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Заглавие документа: | Dynamics of photogenerated charge carriers in tio2 /moo3, tio2 /wo3 and tio2 /v2 o5 photocatalysts with mosaic structure |
Авторы: | Kokorin, A.I. Sviridova, T.V. Konstantionova, E.A. Sviridov, D.V. Bahnemann, D.W. |
Тема: | ЭБ БГУ::ЕСТЕСТВЕННЫЕ И ТОЧНЫЕ НАУКИ::Химия |
Дата публикации: | 2020 |
Издатель: | MDPI |
Библиографическое описание источника: | Catalysts, 10(9), 1-14. |
Аннотация: | Titania is a widely used photocatalytic material possessing such advantages as low cost and high reactivity under the ultraviolet light illumination. However, the fast recombination of photoexcited charge carriers limits its application. Herein, we have synthesized original nanomaterials with mosaic structures that exhibited well-defined heterojunctions and new properties. Using SEM, XRD, EPR spectroscopy, photocatalytic measurements, and photoinduced pathphysiological activity of these photocatalysts, we studied the processes of charge carrier accumulation in TiO2 /MoO3, TiO2 /WO3, and TiO2 /V2 O5 under in situ UV illumination with emphasis on the charge exchange between energy levels of these nanosized semiconductors. It is shown that the accumulation of photoinduced charges occurs in two forms (i) filled electron traps corresponding to Ti4+ /Ti3+ levels and (ii) Mo5+ centers, both forms contributing to the photoinduced biocide activity of the samples. This work demonstrates that light exposure of heterostructure photocatalysts with mosaic surfaces produces different types of charge-trapping centers capable of interacting with molecular oxygen yielding peroxo species, which provide long-life light-induced ”self-cleaning” behavior. Such photoaccumulating materials open new opportunities in developing light-driven self-sterilization structures exhibiting a prolonged bactericidal effect up to 10 h after stopping light exposure. |
URI документа: | https://elib.bsu.by/handle/123456789/287970 |
DOI документа: | 10.3390/catal10091022 |
Scopus идентификатор документа: | 85091470163 |
Финансовая поддержка: | Funding: A.I.K. and E.A.K. are thankful to the Russian Foundation of Basic Research for financial support (Grant No. 18-53-00020-Bel-a). T.V.S and D.V.S. acknowledge the support from the Belarusian Republican Foundation for Fundamental Research (Grant Kh19MS-017). A.I.K. and E.A.K. are thankful to the Russian Foundation of Basic Research for financial support (Grant No. 18-53-00020-Bel-a). T.V.S and D.V.S. acknowledge the support from the Belarusian Republican Foundation for Fundamental Research (Grant Kh19MS-017). The EPR measurements were performed using the facilities of the Collective Use Center at the Moscow State University. |
Лицензия: | info:eu-repo/semantics/openAccess |
Располагается в коллекциях: | Статьи химического факультета |
Полный текст документа:
Файл | Описание | Размер | Формат | |
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catalysts-10-01022-v2.pdf | 4,54 MB | Adobe PDF | Открыть |
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