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Optimalizace depozičních parametrů za účelem vytvoření fotokatalytických titanoxidových vrstev metodou PECVD
PEKÁREK, Michal
Cílem této diplomové práce je depozice titan oxidových vrstev metodou PECVD za pomoci vlastního PECVD reaktoru, sestaveného v budově Katedry aplikované fyziky a techniky. Dalším cílem je optimalizace parametrů depozice za cílem vytvoření fotokatalytických TiOx vrstev a srovnání těchto vrstev s dostupným výrobkem Degussa P25. Naměřené výsledky jsou v této práci prezentovány, diskutovány a odpovídají na otázku, zdali je možné metodou PECVD dosáhnout alespoň srovnatelných výsledků, jakých je dosaženo při tvorbě fotokatalytických vrstev pomocí výrobku Degussa P25.
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Catalytic and photocatalytic processes on 18O-labeled TiO2
Kavan, Ladislav ; Zukalová, Markéta ; Ferus, Martin ; Kürti, J. ; Koltai, J. ; Civiš, Svatopluk
18O-isotope labelled titania (anatase, rutile) was synthesized. The products were characterized by Raman spectra together with their quantum chemical modelling. The interaction with carbon dioxide was investigated using high-resolution FTIR spectroscopy, in dark and upon UV-excitation. The oxygen isotope exchange at the Ti18O2/C16O2 interface was elucidated. The C18O2 was formed as the dominating final product with a minor content of C16O18O. The rate of oxygen-isotope exchange is highly sensitive to the conditions of the titania pretreatment. The vacuum-annealed Ti18O2 at 450 C exhibited a very high spontaneous oxygen exchange activity with gaseous C16O2. A mechanism for the 18O/16O exchange process is discussed at the molecular level. The photocatalytic formation of methane, acetylene and C16O released from the Ti18O2 surface was triggered by an XeCl excimer laser irradiation.
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Application of photocatalysis on TiO2 for pesticide removal
Krýsa, J. ; Jirkovský, Jaromír
Pesticides contaminate surface water mainly by washing from fields and crop-plant and by wind during aerial spraying. They may discrupt biologic equilibrium in streams due to their toxic effect on biocenosis. They can also unfavorably influence the self-cleaning ability of water, its odour and taste. Surface water is still treated and distributed as drinking water to more than half of the population in the Czech Republic supplied from public water conduits.
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