Jan 17, 2020   1:35 p.m. Nataša
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Bc. Tomáš Hajdu
Identification number: 77601
University e-mail: xhajdut [at] stuba.sk
 
1420T11  Technical Chemistry I-TCHEM
FCFT I-TCHEM-FCH den [term 3, year 2]
Master type of study, full-time, attendance method form
fyzikálna chémia, 2nd year of study / 3rd semester of study
Study group no.: 52

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Basic information

Basic information about a final thesis

Type of thesis: Bachelor thesis
Thesis title:EPR Study of TiO2-Bi2O3 Composite Photocatalysts
Written by (author): Bc. Tomáš Hajdu
Department: Department of Physical Chemistry (IPC FCFT)
Thesis supervisor: Ing. Zuzana Barbieriková, PhD.
Opponent:doc. Ing. Tomáš Mackuľak, PhD.
Final thesis progress:Final thesis was successfully defended.


Additional information

Additional information about the final thesis follows. Click on the language link to display the information in the desired language.

Language of final thesis:Slovak

Slovak        English

Title of the thesis:EPR Study of TiO2-Bi2O3 Composite Photocatalysts
Summary:The ability of a composite photocatalyst with a potential to form the reactive oxygen species under a visible light exposure has been studied. The composite was prepared by combining TiO2 nanorods with a β-Bi2O3 semiconductor or rather a (BiO)2CO3, in order to improve the separation of the photogenerated electron-hole pairs. The studied suspensions have been prepared either in water or dimethylsulfoxide and studied by EPR spin trapping technique during in situ photo-excitation by UVA or by visible light irradiation, the concentration of the detected spin adduct has been used to evaluate their photocatalytic activity. The synthesized composite nanoparticles indicated higher photocatalytic activity than the standard P25 TiO2 under the UVA and VIS irradiation. With the aim to determine the optimal ratio between titanium dioxide and bismuth(III) oxide, a series of measurements was carried out and the results confirmed the higher concentration of spin adducts and photocatalytic activity in composites with higher content of the bismuth(III) oxide. The formation of heterojunction positively influences the overall photocatalytic activity.
Key words:Composite photocatalysts, Bi2O3, EPR Spectroscopy, Spin Trapping Technique, TiO2

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