Národní úložiště šedé literatury Nalezeno 136 záznamů.  začátekpředchozí115 - 124dalšíkonec  přejít na záznam: Hledání trvalo 0.00 vteřin. 
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.
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.
Optimized Doped Titania for Photocatalysis Applications
Krejčíková, Simona ; Kočí, K. ; Obalová, L. ; Čapek, L. ; Šolcová, Olga
This study is focused on preparation and characterization of the specially designed TIO2 and its modified versions (doped by metal) suitable for photodegradations of organic pollutants.
Plný text: Stáhnout plný textPDF
TiO2 and WO3 thin films: Characterization, adsorption and photocatalytic degradation of oxalic acid and methylene blue
Brüger, A. ; Hrazdira, D. ; Waldner, G. ; Krýsa, J. ; Jirkovský, Jaromír ; Vinek, H. ; Schlögl, R. ; Rupprechter, G.
The importance of wastewater treatment needs no explanation. Thin transparent TiO2 and WO3 layers have shown photocatalytic activity in the decomposition of water pollutants and are promissing candidates for wide-scale applications.
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.
Reaction order of photocatalytic degradation of various organic compounds
Krýsa, J. ; Waldner, G. ; Jirkovský, Jaromír ; Grabner, G.
The kinetic of photocatalytic degradation of four different model organic compounds, formic acid (FA), oxalic acid (OA), 4-chlorophenol (4-CP) and 3-(4-chlorophenyl)-1,1-dimethylurea (the herbicide monuron), on irradiated titanium dioxide was compared.
Surface complexation and charge transfer processes in colloidal semiconductors studied by laser flash photolysis
Grabner, G. ; Jirkovský, Jaromír
Aqueous colloidal solutions of quantum sized particles of TiO2 undergo an ageing process beginning with their preparation. In course of time, the mean size of nanoparticles is gradually increasing and some of their physico-chemical properties are changing as well. In the present study, the decrease of the spectral blue shift of the semiconductor absorption threshold was measured to determine the corresponding changes of band gap energy of the Q-TiO2 particles.
Determination of quantum yield of photocatalytic degradation in suspension and on thin film of titanium dioxide
Měšťánková, Hana ; Zita, J. ; Navrátil, K. ; Krýsa, J. ; Jirkovský, Jaromír
The development of novel photocatalytic materials based on nanocrystalline titanium dioxide is a rapidly growing field of science and technology. Parallel to the industrial production and practical use of these materials, simple but reliable procedures for the characterization of their photoactivity are necessary. The testing methods are usually based on relative comparison of the photoefficiency of a probe to a standard under certain conditions.
Příprava a charakterizace TiO2 filmů depozicí z kapalné fáze
Szatmáry, Lórant ; Šubrt, Jan ; Bezdička, Petr ; Jirkovský, Jaromír ; Kete, M. ; Štangar, U. L.
Cílem této práce bylo připravit vrstvy TiO2 při různých reakčních teplotách a zjistit vliv složení a teploty na fotokatalytickou aktivitu.
Test method for self cleaning performance
Peterka, F. ; Jirkovský, Jaromír ; Sťahel, P. ; Navrátil, Z. ; Buček, A.
The method for self cleaning performance is based on combination of both effects og photocatalytic function, which are ox/red reaction and surface hydrophilicity. When oleic acid, as organic material deposited on tested photocatalytic material is decomposed, surface is becoming hydrophilic.

Národní úložiště šedé literatury : Nalezeno 136 záznamů.   začátekpředchozí115 - 124dalšíkonec  přejít na záznam:
Chcete být upozorněni, pokud se objeví nové záznamy odpovídající tomuto dotazu?
Přihlásit se k odběru RSS.