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Visible-light-responsive surface-modified TiO2 powder with 4-chlorophenol: A combined experimental and DFT study

Authorized Users Only
2019
Authors
Barbierikova, Zuzana
Dvoranova, Dana
Brezova, Vlasta
Džunuzović, Enis S.
Sredojević, Dušan
Lazić, Vesna M.
Nedeljković, Jovan
Article (Published version)
,
© 2019 Elsevier B.V.
Metadata
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Abstract
The visible-light-responsive inorganic-organic hybrid was prepared by surface modification of commercial TiO2 powder (Degussa P25) with 4-chlorophenol (4-CP). The optical absorption of the hybrid material is red-shifted compared to unmodified TiO2 powder due to the surface charge transfer complex (CTC) formation. The experimental results are supported by the density functional theory (DFT) calculations of the corresponding model cluster. The calculated electronic excitation spectrum is in agreement with the measured reflection spectrum of surface-modified TiO2 powder with 4-CP. The paramagnetic species, generated in the unmodified and surface-modified TiO2 powders upon excitation with ultraviolet and visible light, were identified using low-temperature electron paramagnetic resonance (EPR) spectroscopy. The formation of trapped electrons (Ti(III) centers) and the persistent oxygen-centered organic radicals indicated the photoinduced electron transfer from the chemisorbed 4-chlorophenol... to the conduction band of TiO2. © 2019 Elsevier B.V.

Keywords:
TiO2 / 4-Chlorophenol / Charge transfer complex / EPR
Source:
Optical Materials, 2019, 89, 237-242
Funding / projects:
  • Programme for Funding Multilateral Scientific and Technological Cooperation Projects in the Danube Region (DS-2016-0016)
  • Slovak Research and Development Agency (No. DS-2016-0016)
  • Materials of Reduced Dimensions for Efficient Light Harvesting and Energy conversion (RS-45020)

DOI: 10.1016/j.optmat.2019.01.027

ISSN: 0925-3467

WoS: 000465509800033

Scopus: 2-s2.0-85060846949
[ Google Scholar ]
11
12
URI
https://linkinghub.elsevier.com/retrieve/pii/S0925346719300503
https://vinar.vin.bg.ac.rs/handle/123456789/8044
Collections
  • Radovi istraživača
Institution/Community
Vinča
TY  - JOUR
AU  - Barbierikova, Zuzana
AU  - Dvoranova, Dana
AU  - Brezova, Vlasta
AU  - Džunuzović, Enis S.
AU  - Sredojević, Dušan
AU  - Lazić, Vesna M.
AU  - Nedeljković, Jovan
PY  - 2019
UR  - https://linkinghub.elsevier.com/retrieve/pii/S0925346719300503
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/8044
AB  - The visible-light-responsive inorganic-organic hybrid was prepared by surface modification of commercial TiO2 powder (Degussa P25) with 4-chlorophenol (4-CP). The optical absorption of the hybrid material is red-shifted compared to unmodified TiO2 powder due to the surface charge transfer complex (CTC) formation. The experimental results are supported by the density functional theory (DFT) calculations of the corresponding model cluster. The calculated electronic excitation spectrum is in agreement with the measured reflection spectrum of surface-modified TiO2 powder with 4-CP. The paramagnetic species, generated in the unmodified and surface-modified TiO2 powders upon excitation with ultraviolet and visible light, were identified using low-temperature electron paramagnetic resonance (EPR) spectroscopy. The formation of trapped electrons (Ti(III) centers) and the persistent oxygen-centered organic radicals indicated the photoinduced electron transfer from the chemisorbed 4-chlorophenol to the conduction band of TiO2. © 2019 Elsevier B.V.
T2  - Optical Materials
T1  - Visible-light-responsive surface-modified TiO2 powder with 4-chlorophenol: A combined experimental and DFT study
VL  - 89
SP  - 237
EP  - 242
DO  - 10.1016/j.optmat.2019.01.027
ER  - 
@article{
author = "Barbierikova, Zuzana and Dvoranova, Dana and Brezova, Vlasta and Džunuzović, Enis S. and Sredojević, Dušan and Lazić, Vesna M. and Nedeljković, Jovan",
year = "2019",
abstract = "The visible-light-responsive inorganic-organic hybrid was prepared by surface modification of commercial TiO2 powder (Degussa P25) with 4-chlorophenol (4-CP). The optical absorption of the hybrid material is red-shifted compared to unmodified TiO2 powder due to the surface charge transfer complex (CTC) formation. The experimental results are supported by the density functional theory (DFT) calculations of the corresponding model cluster. The calculated electronic excitation spectrum is in agreement with the measured reflection spectrum of surface-modified TiO2 powder with 4-CP. The paramagnetic species, generated in the unmodified and surface-modified TiO2 powders upon excitation with ultraviolet and visible light, were identified using low-temperature electron paramagnetic resonance (EPR) spectroscopy. The formation of trapped electrons (Ti(III) centers) and the persistent oxygen-centered organic radicals indicated the photoinduced electron transfer from the chemisorbed 4-chlorophenol to the conduction band of TiO2. © 2019 Elsevier B.V.",
journal = "Optical Materials",
title = "Visible-light-responsive surface-modified TiO2 powder with 4-chlorophenol: A combined experimental and DFT study",
volume = "89",
pages = "237-242",
doi = "10.1016/j.optmat.2019.01.027"
}
Barbierikova, Z., Dvoranova, D., Brezova, V., Džunuzović, E. S., Sredojević, D., Lazić, V. M.,& Nedeljković, J.. (2019). Visible-light-responsive surface-modified TiO2 powder with 4-chlorophenol: A combined experimental and DFT study. in Optical Materials, 89, 237-242.
https://doi.org/10.1016/j.optmat.2019.01.027
Barbierikova Z, Dvoranova D, Brezova V, Džunuzović ES, Sredojević D, Lazić VM, Nedeljković J. Visible-light-responsive surface-modified TiO2 powder with 4-chlorophenol: A combined experimental and DFT study. in Optical Materials. 2019;89:237-242.
doi:10.1016/j.optmat.2019.01.027 .
Barbierikova, Zuzana, Dvoranova, Dana, Brezova, Vlasta, Džunuzović, Enis S., Sredojević, Dušan, Lazić, Vesna M., Nedeljković, Jovan, "Visible-light-responsive surface-modified TiO2 powder with 4-chlorophenol: A combined experimental and DFT study" in Optical Materials, 89 (2019):237-242,
https://doi.org/10.1016/j.optmat.2019.01.027 . .

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