Details
| Original language | English |
|---|---|
| Article number | 1022 |
| Pages (from-to) | 1-14 |
| Number of pages | 14 |
| Journal | CATALYSTS |
| Volume | 10 |
| Issue number | 9 |
| Publication status | Published - 4 Sept 2020 |
Abstract
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 TiO 2 /MoO 3, TiO 2 /WO 3, and TiO 2 /V 2 O 5 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 Ti 4+ /Ti 3+ levels and (ii) Mo 5+ 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.
Keywords
- Charge accumulation, Heterostructure photocatalysts, Light-induced photoactivity, Nanomaterials, Oxide semiconductors, Paramagnetic centers
ASJC Scopus subject areas
- Chemical Engineering(all)
- Catalysis
- Chemistry(all)
- Physical and Theoretical Chemistry
Cite this
- Standard
- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
In: CATALYSTS, Vol. 10, No. 9, 1022, 04.09.2020, p. 1-14.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Dynamics of Photogenerated Charge Carriers in TiO2/MoO3, TiO2/WO3 and TiO2/V2O5 Photocatalysts with Mosaic Structure
AU - Kokorin, Alexander I.
AU - Sviridova, Tatyana V.
AU - Konstantinova, Elizaveta A.
AU - Sviridov, Dmitry V.
AU - Bahnemann, Detlef W.
N1 - Funding information: 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.
PY - 2020/9/4
Y1 - 2020/9/4
N2 - 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 TiO 2 /MoO 3, TiO 2 /WO 3, and TiO 2 /V 2 O 5 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 Ti 4+ /Ti 3+ levels and (ii) Mo 5+ 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.
AB - 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 TiO 2 /MoO 3, TiO 2 /WO 3, and TiO 2 /V 2 O 5 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 Ti 4+ /Ti 3+ levels and (ii) Mo 5+ 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.
KW - Charge accumulation
KW - Heterostructure photocatalysts
KW - Light-induced photoactivity
KW - Nanomaterials
KW - Oxide semiconductors
KW - Paramagnetic centers
UR - http://www.scopus.com/inward/record.url?scp=85093888901&partnerID=8YFLogxK
U2 - 10.3390/catal10091022
DO - 10.3390/catal10091022
M3 - Article
VL - 10
SP - 1
EP - 14
JO - CATALYSTS
JF - CATALYSTS
SN - 2073-4344
IS - 9
M1 - 1022
ER -