Immobilised particulate TiO2 catalysts for degradation of organics pollutants. Effect of layer thickness
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F05%3A00013701" target="_blank" >RIV/60461373:22310/05:00013701 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Immobilised particulate TiO2 catalysts for degradation of organics pollutants. Effect of layer thickness
Original language description
Particulate TiO2 layers of various thickness were prepared by sedimentation from suspension and investigated by SEM, UV-VIS spectroscopy, photocurrents and photodegradation rate measurement. In pure electrolyte (Na2SO4) the photocurrent reaches a maximumaround 0.5 #m and then rapidly decreases with increasing thickness. The explanation consists in the fact that with increasing layer thickness the average distance of photogenerated electrons and holes from back contact of electrode increases. This results in higher recombination and lower electron flux (photocurrent) to the back contact. In the presence of oxalic acid photocurrent is about one order higher than in Na2SO4 and it does not decrease with layer thickness. It can be attributed to the strongadsorption of oxalic acid, which is directly oxidized by holes. The stationary concentration of holes is thus very small and the probability that electron/hole pairs will recombine is much lower than in pure electrolyte and does not depen
Czech name
Nanesený částicový TiO2 katalyzátor pro degradaci organických škodlivin. Vliv tloušťky vrstvy
Czech description
Částicové TiO2 vrstvy o různé tloušťce byly připraveny sedimentací ze suspense a zkoumány metodou SEM, UV-VIS spectroskopie, měřením fotoproudů a rychlosti fotodegradace. V čistém elektrolytu (Na2SO4) dosahuje fotoproud maxima okolo 0.5 #m a pak rychle klesá s rosoucí tloušťkou. Vysvětlení spočívá ve skutečnosti, že rostoucí tloušťkou roste vzdálenost fotogenerovaných elektronů a děr od kovového kontaktu elektrody. To vede k vyšší rekombinaci a nižšímu toku elektronůt (fotoproudu) ke kovovému kontaktu elektrody. V přítomnosti kyseliny šťavelové je fotoproud asi o řád vyšší než v Na2SO4 a neklesá se vzrůstem tloušťky vrstvy. To může být přisouzeno silné adsorpci kyseliny šťavelové, která přímo oxidovaná dírami.
Classification
Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
CH - Nuclear and quantum chemistry, photo chemistry
OECD FORD branch
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Result continuities
Project
<a href="/en/project/GA104%2F02%2F0662" target="_blank" >GA104/02/0662: Application of advanced oxidation processes utilizing solar energy in combination with non-ionogenic selective sorption for water decontamination</a><br>
Continuities
Z - Vyzkumny zamer (s odkazem do CEZ)
Others
Publication year
2005
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Electrochimica Acta
ISSN
0013-4686
e-ISSN
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Volume of the periodical
50
Issue of the periodical within the volume
25-26
Country of publishing house
GB - UNITED KINGDOM
Number of pages
6
Pages from-to
5255-5260
UT code for WoS article
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EID of the result in the Scopus database
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