Ukotvené částicové fotokatalyzátory TiO2 pro degradaci organických škodlivin: Vliv tloušťky vrstvy

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F05%3A00085701" target="_blank" >RIV/61388955:_____/05:00085701 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Immobilized Particulate TiO2 Photocatalysts for Degradation of Organic Pollutants: Effect of Layer Thickness

Popis výsledku v původním jazyce

ParticulateTiO2 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 mand 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 resultsin 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 strong adsorption 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 ...

Název v anglickém jazyce

Immobilized Particulate TiO2 Photocatalysts for Degradation of Organic Pollutants: Effect of Layer Thickness

Popis výsledku anglicky

ParticulateTiO2 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 mand 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 resultsin 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 strong adsorption 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 ...

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CG - Elektrochemie

OECD FORD obor

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Projekt

<a href="/cs/project/GA104%2F02%2F0662" target="_blank" >GA104/02/0662: Aplikace pokročilých oxidačních procesů využívajících sluneční energii v kombinaci s neionogenní selektivní sorpcí při čištění vody</a><br>

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2005

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Electrochimica acta

ISSN

0013-4686

e-ISSN

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Svazek periodika

50

Číslo periodika v rámci svazku

25-26

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

6

Strana od-do

5255-5260

Kód UT WoS článku

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EID výsledku v databázi Scopus

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