Photocatalytic abatement of air pollutants: Focus on their interference in mixtures

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F23%3A00561808" target="_blank" >RIV/61388955:_____/23:00561808 - isvavai.cz</a>

Výsledek na webu

<a href="https://hdl.handle.net/11104/0334308" target="_blank" >https://hdl.handle.net/11104/0334308</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jphotochem.2022.114235" target="_blank" >10.1016/j.jphotochem.2022.114235</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Photocatalytic abatement of air pollutants: Focus on their interference in mixtures

Popis výsledku v původním jazyce

Up to now, the research has been mostly devoted to the photocatalytic removal of individual pollutants. As in real situations, the pollutants are always presented in a mixture, it is crucial to know whether there is some sort of interference, which can influence the efficiency of the whole photocatalytic degradation process. Here, we investigated the ability of two commercial coatings (binder-containing FN NANO®2 and binder-free AEROXIDE® TiO2 P25) to abate ozone, nitric oxide, and acetaldehyde separately and in their mixtures. Both photocatalysts effectively removed the pollutants present separately in the air stream, achieving conversions of 30–60 % (at an inlet concentration of 0.1 ppmv), even at the UV-A irradiation intensity as low as 0.05 mW cm−2. Furthermore, the use of binder-containing coating provided stable ozone conversions (30–40 %) in the full range of relative humidity, which is extraordinary in comparison with published data. The kinetic analysis indicates that the degradation mechanisms of nitric oxide, acetaldehyde, and ozone considerably differed. While for nitric oxide the reaction in the adsorbed state played a crucial role, for acetaldehyde and ozone that was marginal. Importantly, owing to the differences in degradation mechanisms, no mutual interference occurred when pollutant mixtures were treated. This finding is of major importance for the application of photocatalysis as environmental technology.

Název v anglickém jazyce

Photocatalytic abatement of air pollutants: Focus on their interference in mixtures

Popis výsledku anglicky

Up to now, the research has been mostly devoted to the photocatalytic removal of individual pollutants. As in real situations, the pollutants are always presented in a mixture, it is crucial to know whether there is some sort of interference, which can influence the efficiency of the whole photocatalytic degradation process. Here, we investigated the ability of two commercial coatings (binder-containing FN NANO®2 and binder-free AEROXIDE® TiO2 P25) to abate ozone, nitric oxide, and acetaldehyde separately and in their mixtures. Both photocatalysts effectively removed the pollutants present separately in the air stream, achieving conversions of 30–60 % (at an inlet concentration of 0.1 ppmv), even at the UV-A irradiation intensity as low as 0.05 mW cm−2. Furthermore, the use of binder-containing coating provided stable ozone conversions (30–40 %) in the full range of relative humidity, which is extraordinary in comparison with published data. The kinetic analysis indicates that the degradation mechanisms of nitric oxide, acetaldehyde, and ozone considerably differed. While for nitric oxide the reaction in the adsorbed state played a crucial role, for acetaldehyde and ozone that was marginal. Importantly, owing to the differences in degradation mechanisms, no mutual interference occurred when pollutant mixtures were treated. This finding is of major importance for the application of photocatalysis as environmental technology.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10403 - Physical chemistry

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

Journal of Photochemistry and Photobiology A-Chemistry

ISSN

1010-6030

e-ISSN

1873-2666

Svazek periodika

434

Číslo periodika v rámci svazku

JAN 2023

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

6

Strana od-do

114235

Kód UT WoS článku

000870209300004

EID výsledku v databázi Scopus

2-s2.0-85137395900