS, and the Resource Centers of the Research Park at the Saint-Petersburg State University: (i) Center for Diagnostics of Functional Materials for Medicine, Pharmacology and Nanoelectronics, (ii) Center for Physical Methods of Surface Investigation, (iii) Center for Optical and Laser Materials Research, and (iv) the Nanophotonics Center for their valuable assistance in carrying out the research and in providing the needed equipment. One of us (NS) is grateful to Prof. Angelo Albini for his continued hospitality in the PhotoGreen Laboratory at the University of Pavia, Italy.
. - ISSN 0920-5861
Перевод заглавия: Твердотельный синтез, характеризация, УФ-окрашивание и фотокаталитическая активность висмутатов Sr6Bi2O11, Sr3Bi2O6 и Sr2Bi2O5
Аннотация: This article reports on two novel strontium bismuthate photocatalysts (Sr6Bi2O11 and Sr3Bi2O6) prepared by a solid-state synthesis for which the number of strontium atoms exceeds the number of bismuth atoms in the cation sublattice; for comparison, the bismuthate Sr2Bi2O5 was also re-examined. All three bismuthates were characterized by a variety of spectroscopic techniques (XRD, XPS, EDX, DR, Raman, SEM, and EIS). Direct bandgap energies for the three bismuthates were assessed from diffuse reflectance spectra: 2.61 eV for Sr6Bi2O11; 3.40 eV for Sr3Bi2O6; 3.17 eV for Sr2Bi2O5, while the flatband potentials (versus NHE) of the corresponding valence bands were estimated from XPS spectra: +2.22 eV for Sr6Bi2O11; +1.71 eV for Sr3Bi2O6; +1.61 eV for Sr2Bi2O5. The two novel bismuthates displayed photocatalytic activity toward the photodegradation of acetaldehyde in the gas phase and phenol in aqueous media, with the Sr6Bi2O11 system exhibiting significantly greater photoactivity vis-à-vis the Sr3Bi2O6 bismuthate; by comparison, Sr2Bi2O5 was photocatalytically inactive in this case; their photoactivity was also assessed from the photodegradation of phenol in aqueous media (in all cases using UV-Vis irradiation from a Xe light source). Detailed photocatalytic mechanisms are proposed based on UV-induced coloration studies (carried out using a high-pressure Hg lamp; 365 nm) and on the photodegradation in the presence of radical scavengers to explain how composition and structure of the three bismuthates affect their photocatalytic activity. The role of point defects (oxygen vacancies) in their crystal lattice is described as they affect photocatalytic activity by acting as electron traps and potentially as electron/hole recombination centers.
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Держатели документа: Yu. A. Kosygin Institute of Tectonics and Geophysics, Far Eastern branch of the Russian Academy of Sciences, 65 Kim Yu Chen Street, Khabarovsk, 680063, Russian Federation
Far Eastern State Transport University, 47 Seryshev Street, Khabarovsk, 680021, Russian Federation
St. Petersburg State University, Ulianovskaya 2, Petergof, Saint-Petersburg, 198904, Russian Federation
Kirensky Institute of Physics, Akademgorodok 50, bld. 38, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, 79 Svobodny pr., Krasnoyarsk, 660041, Russian Federation
PhotoGreen Laboratory, Dipartimento di Chimica, Universita di Pavia, via Taramelli 12, Pavia, 27100, Italy
Доп.точки доступа: Shtarev, D. S.; Shtareva, A. V.; Ryabchuk, V. K.; Rudakova, A. V.; Murzin, P. D.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Koroleva, A. V.; Blokh, A. I.; Serpone, N.